- double free due to subsequent call of realloc()     (CVE-2019-5481)

  - fix heap buffer overflow in function     tftp_receive_packet() (CVE-2019-5482)

----

  - avoid reporting spurious error in the HTTP2 framing     layer (#1690971)

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

According to the versions of the curl packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - curl is a command line tool for transferring data with     URL syntax, supporting FTP, FTPS, HTTP, HTTPS, SCP,     SFTP, TFTP, TELNET, DICT, LDAP, LDAPS, FILE, IMAP,     SMTP, POP3 and RTSP. curl supports SSL certificates,     HTTP POST, HTTP PUT, FTP uploading, HTTP form based     upload, proxies, cookies, user+password authentication     (Basic, Digest, NTLM, Negotiate, kerberos...), file     transfer resume, proxy tunneling and a busload of other     useful tricks. Security Fix(es):Heap buffer overflow in     the TFTP protocol handler in cURL 7.19.4 to     7.65.3.(CVE-2019-5482)This vulnerability has been     modified since it was last analyzed by the NVD. It is     awaiting reanalysis which may result in further changes     to the information provided.(CVE-2019-5481)

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.

This update for curl fixes the following issues :

Security issues fixed :

  - CVE-2019-5481: Fixed FTP-KRB double-free during kerberos     FTP data transfer (bsc#1149495).

  - CVE-2019-5482: Fixed TFTP small blocksize heap buffer     overflow (bsc#1149496).

This update was imported from the SUSE:SLE-15:Update update project.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2021:0078 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2019-3822:
    libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The     function creating an outgoing NTLM type-3 header     (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents     based on previously received data. The check that exists to prevent the local buffer from getting     overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from     happening. This output data can grow larger than the local buffer if very large 'nt response' data is     extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large     value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes     from the NTLMv2 type-2 response header.

    CVE-2019-3823:
    libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code     handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and     contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads     beyond the allocated buffer. The read contents will not be returned to the caller.

    CVE-2019-5436:
    A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl     versions 7.19.4 through 7.64.1.

    CVE-2019-5481:
    Double-free vulnerability in the FTP-kerberos code in cURL 7.52.0 to 7.65.3.

    CVE-2019-5482:
    Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.

    CVE-2020-8177:
    curl 7.20.0 through 7.70.0 is vulnerable to improper restriction of names for files and other resources     that can lead too overwriting a local file when the -J flag is used.

    CVE-2020-8231:
    Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending     data.

    CVE-2020-8284:
    A malicious server can use the FTP PASV response to trick curl 7.73.0 and earlier into connecting back to     a given IP address and port, and this way potentially make curl extract information about services that     are otherwise private and not disclosed, for example doing port scanning and service banner extractions.

    CVE-2020-8285:
    curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue     in FTP wildcard match parsing.

    CVE-2020-8286:
    curl 7.41.0 through 7.73.0 is vulnerable to an improper check for certificate revocation due to     insufficient verification of the OCSP response.

    CVE-2021-22946:
    A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an     IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL`     or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly     crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations
    **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear     text over the network.

    CVE-2021-22947:
    When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to     upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches.
    curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using     and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw,     it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS     traffic from the legitimate server and trick curl into sending data back to the user thinking the     attacker's injected data comes from the TLS-protected server.

Tenable has extracted the preceding description block directly from the Alibaba Cloud 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.

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2020:1792 advisory.

  - curl: TFTP receive heap buffer overflow in tftp_receive_packet() function (CVE-2019-5436)

  - curl: double free due to subsequent call of realloc() (CVE-2019-5481)

  - curl: heap buffer overflow in function tftp_receive_packet() (CVE-2019-5482)

Note that Nessus has not tested for this issue 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-2020-1792 advisory.

    - double free due to subsequent call of realloc() (CVE-2019-5481)
    - fix heap buffer overflow in function tftp_receive_packet() (CVE-2019-5482)

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.

