来自 Red Hat 安全公告 2016:2600： squid 的更新现在可用于 Red Hat Enterprise Linux 7。 Red Hat 产品安全团队将此更新评级为具有中等安全影响。可从“参考”部分中的 CVE 链接获取通用漏洞评分系统 (CVSS) 基本分数，其针对每个漏洞给出了详细的严重性等级。 Squid 是针对 Web 客户端的高性能代理缓存服务器，支持 FTP、Gopher 和 HTTP 数据对象。 下列程序包已升级到更新的上游版本： squid (3.5.20)。(BZ#1273942, BZ#1349775) 安全补丁： * 在 squid 处理 HTTP 响应中标头的方式中发现错误边界检查，从而可能导致断言失败。恶意 HTTP 服务器会利用此缺陷，借助特制的 HTTP 响应，使 squid 崩溃。(CVE-2016-2569, CVE-2016-2570) * 已发现当 HTTP 响应解析失败时，squid 未正确处理错误，可能导致断言失败。恶意 HTTP 服务器会利用此缺陷，借助特制的 HTTP 响应，使 squid 崩溃。(CVE-2016-2571, CVE-2016-2572) * 在 squid 处理 HTTP 响应中 Vary 标头的方式中发现错误边界检查，从而可能导致断言失败。恶意 HTTP 服务器会利用此缺陷，借助特制的 HTTP 响应，使 squid 崩溃。(CVE-2016-3948) 更多变更： 如需有关此发行版本的详细变更信息，请参阅可从“参考”部分链接的 Red Hat Enterprise Linux 7.3 版本说明。

向后移植的修补程序（针对 CVE-2016-2569）受制于失败的断言，可导致 squid3 在关闭连接时崩溃。其实，此 CVE 的补丁强烈依赖于 squid3 更高版本中的异常处理机制，而我在之前的更新中未能发现这一点。考虑到 Squeeze 用户应迁移到受支持的 Debian 版本，我已经将修补程序恢复原状以保证安全。此 EOL 事后更新的目的是在存档中保留一个功能正常的 squid3 程序包。

注意：Tenable Network Security 已直接从 DLA 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下尽可能进行了自动整理和排版。

此 squid3 更新修复了以下问题：

- pinger ICMP 处理过程存在多个问题。
 （CVE-2014-7141、CVE-2014-7142）

- CVE-2016-3947：pinger ICMPv6 处理过程中存在缓冲区溢出问题。(bsc#973782)

- CVE-2016-4554：修复 HTTP 请求处理过程中存在的标头走私问题 (bsc#979010)

- 修复 HTTP 响应处理过程中的多种拒绝服务问题。(CVE-2016-2569、CVE-2016-2570、CVE-2016-2571、CVE-2016-2572、bsc#968392、bsc#968393、bsc#968394、bsc#968395)

- 由上述 DoS 补丁造成的回归 (bsc#993299)

- CVE-2016-3948：修复 HTTP 响应处理过程中的拒绝服务问题 (bsc#973783)

- CVE-2016-4051：修复了 cachemgr.cgi 中的缓冲区溢出 (bsc#976553)

- CVE-2016-4052、CVE-2016-4053、CVE-2016-4054：

- 修复 ESI 处理过程中的多个问题 (bsc#976556)

- CVE-2016-4556：修复 Esi.cc 中的双重释放漏洞 (bsc#979008)

- CVE-2015-5400：不当保护替代路径 (bsc#938715)

- CVE-2014-6270：修复 snmp 子系统中的差一问题 (bsc#895773)

- 使用 external_acl 时 squid3 中发生内存泄漏 (bsc#976708)

请注意，Tenable Network Security 已直接从 SUSE 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下尽可能进行了自动整理和排版。

Mathias Fischer discovered that Squid incorrectly handled certain long strings in headers. A malicious remote server could possibly cause Squid to crash, resulting in a denial of service. This issue was only addressed in Ubuntu 16.04 LTS. (CVE-2016-2569)

