The AES-NI implementation in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h does not consider memory allocation during a certain padding check, which allows remote attackers to obtain sensitive cleartext information via a padding-oracle attack against an AES CBC session, NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-0169. (CVE-2016-2107)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-3556 advisory.

    - fix CVE-2016-2105 - possible overflow in base64 encoding
    - fix CVE-2016-2106 - possible overflow in EVP_EncryptUpdate()
    - fix CVE-2016-2107 - padding oracle in stitched AES-NI CBC-MAC
    - fix CVE-2016-2108 - memory corruption in ASN.1 encoder
    - fix CVE-2016-2109 - possible DoS when reading ASN.1 data from BIO
    - fix CVE-2016-0799 - memory issues in BIO_printf
    - fix CVE-2016-0702 - side channel attack on modular exponentiation
    - fix CVE-2016-0705 - double-free in DSA private key parsing
    - fix CVE-2016-0797 - heap corruption in BN_hex2bn and BN_dec2bn
    - fix CVE-2015-3197 - SSLv2 ciphersuite enforcement
    - fix CVE-2015-7575 - disallow use of MD5 in TLS1.2
    - fix CVE-2015-3194 - certificate verify crash with missing PSS parameter
    - fix CVE-2015-3195 - X509_ATTRIBUTE memory leak

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

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

Several vulnerabilities were discovered in OpenSSL, a Secure Socket Layer toolkit.

  - CVE-2016-2105     Guido Vranken discovered that an overflow can occur in     the function EVP_EncodeUpdate(), used for Base64     encoding, if an attacker can supply a large amount of     data. This could lead to a heap corruption.

  - CVE-2016-2106     Guido Vranken discovered that an overflow can occur in     the function EVP_EncryptUpdate() if an attacker can     supply a large amount of data. This could lead to a heap     corruption.

  - CVE-2016-2107     Juraj Somorovsky discovered a padding oracle in the AES     CBC cipher implementation based on the AES-NI     instruction set. This could allow an attacker to decrypt     TLS traffic encrypted with one of the cipher suites     based on AES CBC.

  - CVE-2016-2108     David Benjamin from Google discovered that two separate     bugs in the ASN.1 encoder, related to handling of     negative zero integer values and large universal tags,     could lead to an out-of-bounds write.

  - CVE-2016-2109     Brian Carpenter discovered that when ASN.1 data is read     from a BIO using functions such as d2i_CMS_bio(), a     short invalid encoding can cause allocation of large     amounts of memory potentially consuming excessive     resources or exhausting memory.

Additional information about these issues can be found in the OpenSSL security advisory at https://www.openssl.org/news/secadv/20160503.txt

An update for openssl is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es) :

* A flaw was found in the way OpenSSL encoded certain ASN.1 data structures. An attacker could use this flaw to create a specially crafted certificate which, when verified or re-encoded by OpenSSL, could cause it to crash, or execute arbitrary code using the permissions of the user running an application compiled against the OpenSSL library. (CVE-2016-2108)

* Two integer overflow flaws, leading to buffer overflows, were found in the way the EVP_EncodeUpdate() and EVP_EncryptUpdate() functions of OpenSSL parsed very large amounts of input data. A remote attacker could use these flaws to crash an application using OpenSSL or, possibly, execute arbitrary code with the permissions of the user running that application. (CVE-2016-2105, CVE-2016-2106)

* It was discovered that OpenSSL leaked timing information when decrypting TLS/SSL and DTLS protocol encrypted records when the connection used the AES CBC cipher suite and the server supported AES-NI. A remote attacker could possibly use this flaw to retrieve plain text from encrypted packets by using a TLS/SSL or DTLS server as a padding oracle. (CVE-2016-2107)

* Several flaws were found in the way BIO_*printf functions were implemented in OpenSSL. Applications which passed large amounts of untrusted data through these functions could crash or potentially execute code with the permissions of the user running such an application. (CVE-2016-0799, CVE-2016-2842)

* A denial of service flaw was found in the way OpenSSL parsed certain ASN.1-encoded data from BIO (OpenSSL's I/O abstraction) inputs. An application using OpenSSL that accepts untrusted ASN.1 BIO input could be forced to allocate an excessive amount of data. (CVE-2016-2109)

Red Hat would like to thank the OpenSSL project for reporting CVE-2016-2108, CVE-2016-2842, CVE-2016-2105, CVE-2016-2106, CVE-2016-2107, and CVE-2016-0799. Upstream acknowledges Huzaifa Sidhpurwala (Red Hat), Hanno Bock, and David Benjamin (Google) as the original reporters of CVE-2016-2108; Guido Vranken as the original reporter of CVE-2016-2842, CVE-2016-2105, CVE-2016-2106, and CVE-2016-0799; and Juraj Somorovsky as the original reporter of CVE-2016-2107.

