This update for squid to version 4.10 fixes the following issues :

Security issues fixed :

CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).

CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).

CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).

CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).

Non-security issue fixed: Improved cache handling with chunked responses.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the squid package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An issue was discovered in Squid before 4.10. It allows     a crafted FTP server to trigger disclosure of sensitive     information from heap memory, such as information     associated with other users' sessions or non-Squid     processes.(CVE-2019-12528)

  - An issue was discovered in Squid before 4.10. Due to     incorrect input validation, the NTLM authentication     credentials parser in ext_lm_group_acl may write to     memory outside the credentials buffer. On systems with     memory access protections, this can result in the     helper process being terminated unexpectedly. This     leads to the Squid process also terminating and a     denial of service for all clients using the     proxy.(CVE-2020-8517)

  - An issue was discovered in Squid before 4.10. Due to     incorrect input validation, it can interpret crafted     HTTP requests in unexpected ways to access server     resources prohibited by earlier security     filters.(CVE-2020-8449)

  - An issue was discovered in Squid before 4.10. Due to     incorrect buffer management, a remote client can cause     a buffer overflow in a Squid instance acting as a     reverse proxy.(CVE-2020-8450)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the squid package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An issue was discovered in Squid before 4.10. Due to     incorrect input validation, it can interpret crafted     HTTP requests in unexpected ways to access server     resources prohibited by earlier security     filters.(CVE-2020-8449)

  - An issue was discovered in Squid before 4.10. Due to     incorrect buffer management, a remote client can cause     a buffer overflow in a Squid instance acting as a     reverse proxy.(CVE-2020-8450)

  - An issue was discovered in Squid before 4.10. Due to     incorrect input validation, the NTLM authentication     credentials parser in ext_lm_group_acl may write to     memory outside the credentials buffer. On systems with     memory access protections, this can result in the     helper process being terminated unexpectedly. This     leads to the Squid process also terminating and a     denial of service for all clients using the     proxy.(CVE-2020-8517)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Security Fix(es) :

  - squid: HTTP Request Smuggling could result in cache     poisoning (CVE-2020-15810)

  - squid: HTTP Request Splitting could result in cache     poisoning (CVE-2020-15811)

  - squid: Information Disclosure issue in FTP Gateway     (CVE-2019-12528)

  - squid: Improper input validation issues in HTTP Request     processing (CVE-2020-8449)

  - squid: Buffer overflow in reverse-proxy configurations     (CVE-2020-8450)

  - squid: Request smuggling and poisoning attack against     the HTTP cache (CVE-2020-15049)

  - squid: Improper input validation could result in a DoS     (CVE-2020-24606)

The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:4082 advisory.

  - An issue was discovered in Squid before 4.10. It allows a crafted FTP server to trigger disclosure of     sensitive information from heap memory, such as information associated with other users' sessions or non-     Squid processes. (CVE-2019-12528)

  - An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A     Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP     request with a Content-Length header containing +\ - or an uncommon shell whitespace character prefix     to the length field-value. (CVE-2020-15049)

  - An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP     Request Smuggling attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This     allows any client, including browser scripts, to bypass local security and poison the proxy cache and any     downstream caches with content from an arbitrary source. When configured for relaxed header parsing (the     default), Squid relays headers containing whitespace characters to upstream servers. When this occurs as a     prefix to a Content-Length header, the frame length specified will be ignored by Squid (allowing for a     conflicting length to be used from another Content-Length header) but relayed upstream. (CVE-2020-15810)

  - An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP     Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This     allows any client, including browser scripts, to bypass local security and poison the browser cache and     any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing     the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request     inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request     delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any     downstream caches. (CVE-2020-15811)

  - Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all     available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when     cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply()     livelocking in peer_digest.cc mishandles EOF. (CVE-2020-24606)

  - An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted     HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.
    (CVE-2020-8449)

  - An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can     cause a buffer overflow in a Squid instance acting as a reverse proxy. (CVE-2020-8450)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2020-558:03 advisory.

