Updated Squid3 packages are available for both Debian 7 LTS and Debian 8:

[DLA 556-1] squid3 security update
[DSA 3625-1] squid3 security update

[DLA 556-1] squid3 security update

Package : squid3
Version : 3.1.20-2.2+deb7u6
CVE ID : CVE-2016-4051


A buffer overflow in the Squid 3's cache manager, identified by the
CVE-2016-4051, was addressed by the DLA-478-1 and the Debian package
version 3.1.20-2.2+deb7u6. However, the fix was incomplete and thus a
new upload has been needed.

For Debian 7 "Wheezy", this problem has been fixed in version
3.1.20-2.2+deb7u6.

We recommend that you upgrade your squid3 packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

[DSA 3625-1] squid3 security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-3625-1 security@debian.org
https://www.debian.org/security/ Sebastien Delafond
July 22, 2016 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : squid3
CVE ID : CVE-2016-4051 CVE-2016-4052 CVE-2016-4053 CVE-2016-4054
CVE-2016-4554 CVE-2016-4555 CVE-2016-4556
Debian Bug : 823968

Several security issues have been discovered in the Squid caching proxy.

CVE-2016-4051:

CESG and Yuriy M. Kaminskiy discovered that Squid cachemgr.cgi was
vulnerable to a buffer overflow when processing remotely supplied
inputs relayed through Squid.

CVE-2016-4052:

CESG discovered that a buffer overflow made Squid vulnerable to a
Denial of Service (DoS) attack when processing ESI responses.

CVE-2016-4053:

CESG found that Squid was vulnerable to public information
disclosure of the server stack layout when processing ESI responses.

CVE-2016-4054:

CESG discovered that Squid was vulnerable to remote code execution
when processing ESI responses.

CVE-2016-4554:

Jianjun Chen found that Squid was vulnerable to a header smuggling
attack that could lead to cache poisoning and to bypass of
same-origin security policy in Squid and some client browsers.

CVE-2016-4555, CVE-2016-4556:

"bfek-18" and "@vftable" found that Squid was vulnerable to a Denial
of Service (DoS) attack when processing ESI responses, due to
incorrect pointer handling and reference counting.

For the stable distribution (jessie), these problems have been fixed in
version 3.4.8-6+deb8u3.

For the testing (stretch) and unstable (sid) distributions, these
problems have been fixed in version 3.5.19-1.

We recommend that you upgrade your squid3 packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/