CVE-2015-2327 Denial of service in n/a

High 7.5 Published 2 Dec 2015 Updated 6 Aug 2024

Remote attackers can cause a denial of service via crafted regular expressions in the PCRE library, affecting applications that process untrusted regex patterns.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2015-2327?

CVE-2015-2327 is a high-severity denial of service vulnerability in n/a, published on 2 Dec 2015. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-119

Which versions are affected by CVE-2015-2327?

It affects 1 product.

Linux distribution packages (20)

`pcre` Red Hat:enterprise_linux:7::client	All versions	`0:8.32-15.el7`
`pcre-debuginfo` Red Hat:enterprise_linux:7::client	All versions	`0:8.32-15.el7`
`pcre-devel` Red Hat:enterprise_linux:7::client	All versions	`0:8.32-15.el7`
`pcre-static` Red Hat:enterprise_linux:7::client	All versions	`0:8.32-15.el7`
`pcre-tools` Red Hat:enterprise_linux:7::client	All versions	`0:8.32-15.el7`
`pcre` Red Hat:enterprise_linux:7::computenode	All versions	`0:8.32-15.el7`
`pcre-debuginfo` Red Hat:enterprise_linux:7::computenode	All versions	`0:8.32-15.el7`
`pcre-devel` Red Hat:enterprise_linux:7::computenode	All versions	`0:8.32-15.el7`
`pcre-static` Red Hat:enterprise_linux:7::computenode	All versions	`0:8.32-15.el7`
`pcre-tools` Red Hat:enterprise_linux:7::computenode	All versions	`0:8.32-15.el7`
`pcre` Red Hat:enterprise_linux:7::server	All versions	`0:8.32-15.el7`
`pcre-debuginfo` Red Hat:enterprise_linux:7::server	All versions	`0:8.32-15.el7`
`pcre-devel` Red Hat:enterprise_linux:7::server	All versions	`0:8.32-15.el7`
`pcre-static` Red Hat:enterprise_linux:7::server	All versions	`0:8.32-15.el7`
`pcre-tools` Red Hat:enterprise_linux:7::server	All versions	`0:8.32-15.el7`
`pcre` Red Hat:enterprise_linux:7::workstation	All versions	`0:8.32-15.el7`
`pcre-debuginfo` Red Hat:enterprise_linux:7::workstation	All versions	`0:8.32-15.el7`
`pcre-devel` Red Hat:enterprise_linux:7::workstation	All versions	`0:8.32-15.el7`
`pcre-static` Red Hat:enterprise_linux:7::workstation	All versions	`0:8.32-15.el7`
`pcre-tools` Red Hat:enterprise_linux:7::workstation	All versions	`0:8.32-15.el7`

Products include Pcre Perl Compatible Regular Expression Library.

How do I fix CVE-2015-2327?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2015-2327 being exploited?

There is no known exploitation of CVE-2015-2327 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2015-2327, GHSA-hvfc-r626-888m, RHBA-2015:2142, UBUNTU-CVE-2015-2327.