Vulnerability Details : CVE-2015-6835
Potential exploit
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.
Vulnerability category: Memory CorruptionExecute codeDenial of service
Products affected by CVE-2015-6835
- cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:alpha1:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:alpha2:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:alpha4:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:alpha6:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:beta1:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:beta2:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:beta3:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:alpha3:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:alpha5:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:beta4:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.5:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.6:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.1:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.3:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.2:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.4:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.0:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:alpha4:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:alpha5:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:beta2:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:alpha2:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:alpha3:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.11:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.12:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.2:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.7:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.8:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.9:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:alpha1:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.1:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.10:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.5:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.6:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:beta1:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:beta3:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.0:beta4:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.3:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.6.4:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.8:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.7:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.11:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.10:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.9:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.12:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.13:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.15:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.14:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.16:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.17:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.18:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.19:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.20:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.21:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.26:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.25:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.22:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.28:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.27:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.24:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:5.5.23:*:*:*:*:*:*:*
Threat overview for CVE-2015-6835
Top countries where our scanners detected CVE-2015-6835
Top open port discovered on systems with this issue
80
IPs affected by CVE-2015-6835 550,424
Threat actors abusing to this issue?
Yes
Find out if you* are
affected by CVE-2015-6835!
*Directly or indirectly through your vendors, service providers and 3rd parties.
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attack surface intelligence
from SecurityScorecard.
Exploit prediction scoring system (EPSS) score for CVE-2015-6835
20.13%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 95 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2015-6835
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
References for CVE-2015-6835
-
https://bugs.php.net/bug.php?id=70219
PHP :: Sec Bug #70219 :: Use after free vulnerability in session deserializer
-
https://security.gentoo.org/glsa/201606-10
PHP: Multiple vulnerabilities (GLSA 201606-10) — Gentoo security
-
http://www.debian.org/security/2015/dsa-3358
Debian -- Security Information -- DSA-3358-1 php5
-
http://www.securitytracker.com/id/1033548
PHP Multiple Bugs Let Remote Users Obtain Potentially Sensitive Information, View Files, and Execute Arbitrary Code - SecurityTracker
-
http://www.securityfocus.com/bid/76734
PHP 'php_var_unserialize()' Function Use After Free Remote Code Execution Vulnerability
-
http://php.net/ChangeLog-5.php
PHP: PHP 5 ChangeLog
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