William Lima discovered that Squid incorrectly handled XML parsing when processing Edge Side Includes (ESI). A malicious remote server could possibly cause Squid to crash, resulting in a denial of service.
This issue was only addressed in Ubuntu 16.04 LTS. (CVE-2016-2570)

Alex Rousskov discovered that Squid incorrectly handled response-parsing failures. A malicious remote server could possibly cause Squid to crash, resulting in a denial of service. This issue only applied to Ubuntu 16.04 LTS. (CVE-2016-2571)

Santiago Ruano Rincon discovered that Squid incorrectly handled certain Vary headers. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue was only addressed in Ubuntu 16.04 LTS. (CVE-2016-3948)

Louis Dion-Marcil discovered that Squid incorrectly handled certain Edge Side Includes (ESI) responses. A malicious remote server could possibly cause Squid to crash, resulting in a denial of service.
(CVE-2018-1000024)

Louis Dion-Marcil discovered that Squid incorrectly handled certain Edge Side Includes (ESI) responses. A malicious remote server could possibly cause Squid to crash, resulting in a denial of service.
(CVE-2018-1000027).

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

The remote host is affected by the vulnerability described in GLSA-201607-01 (Squid: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Squid. Please review       the CVE identifiers referenced below for details.
  Impact :

    An attacker can possibly execute arbitrary code or create a Denial of       Service condition.
  Workaround :

    There is no known workaround at this time.

The backported patch to solve CVE-2016-2569 yielded to failed assertions that made squid3 to crash when closing connections. The fix for this CVE strongly relies on exception handling present in more recent versions of squid3, that I failed to identify in the previous update. I have reverted the patch to take the safest position, taking into account that Squeeze users should migrate to a supported version of Debian. This post-EOL update is intended to keep a functional squid3 package in the archive.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA 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 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not     properly append data to String objects, which allows     remote servers to cause a denial of service (assertion     failure and daemon exit) via a long string, as     demonstrated by a crafted HTTP Vary     header.(CVE-2016-2569)

  - The Edge Side Includes (ESI) parser in Squid 3.x before     3.5.15 and 4.x before 4.0.7 does not check buffer     limits during XML parsing, which allows remote HTTP     servers to cause a denial of service (assertion failure     and daemon exit) via a crafted XML document, related to     esi/CustomParser.cc and     esi/CustomParser.h.(CVE-2016-2570)

  - http.cc in Squid 3.x before 3.5.15 and 4.x before 4.0.7     proceeds with the storage of certain data after a     response-parsing failure, which allows remote HTTP     servers to cause a denial of service (assertion failure     and daemon exit) via a malformed     response.(CVE-2016-2571)

  - http.cc in Squid 4.x before 4.0.7 relies on the HTTP     status code after a response-parsing failure, which     allows remote HTTP servers to cause a denial of service     (assertion failure and daemon exit) via a malformed     response.(CVE-2016-2572)

  - Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly     perform bounds checking, which allows remote attackers     to cause a denial of service via a crafted HTTP     response, related to Vary headers.(CVE-2016-3948)

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 squid3 fixes the following issues :

  - Multiple issues in pinger ICMP processing.
    (CVE-2014-7141, CVE-2014-7142)

  - CVE-2016-3947: Buffer overrun issue in pinger ICMPv6     processing. (bsc#973782)

  - CVE-2016-4554: fix header smuggling issue in HTTP     Request processing (bsc#979010)

  - Fix multiple Denial of Service issues in HTTP Response     processing. (CVE-2016-2569, CVE-2016-2570,     CVE-2016-2571, CVE-2016-2572, bsc#968392, bsc#968393,     bsc#968394, bsc#968395)

  - Regression caused by the DoS fixes above (bsc#993299)

  - CVE-2016-3948: Fix denial of service in HTTP Response     processing (bsc#973783)

