Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2015-6831

Use After Free

Published: Jan 19, 2016 | Modified: Apr 12, 2025
CVSS 3.x
7.3
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
6.8 MODERATE
AV:N/AC:M/Au:N/C:P/I:P/A:P
RedHat/V3
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2015-6831
CWEhttps://cwe.mitre.org/data/definitions/416.html

Multiple use-after-free vulnerabilities in SPL in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allow remote attackers to execute arbitrary code via vectors involving (1) ArrayObject, (2) SplObjectStorage, and (3) SplDoublyLinkedList, which are mishandled during unserialization.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

NameVendorStart VersionEnd Version
PhpPhp*5.4.44 (excluding)
PhpPhp5.5.0 (including)5.5.28 (excluding)
PhpPhp5.6.0 (including)5.6.12 (excluding)
Red Hat Software Collections for Red Hat Enterprise Linux 6RedHatrh-php56-php-0:5.6.5-8.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUSRedHatrh-php56-php-0:5.6.5-8.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSRedHatrh-php56-php-0:5.6.5-8.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHatrh-php56-php-0:5.6.5-8.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUSRedHatrh-php56-php-0:5.6.5-8.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUSRedHatrh-php56-php-0:5.6.5-8.el7*
Php5Ubuntudevel*
Php5Ubuntuesm-infra-legacy/trusty*
Php5Ubuntuprecise*
Php5Ubuntutrusty*
Php5Ubuntutrusty/esm*
Php5Ubuntuupstream*
Php5Ubuntuvivid*

Potential Mitigations

References

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