    * squid: HTTP Request Smuggling could result in cache poisoning (CVE-2020-15810)
      * squid: HTTP Request Splitting could result in cache poisoning (CVE-2020-15811)
      * squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)
      * squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)
      * squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)
      * squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)
      * squid: Improper input validation could result in a DoS (CVE-2020-24606)     CVE-2019-12528     An issue was discovered in Squid before 4.10. It allows a crafted FTP server to trigger disclosure of     sensitive information from heap memory, such as information associated with other users' sessions or non-     Squid processes.
    CVE-2020-15049     An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A     Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP     request with a Content-Length header containing +\ - or an uncommon shell whitespace character prefix     to the length field-value.
    CVE-2020-15810     An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP     Request Smuggling attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This     allows any client, including browser scripts, to bypass local security and poison the proxy cache and any     downstream caches with content from an arbitrary source. When configured for relaxed header parsing (the     default), Squid relays headers containing whitespace characters to upstream servers. When this occurs as a     prefix to a Content-Length header, the frame length specified will be ignored by Squid (allowing for a     conflicting length to be used from another Content-Length header) but relayed upstream.
    CVE-2020-15811     An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP     Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This     allows any client, including browser scripts, to bypass local security and poison the browser cache and     any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing     the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request     inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request     delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any     downstream caches.
    CVE-2020-24606     Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all     available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when     cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply()     livelocking in peer_digest.cc mishandles EOF.
    CVE-2020-8449     An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted     HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.
    CVE-2020-8450     An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can     cause a buffer overflow in a Squid instance acting as a reverse proxy.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-4743 advisory.

  - An issue was discovered in Squid before 4.10. It allows a crafted FTP server to trigger disclosure of     sensitive information from heap memory, such as information associated with other users' sessions or non-     Squid processes. (CVE-2019-12528)

  - An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can     cause a buffer overflow in a Squid instance acting as a reverse proxy. (CVE-2020-8450)

  - An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A     Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP     request with a Content-Length header containing +\ - or an uncommon shell whitespace character prefix     to the length field-value. (CVE-2020-15049)

  - Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all     available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when     cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply()     livelocking in peer_digest.cc mishandles EOF. (CVE-2020-24606)

  - An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted     HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.
    (CVE-2020-8449)

  - An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in     ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is     parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this     buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same     structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.
    (CVE-2019-12521)

  - An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is     made. This HTTP request doesn't go through the access checks that incoming HTTP requests go through. This     causes all access checks to be bypassed and allows access to restricted HTTP servers, e.g., an attacker     can connect to HTTP servers that only listen on localhost. (CVE-2019-12523)

  - An issue was discovered in Squid through 4.7. When handling requests from users, Squid checks its rules to     see if the request should be denied. Squid by default comes with rules to block access to the Cache     Manager, which serves detailed server information meant for the maintainer. This rule is implemented via     url_regex. The handler for url_regex rules URL decodes an incoming request. This allows an attacker to     encode their URL to bypass the url_regex check, and gain access to the blocked resource. (CVE-2019-12524)

  - An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based     buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to     ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in     the heap. (CVE-2019-12526)

  - An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When     Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode.
    uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The     length is then used to start decoding the string. There are no checks to ensure that the length it     calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An     attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the     display of usernames on error pages. (CVE-2019-12529)

  - Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter     to cachemgr.cgi. (CVE-2019-18860)

  - An issue was discovered in Squid before 4.12 and 5.x before 5.0.3. Due to use of a potentially dangerous     function, Squid and the default certificate validation helper are vulnerable to a Denial of Service when     opening a TLS connection to an attacker-controlled server for HTTPS. This occurs because unrecognized     error values are mapped to NULL, but later code expects that each error value is mapped to a valid error     string. (CVE-2020-14058)