  - CVE-2016-4051: fixes buffer overflow in cachemgr.cgi     (bsc#976553)

  - CVE-2016-4052, CVE-2016-4053, CVE-2016-4054 :

  - fixes multiple issues in ESI processing (bsc#976556)

  - CVE-2016-4556: fixes double free vulnerability in Esi.cc     (bsc#979008)

  - CVE-2015-5400: Improper Protection of Alternate Path     (bsc#938715)

  - CVE-2014-6270: fix off-by-one in snmp subsystem     (bsc#895773)

  - Memory leak in squid3 when using external_acl     (bsc#976708)

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.

From Red Hat Security Advisory 2016:2600 :

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

Red Hat Product Security has rated this update as having a security impact of Moderate. 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.

Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.

The following packages have been upgraded to a newer upstream version:
squid (3.5.20). (BZ#1273942, BZ#1349775)

Security Fix(es) :

* Incorrect boundary checks were found in the way squid handled headers in HTTP responses, which could lead to an assertion failure. A malicious HTTP server could use this flaw to crash squid using a specially crafted HTTP response. (CVE-2016-2569, CVE-2016-2570)

* It was found that squid did not properly handle errors when failing to parse an HTTP response, possibly leading to an assertion failure. A malicious HTTP server could use this flaw to crash squid using a specially crafted HTTP response. (CVE-2016-2571, CVE-2016-2572)

* An incorrect boundary check was found in the way squid handled the Vary header in HTTP responses, which could lead to an assertion failure. A malicious HTTP server could use this flaw to crash squid using a specially crafted HTTP response. (CVE-2016-3948)

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

Versions of Squid 3.5.x prior to 3.5.15 are affected by multiple vulnerabilities :

 - A flaw is triggered when performing improper bounds checks on specially crafted HTTP responses. This may allow a remote attacker to cause a denial of service. 
 - A flaw is triggered as bounds are not properly checked when processing HTTP responses. This may allow a remote attacker to cause a denial of service for all clients accessing the service.
 - An overflow condition exists in the 'Icmp6::Recv()' function in 'icmp/Icmp6.cc' of the pinger binary. The issue is triggered as user-supplied input is not properly validated when handling specially crafted ICMPv6 packets. This may allow a remote attacker to cause a buffer overflow, crashing the pinger process or potentially leaking data into log files.

ID	Name	Product	Family	Published	Updated	Severity
94719	Oracle Linux 7 : squid (ELSA-2016-2600)	Nessus	Oracle Linux Local Security Checks	11/11/2016	1/14/2021	high
89045	Debian DLA-445-2：squid3 回归更新	Nessus	Debian Local Security Checks	3/1/2016	1/11/2021	high
93294	SUSE SLES11 安全更新：squid3 (SUSE-SU-2016:2089-1)	Nessus	SuSE Local Security Checks	9/2/2016	1/19/2021	high
106619	Ubuntu 14.04 LTS / 16.04 LTS : Squid vulnerabilities (USN-3557-1)	Nessus	Ubuntu Local Security Checks	2/6/2018	10/20/2023	high
91982	GLSA-201607-01 : Squid: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	7/11/2016	1/11/2021	high
89045	Debian DLA-445-2 : squid3 regression update	Nessus	Debian Local Security Checks	3/1/2016	1/11/2021	high
99818	EulerOS 2.0 SP1 : squid (EulerOS-SA-2016-1056)	Nessus	Huawei Local Security Checks	5/1/2017	1/6/2021	high
93294	SUSE SLES11 Security Update : squid3 (SUSE-SU-2016:2089-1)	Nessus	SuSE Local Security Checks	9/2/2016	1/19/2021	high
94719	Oracle Linux 7 : squid (ELSA-2016-2600)	Nessus	Oracle Linux Local Security Checks	11/11/2016	1/14/2021	high
9774	Squid 3.5.x < 3.5.15 Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	11/11/2016	3/6/2019	medium

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