Security Fix(es) :

  - A flaw was found in the way OpenSSL encoded certain     ASN.1 data structures. An attacker could use this flaw     to create a specially crafted certificate which, when     verified or re-encoded by OpenSSL, could cause it to     crash, or execute arbitrary code using the permissions     of the user running an application compiled against the     OpenSSL library. (CVE-2016-2108)

  - Two integer overflow flaws, leading to buffer overflows,     were found in the way the EVP_EncodeUpdate() and     EVP_EncryptUpdate() functions of OpenSSL parsed very     large amounts of input data. A remote attacker could use     these flaws to crash an application using OpenSSL or,     possibly, execute arbitrary code with the permissions of     the user running that application. (CVE-2016-2105,     CVE-2016-2106)

  - It was discovered that OpenSSL leaked timing information     when decrypting TLS/SSL and DTLS protocol encrypted     records when the connection used the AES CBC cipher     suite and the server supported AES-NI. A remote attacker     could possibly use this flaw to retrieve plain text from     encrypted packets by using a TLS/SSL or DTLS server as a     padding oracle. (CVE-2016-2107)

  - Several flaws were found in the way BIO_*printf     functions were implemented in OpenSSL. Applications     which passed large amounts of untrusted data through     these functions could crash or potentially execute code     with the permissions of the user running such an     application. (CVE-2016-0799, CVE-2016-2842)

  - A denial of service flaw was found in the way OpenSSL     parsed certain ASN.1-encoded data from BIO (OpenSSL's     I/O abstraction) inputs. An application using OpenSSL     that accepts untrusted ASN.1 BIO input could be forced     to allocate an excessive amount of data. (CVE-2016-2109)

Security fix for CVE-2016-2108, CVE-2016-2107, CVE-2016-2105, CVE-2016-2106

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

The remote OracleVM system is missing necessary patches to address critical security updates :

  - fix CVE-2016-2177 - possible integer overflow

  - fix CVE-2016-2178 - non-constant time DSA operations

  - fix CVE-2016-2179 - further DoS issues in DTLS

  - fix CVE-2016-2180 - OOB read in TS_OBJ_print_bio

  - fix CVE-2016-2181 - DTLS1 replay protection and     unprocessed records issue

  - fix CVE-2016-2182 - possible buffer overflow in     BN_bn2dec

  - fix CVE-2016-6302 - insufficient TLS session ticket HMAC     length check

  - fix CVE-2016-6304 - unbound memory growth with OCSP     status request

  - fix CVE-2016-6306 - certificate message OOB reads

  - mitigate CVE-2016-2183 - degrade all 64bit block ciphers     and RC4 to 112 bit effective strength

  - replace expired testing certificates

  - fix CVE-2016-2105 - possible overflow in base64 encoding

  - fix CVE-2016-2106 - possible overflow in     EVP_EncryptUpdate

  - fix CVE-2016-2107 - padding oracle in stitched AES-NI     CBC-MAC

  - fix CVE-2016-2108 - memory corruption in ASN.1 encoder

  - fix CVE-2016-2109 - possible DoS when reading ASN.1 data     from BIO

  - fix CVE-2016-0799 - memory issues in BIO_printf

The Oracle VM VirtualBox application installed on the remote host is a version prior to 5.0.22. It is, therefore, affected by multiple vulnerabilities in the bundled OpenSSL component :

  - A heap buffer overflow condition exists in the     EVP_EncodeUpdate() function within file     crypto/evp/encode.c that is triggered when handling     a large amount of input data. An unauthenticated, remote     attacker can exploit this to cause a denial of service     condition. (CVE-2016-2105)

  - A heap buffer overflow condition exists in the     EVP_EncryptUpdate() function within file     crypto/evp/evp_enc.c that is triggered when handling a     large amount of input data after a previous call occurs     to the same function with a partial block. An     unauthenticated, remote attacker can exploit this to     cause a denial of service condition. (CVE-2016-2106)

  - Flaws exist in the aesni_cbc_hmac_sha1_cipher()     function in file crypto/evp/e_aes_cbc_hmac_sha1.c and     the aesni_cbc_hmac_sha256_cipher() function in file     crypto/evp/e_aes_cbc_hmac_sha256.c that are triggered     when the connection uses an AES-CBC cipher and AES-NI     is supported by the server. A man-in-the-middle attacker     can exploit these to conduct a padding oracle attack,     resulting in the ability to decrypt the network traffic.
    (CVE-2016-2107)

  - Multiple unspecified flaws exist in the d2i BIO     functions when reading ASN.1 data from a BIO due to     invalid encoding causing a large allocation of memory.
    An unauthenticated, remote attacker can exploit these to     cause a denial of service condition through resource     exhaustion. (CVE-2016-2109)

  - An out-of-bounds read error exists in the     X509_NAME_oneline() function within file     crypto/x509/x509_obj.c when handling very long ASN1     strings. An unauthenticated, remote attacker can exploit     this to disclose the contents of stack memory.
    (CVE-2016-2176)

According to its self-reported version, the Oracle iPlanet Web Server (formerly known as Sun Java System Web Server) running on the remote host is 7.0.x prior to 7.0.27 Patch 26834070. It is, therefore, affected by an unspecified vulnerability in the Network Security Services (NSS) library with unknown impact.

