CVE-2015-2327

pcre: infinite recursion compiling pattern with zero-repeated groups that include recursive back reference (8.36/19)

Severity Score

10.0

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

PCRE before 8.36 mishandles the /(((a\2)|(a*)\g<-1>))*/ pattern and related patterns with certain internal recursive back references, which allows remote attackers to cause a denial of service (segmentation fault) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.

PCRE en versiones anteriores a 8.36 no maneja correctamente el patrón /(((a\2)|(a*)\g<-1>))*/ y patrones relacionados con ciertas referencias hacia atrás recursivas internas, lo que permite a atacantes remotos causar una denegación de servicio (fallo de segmentación) o posiblemente tener otro impacto no especificado a través de una expresión regular manipulada, según lo demostrado por un objeto JavaScript RegExp encontrado por Konqueror.

PHP is an HTML-embedded scripting language commonly used with the Apache HTTP Server. The rh-php56 packages provide a recent stable release of PHP with PEAR 1.9.5 and enhanced language features including constant expressions, variadic functions, arguments unpacking, and the interactive debuger. The memcache, mongo, and XDebug extensions are also included. The rh-php56 Software Collection has been upgraded to version 5.6.25, which provides a number of bug fixes and enhancements over the previous version. Security Fixes in the rh-php56-php component have been added.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-03-18 CVE Reserved
2015-12-02 CVE Published
2024-08-06 CVE Updated
2024-08-06 First Exploit
2025-04-08 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-674: Uncontrolled Recursion

CAPEC

References (9)

URL	Tag	Source
http://www.fortiguard.com/advisory/FG-VD-15-010	X_refsource_misc
http://www.openwall.com/lists/oss-security/2015/11/29/1	Mailing List
http://www.securityfocus.com/bid/74924	Vdb Entry
https://jira.mongodb.org/browse/SERVER-17252	X_refsource_confirm

URL	Date	SRC
http://vcs.pcre.org/pcre/code/trunk/ChangeLog?view=markup	2024-08-06
https://bugs.exim.org/show_bug.cgi?id=1503	2024-08-06

URL	Date	SRC

URL	Date	SRC
http://rhn.redhat.com/errata/RHSA-2016-2750.html	2018-01-05
https://access.redhat.com/security/cve/CVE-2015-2327	2016-11-15
https://bugzilla.redhat.com/show_bug.cgi?id=1285408	2016-11-15

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Pcre Search vendor "Pcre"		Perl Compatible Regular Expression Library Search vendor "Pcre" for product "Perl Compatible Regular Expression Library"				<= 8.35 Search vendor "Pcre" for product "Perl Compatible Regular Expression Library" and version " <= 8.35"		-		Affected