CVE-2015-6835

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.

9.8

CVSS

Severity: Critical

CVSS 3.0 •

CVSS 2.0 •

EPSS 22.00% Top 5%

Vendor Advisory debian.org Vendor Advisory gentoo.org

Affected: n/a n/a

References

Link	Tags
http://www.securityfocus.com/bid/76734	vdb entry
https://bugs.php.net/bug.php?id=70219
http://www.securitytracker.com/id/1033548	vdb entry
http://php.net/ChangeLog-5.php
http://www.debian.org/security/2015/dsa-3358	vendor advisory
https://security.gentoo.org/glsa/201606-10	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2015-6835?: CVE-2015-6835 has been scored as a critical severity vulnerability.
How to fix CVE-2015-6835?: To fix CVE-2015-6835, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-6835 being actively exploited in the wild?: It is possible that CVE-2015-6835 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~22% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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