PHP up to 5.4.43/5.5.27/5.6.11 SLP Unserialize ext/spl/spl_array.c 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 declared as critical. This affects an unknown part of the file ext/spl/spl_array.c of the component SLP Unserialize Handler. Such manipulation leads to use after free. This vulnerability is traded as CVE-2015-6832. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in PHP up to 5.4.43/5.5.27/5.6.11 (Programming Language Software). It has been rated as very critical. Affected by this issue is some unknown processing of the file ext/spl/spl_array.c of the component SLP Unserialize Handler. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Use-after-free vulnerability in the SPL unserialize implementation in ext/spl/spl_array.c in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allows remote attackers to execute arbitrary code via crafted serialized data that triggers misuse of an array field.

The weakness was shared 01/19/2016 (Website). The advisory is shared for download at bugs.php.net. This vulnerability is handled as CVE-2015-6832 since 09/08/2015. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/03/2022).

As 0-day the estimated underground price was around $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 vulnerability database at Tenable (86794). The entries VDB-3695, VDB-5786, VDB-5794 and VDB-9021 are related to this item. Once again VulDB remains the best source 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 🔍
11/08/2015 +61 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: 70068
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-6832 (🔍)
GCVE (CVE): GCVE-0-2015-6832
GCVE (VulDB): GCVE-100-80324
See also: 🔍

Entryinfo

Created: 01/20/2016 10:07
Updated: 07/03/2022 15:52
Changes: 01/20/2016 10:07 (54), 06/25/2018 09:14 (21), 07/03/2022 15:52 (3)
Complete: 🔍
Cache ID: 216:7A3:103

Once again VulDB remains the best source for vulnerability data.

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