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.

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.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3557-1 advisory.

    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 Rincn 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)

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

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

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.

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.

The specific version of Squid that the system is running is reportedly affected by the following vulnerabilities:

- Squid contains an overflow condition 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. (CVE-2016-3947)

- Squid contains a flaw that 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. (CVE-2016-3948)

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
99818	EulerOS 2.0 SP1 : squid (EulerOS-SA-2016-1056)	Nessus	Huawei Local Security Checks	5/1/2017	1/6/2021	high
106619	Ubuntu 14.04 LTS / 16.04 LTS : Squid vulnerabilities (USN-3557-1)	Nessus	Ubuntu Local Security Checks	2/6/2018	8/27/2024	high
93294	SUSE SLES11 Security Update : squid3 (SUSE-SU-2016:2089-1)	Nessus	SuSE Local Security Checks	9/2/2016	1/19/2021	high
9774	Squid 3.5.x < 3.5.15 Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	11/11/2016	3/6/2019	medium
802030	Squid 3.x < 3.5.16, 4.0.x < 4.0.8 Multiple Vulnerabilities	Log Correlation Engine	Web Servers	10/31/2016		high

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