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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
PHP Session Deserializer - Use-After-Free
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| php | php | 5.6.0 | |
| php | php | 5.6.1 | |
| php | php | 5.6.2 | |
| php | php | 5.6.3 | |
| php | php | 5.6.4 | |
| php | php | 5.6.5 | |
| php | php | 5.6.6 | |
| php | php | 5.6.7 | |
| php | php | 5.6.8 | |
| php | php | 5.6.9 | |
| php | php | 5.6.10 | |
| php | php | 5.6.11 | |
| php | php | 5.6.12 | |
| php | php | {"endIncluding":"5.4.44"} | |
| php | php | 5.5.0 | |
| php | php | 5.5.1 | |
| php | php | 5.5.2 | |
| php | php | 5.5.3 | |
| php | php | 5.5.4 | |
| php | php | 5.5.5 | |
| php | php | 5.5.6 | |
| php | php | 5.5.7 | |
| php | php | 5.5.8 | |
| php | php | 5.5.9 | |
| php | php | 5.5.10 | |
| php | php | 5.5.11 | |
| php | php | 5.5.12 | |
| php | php | 5.5.13 | |
| php | php | 5.5.14 | |
| php | php | 5.5.15 | |
| php | php | 5.5.16 | |
| php | php | 5.5.17 | |
| php | php | 5.5.18 | |
| php | php | 5.5.19 | |
| php | php | 5.5.20 | |
| php | php | 5.5.21 | |
| php | php | 5.5.22 | |
| php | php | 5.5.23 | |
| php | php | 5.5.24 | |
| php | php | 5.5.25 | |
| php | php | 5.5.26 | |
| php | php | 5.5.27 | |
| php | php | 5.5.28 | |
References
- 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
- 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
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.