  - An issue was discovered in Squid through 4.7 and 5. When receiving a request, Squid checks its cache to     see if it can serve up a response. It does this by making a MD5 hash of the absolute URL of the request.
    If found, it servers the request. The absolute URL can include the decoded UserInfo (username and     password) for certain protocols. This decoded info is prepended to the domain. This allows an attacker to     provide a username that has special characters to delimit the domain, and treat the rest of the URL as a     path or query string. An attacker could first make a request to their domain using an encoded username,     then when a request for the target domain comes in that decodes to the exact URL, it will serve the     attacker's HTML instead of the real HTML. On Squid servers that also act as reverse proxies, this allows     an attacker to gain access to features that only reverse proxies can use, such as ESI. (CVE-2019-12520)

  - Due to incorrect string termination, Squid cachemgr.cgi 4.0 through 4.7 may access unallocated memory. On     systems with memory access protections, this can cause the CGI process to terminate unexpectedly,     resulting in a denial of service for all clients using it. (CVE-2019-12854)

  - An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a     heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity     is high due to this vulnerability occurring before normal security checks; any remote client that can     reach the proxy port can trivially perform the attack via a crafted URI scheme. (CVE-2019-18676)

  - An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because     the appended characters do not properly interact with hostname length restrictions). Due to incorrect     message processing, it can inappropriately redirect traffic to origins it should not be delivered to.
    (CVE-2019-18677)

  - An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests     through frontend software to a Squid instance that splits the HTTP Request pipeline differently. The     resulting Response messages corrupt caches (between a client and Squid) with attacker-controlled content     at arbitrary URLs. Effects are isolated to software between the attacker client and Squid. There are no     effects on Squid itself, nor on any upstream servers. The issue is related to a request header containing     whitespace between a header name and a colon. (CVE-2019-18678)

  - An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is     vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the     raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR     protections and may aid attackers isolating memory areas to target for remote code execution attacks.
    (CVE-2019-18679)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2021-1405:01 advisory.

    * squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520)
      * squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521)
      * squid: Improper input validation in URI processor (CVE-2019-12523)
      * squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524)
      * squid: Heap overflow issue in URN processing (CVE-2019-12526)
      * squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)
      * squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529)
      * squid: Denial of service in cachemgr.cgi (CVE-2019-12854)
      * squid: Buffer overflow in URI processor (CVE-2019-18676)
      * squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677)
      * squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678)
      * squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679)
      * squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour     (CVE-2019-18860)
      * squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)
      * squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)
      * squid: DoS in TLS handshake (CVE-2020-14058)
      * squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)
      * squid: Improper input validation could result in a DoS (CVE-2020-24606)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名前	製品	ファミリー	公開日	更新日	深刻度
134099	SUSE SLES12 Security Update : squid (SUSE-SU-2020:0487-1)	Nessus	SuSE Local Security Checks	2020/2/27	2022/5/18	high
134103	SUSE SLES15 Security Update : squid (SUSE-SU-2020:0493-1)	Nessus	SuSE Local Security Checks	2020/2/27	2022/5/18	high
134817	EulerOS 2.0 SP5 : squid (EulerOS-SA-2020-1326)	Nessus	Huawei Local Security Checks	2020/3/23	2022/5/18	high
136869	EulerOS 2.0 SP8 : squid (EulerOS-SA-2020-1591)	Nessus	Huawei Local Security Checks	2020/5/26	2022/5/13	high
141708	Scientific Linux Security Update : squid on SL7.x x86_64 (20201001)	Nessus	Scientific Linux Local Security Checks	2020/10/21	2024/2/14	high
142599	CentOS 7 : squid (RHSA-2020:4082)	Nessus	CentOS Local Security Checks	2020/11/6	2024/10/9	high
293854	MiracleLinux 7 : squid-3.5.20-17.el7.4 (AXSA:2020-558:03)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
180917	Oracle Linux 8 : squid:4 (ELSA-2020-4743)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2023/9/7	critical
293924	MiracleLinux 8 : squid:4 (AXSA:2021-1405:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	critical

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