このcurl用更新プログラムでは、以下の問題を修正します。修正されたセキュリティ問題：

キャッシュサイドチャネル攻撃の軽減：

CVE-2019-5481：kerberos FTPデータ転送中のFTP-KRBの二重解放を修正しました（bsc#1149495）。

CVE-2019-5482：TFTPの小さなブロックサイズのヒープバッファオーバーフローを修正（bsc#1149496）。

注意：Tenable Network Securityは、前述の記述ブロックをSUSEセキュリティアドバイザリから直接抽出しています。Tenableでは、そこに新しい問題を追加することはせずに、できる限り自動的に整理と書式設定をするようにしています。

このcurl用更新プログラムでは、以下の問題を修正します。修正されたセキュリティ問題：

キャッシュサイドチャネル攻撃の軽減：

  - CVE-2019-5481：kerberos FTPデータ転送中のFTP-KRBの二重解放を修正しました（bsc#1149495）。

  - CVE-2019-5482：TFTPの小さなブロックサイズのヒープバッファオーバーフローを修正（bsc#1149496）。

この更新はSUSEからインポートされました：SLE-15：更新プロジェクトを更新します。

- realloc()の後続呼び出しによる二重解放（CVE-2019-5481）

  - tftp_receive_packet()関数でのヒープバッファオーバーフローを修正します（CVE-2019-5482）

----

  - HTTP2フレーミングレイヤーで偽造のエラーが報告されないようにします（#1690971）

注意：Tenable Network Securityは、前述の記述ブロックをFedora更新システムのWebサイトから直接抽出しています。
Tenableでは、新たな問題を持ち込まずに、できる限り自動的に整理して書式設定するようにしています。

リモートのCentOS Linux 8ホストにインストールされているパッケージは、CESA-2020: 1792アドバイザリに記載されている脆弱性の影響を受けます。

  - curl：tftp_receive_packet()関数におけるTFTP受信ヒープバッファオーバーフロー（CVE-2019-5436）

  - curl：realloc()の後続呼び出しによる二重解放（CVE-2019-5481）

  - curl：tftp_receive_packet()関数でのヒープバッファオーバーフロー（CVE-2019-5482）

Nessusはこの問題をテストしておらず、代わりにアプリケーションの自己報告されたバージョン番号にのみ依存しています。

リモートの Oracle Linux 8 ホストに、ELSA-2020-1792 のアドバイザリに記載されている複数の脆弱性の影響を受けるパッケージがインストールされています。

  - cURL 7.19.4 〜 7.65.3 の TFTP プロトコルハンドラーのヒープバッファオーバーフロー。(CVE-2019-5482)

  - TFTP 受信コードのヒープバッファオーバーフローにより、7.19.4～7.64.1 の libcurl バージョンで DoS または任意のコード実行が発生する可能性があります。(CVE-2019-5436)

  - cURL 7.52.0 から 7.65.3 の FTP-kerberos コードでの二重解放の脆弱性。(CVE-2019-5481)

Nessus はこれらの問題をテストしておらず、代わりにアプリケーションの自己報告されたバージョン番号にのみ依存しています。

ID	名前	製品	ファミリー	公開日	更新日	深刻度
129626	Fedora 31 : curl (2019-6d7f6fa2c8)	Nessus	Fedora Local Security Checks	2019/10/7	2024/4/19	critical
132824	EulerOS Virtualization for ARM 64 3.0.5.0 : curl (EulerOS-SA-2020-1070)	Nessus	Huawei Local Security Checks	2020/1/13	2024/4/1	critical
128987	openSUSE Security Update : curl (openSUSE-2019-2149)	Nessus	SuSE Local Security Checks	2019/9/18	2024/4/24	critical
236591	Alibaba Cloud Linux 3 : 0078: curl (ALINUX3-SA-2021:0078)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/15	critical
146018	CentOS 8 : curl (CESA-2020:1792)	Nessus	CentOS Local Security Checks	2021/2/1	2024/1/24	critical
180880	Oracle Linux 8 : curl (ELSA-2020-1792)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2024/10/22	critical
128873	SUSE SLED15 / SLES15セキュリティ更新プログラム：curl（SUSE-SU-2019:2373-1）	Nessus	SuSE Local Security Checks	2019/9/16	2024/4/25	critical
128987	openSUSEセキュリティ更新プログラム：curl（openSUSE-2019-2149）	Nessus	SuSE Local Security Checks	2019/9/18	2024/4/24	critical
129626	Fedora 31：curl（2019-6d7f6fa2c8）	Nessus	Fedora Local Security Checks	2019/10/7	2024/4/19	critical
146018	CentOS 8：curl（CESA-2020: 1792）	Nessus	CentOS Local Security Checks	2021/2/1	2024/1/24	critical
180880	Oracle Linux 8: curl (ELSA-2020-1792)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2024/10/22	critical

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