CVE-2015-6835
CRITICAL severity · CVSS 9.8
9.8CVSS CRITICAL
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)23%
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://php.net/ChangeLog-5.php
- http://www.debian.org/security/2015/dsa-3358
- http://www.securityfocus.com/bid/76734
- http://www.securitytracker.com/id/1033548
- https://bugs.php.net/bug.php?id=70219
- https://security.gentoo.org/glsa/201606-10
- http://php.net/ChangeLog-5.php
- http://www.debian.org/security/2015/dsa-3358