According to its self-reported version number, the version of Splunk Enterprise hosted on the remote web server is 5.0.x, 6.0.x prior to 6.0.12, 6.1.x prior to 6.1.11, 6.2.x prior to 6.2.11, 6.3.x prior to 6.3.6, or 6.4.x prior to 6.4.2; or else it is Splunk Light version 6.4.x prior to 6.4.2. It is, therefore, affected by the following vulnerabilities :

  - An integer signedness error exists in libarchive in the     archive_write_zip_data() function within file     archive_write_set_format_zip.c due to improper     conversion between unsigned and signed integer types     when running on 64-bit CPUs. An unauthenticated, remote     attacker can exploit this to cause a buffer overflow,     resulting in a denial of service condition.
    (CVE-2013-0211)

  - A path traversal vulnerability exists in libarchive in     the bsdcpio() function within file in cpio/cpio.c due to     improper sanitization of user-supplied input. An     unauthenticated, remote attacker can exploit this, via     a specially crafted path in an archive, to write to     arbitrary files. (CVE-2015-2304)

  - A heap-based buffer overflow condition exists in     libarchive in the zip_read_mac_metadata() function     within file archive_read_support_format_zip.c due to     improper sanitization of user-supplied input. An     unauthenticated, remote attacker can exploit this, via     specially crafted entry-size values in a ZIP archive, to     cause a denial of service condition or the execution of     arbitrary code. (CVE-2016-1541)

  - Multiple flaws exist in the OpenSSL library in the     aesni_cbc_hmac_sha1_cipher() function in file     crypto/evp/e_aes_cbc_hmac_sha1.c and the     aesni_cbc_hmac_sha256_cipher() function in file     crypto/evp/e_aes_cbc_hmac_sha256.c that are triggered     when the connection uses an AES-CBC cipher and AES-NI     is supported by the server. A man-in-the-middle attacker     can exploit these to conduct a padding oracle attack,     resulting in the ability to decrypt the network traffic.
    (CVE-2016-2107)

  - An unspecified cross-site scripting (XSS) vulnerability     exists due to improper validation of user-supplied     input. An unauthenticated, remote attacker can exploit     this, via a specially crafted request, to execute     arbitrary script code in the user's browser session.

  - An unspecified cross-site redirection vulnerability     exists due to improper validation of user-supplied     input. An unauthenticated, remote attacker can exploit     this, by convincing a user to visit a specially crafted     web link, to redirect the browser to an arbitrary     website of the attacker's own choosing.

Note that Splunk Enterprise 5.0.x will not be patched for OpenSSL issues, and it is recommended you upgrade to the latest version.

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
94986	F5 Networks BIG-IP : OpenSSL vulnerability (K93600123)	Nessus	F5 Networks Local Security Checks	2016/11/21	2026/10/21	medium
181111	Oracle Linux 7 : openssl (ELSA-2016-3556)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2026/2/9	critical
90896	Debian DSA-3566-1 : openssl - security update	Nessus	Debian Local Security Checks	2016/5/5	2021/1/11	critical
91033	RHEL 7 : openssl (RHSA-2016:0722)	Nessus	Red Hat Local Security Checks	2016/5/11	2019/10/24	critical
91041	Scientific Linux Security Update : openssl on SL7.x x86_64 (20160509)	Nessus	Scientific Linux Local Security Checks	2016/5/11	2021/1/14	critical
91058	Fedora 22 : openssl-1.0.1k-15.fc22 (2016-1e39d934ed)	Nessus	Fedora Local Security Checks	2016/5/12	2021/1/11	critical
93761	OracleVM 3.3 / 3.4 : openssl (OVMSA-2016-0135)	Nessus	OracleVM Local Security Checks	2016/9/28	2026/1/23	critical
92458	Oracle VM VirtualBox < 5.0.22 Multiple Vulnerabilities (July 2016 CPU)	Nessus	Misc.	2016/7/20	2026/5/5	high
106349	Oracle iPlanet Web Server 7.0.x < 7.0.27 NSS Unspecified Vulnerability (January 2018 CPU)	Nessus	Web Servers	2018/1/25	2023/4/25	critical
92790	Splunk Enterprise < 5.0.16 / 6.0.12 / 6.1.11 / 6.2.11 / 6.3.6 / 6.4.2 or Splunk Light < 6.4.2 Multiple Vulnerabilities	Nessus	CGI abuses	2016/8/8	2026/1/29	high

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