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Unscored Public exploit CVE-2015-6835 EUVD-2015-6771GHSA-5qpr-hcf2-vwc2

The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, …

Published May 16, 2016 · Updated Aug 6, 2024 · Assigned by microfocus

Package: php5 Ecosystem: Ubuntu

Description

The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 8 php5 5.6.13+dfsg-0+deb8u1 DSA-3358-1
Debian 7 php5 5.4.45-0+deb7u1 DSA-3358-1

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 14.04 LTS php5 5.5.9+dfsg-1ubuntu4.13 USN-2758-1

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
RHEL 2 rh-php56-php +27 5.6.5-8.el6 RHSA-2016:0457

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 12 php5 5.5.14-36.1 SUSE-SU-2015:1633-1

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

Exploit-DB 1

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 6

References