5 - RHSA-2016:2600

Problem Description:

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

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.

4. Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the squid service will be restarted automatically.

5. Bugs fixed (https://bugzilla.redhat.com/):

1254016 - IPv4 fallback is not working when connecting to a dualstack host with non-functional IPv6 1254018 - should BuildRequire: g++ 1299972 - squid file descriptor limit hardcoded to 16384 via compile option in spec file 1312257 - CVE-2016-2569 CVE-2016-2570 squid: some code paths fail to check bounds in string object 1312262 - CVE-2016-2571 CVE-2016-2572 squid: wrong error handling for malformed HTTP responses 1323594 - CVE-2016-3948 squid: denial of service issue in HTTP response processing 1330186 - digest doesn't properly work with squid 3.3 on CentOS 7 1336940 - Disable squid systemd unit start/stop timeouts