PHP up to 5.4.43/5.5.27/5.6.11 SPL ArrayObject/SplObjectStorage/SplDoublyLinkedList use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability was found in PHP up to 5.4.43/5.5.27/5.6.11. It has been classified as critical. Affected by this issue is the function ArrayObject/SplObjectStorage/SplDoublyLinkedList of the component SPL. This manipulation causes use after free. This vulnerability appears as CVE-2015-6831. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in PHP up to 5.4.43/5.5.27/5.6.11 (Programming Language Software). It has been declared as very critical. Affected by this vulnerability is the function ArrayObject/SplObjectStorage/SplDoublyLinkedList of the component SPL. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented 01/19/2016 (Website). It is possible to read the advisory at bugs.php.net. This vulnerability is known as CVE-2015-6831 since 09/08/2015. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/03/2022).

We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 86794 (Debian DLA-341-1 : php5 security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 11629 (PHP Versions Prior to 5.6.12/5.5.28/5.4.44 Multiple Vulnerabilities).

Upgrading to version 5.4.44, 5.5.28 or 5.6.12 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (86794) and SecurityFocus (BID 76737†). See VDB-3695, VDB-5786, VDB-5794 and VDB-9021 for similar entries. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.6
VulDB Meta Temp Score: 8.4

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 86794
Nessus Name: Debian DLA-341-1 : php5 security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 103043
OpenVAS Name: PHP Multiple Vulnerabilities - 01 - Mar16 (Windows)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: PHP 5.4.44/5.5.28/5.6.12

Timelineinfo

09/08/2015 🔍
09/09/2015 +1 days 🔍
11/08/2015 +60 days 🔍
11/09/2015 +1 days 🔍
01/19/2016 +71 days 🔍
01/19/2016 +0 days 🔍
01/20/2016 +1 days 🔍
07/03/2022 +2356 days 🔍

Sourcesinfo

Product: php.org

Advisory: 70155
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-6831 (🔍)
GCVE (CVE): GCVE-0-2015-6831
GCVE (VulDB): GCVE-100-80323
SecurityFocus: 76737 - PHP CVE-2015-6831 Multiple Use After Free Remote Code Execution Vulnerabilities

See also: 🔍

Entryinfo

Created: 01/20/2016 10:07
Updated: 07/03/2022 15:46
Changes: 01/20/2016 10:07 (55), 06/21/2018 09:05 (24), 07/03/2022 15:46 (3)
Complete: 🔍
Cache ID: 216:0E0:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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