PHP Regex Memory information disclosure

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in PHP. It has been declared as problematic. This affects an unknown function of the component Regex Handler. Executing a manipulation can lead to information disclosure (Memory). No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in PHP (Programming Language Software) (version now known). It has been declared as critical. This vulnerability affects some unknown processing of the component Regex Handler. The manipulation with an unknown input leads to a information disclosure vulnerability (Memory). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 08/17/2015 as ZDI-15-394 as confirmed advisory (ZDI). The advisory is shared for download at zerodayinitiative.com. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592. The advisory points out:

The specific flaw exists within the handling of invalid regular expressions. The issue lies in the failure to properly initialize pointers in a buffer while executing a regular expression. An attacker can leverage this to disclose the contents of any address in memory in the context of the process running PHP.

The vulnerability was handled as a non-public zero-day exploit for at least 308 days. During that time the estimated underground price was around $5k-$25k.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at vcs.pcre.org.

The vulnerability is also documented in the vulnerability database at X-Force (105673). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Name: Memory
Class: Information disclosure / Memory
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven
Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: vcs.pcre.org

Timelineinfo

10/13/2014 🔍
08/17/2015 +308 days 🔍
08/18/2015 +1 days 🔍
10/15/2017 +789 days 🔍

Sourcesinfo

Product: php.org

Advisory: ZDI-15-394
Status: Confirmed

GCVE (VulDB): GCVE-100-77272
X-Force: 105673 - PHP regular expression information disclsoure

Entryinfo

Created: 08/18/2015 18:18
Updated: 10/15/2017 11:31
Changes: 08/18/2015 18:18 (43), 10/15/2017 11:31 (4)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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