#VU87892 Data Handling in PCRE - CVE-2015-2328

Vulnerability identifier: #VU87892

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-2328

CWE-ID: CWE-19

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PCRE
Universal components / Libraries / Libraries used by multiple products

Vendor: PCRE

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to PCRE mishandles the /((?(R)a|(?1)))+/ pattern and related patterns with certain recursion. A remote attacker can cause a denial of service (segmentation fault) or possibly have unspecified other impact via a crafted regular expression.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

PCRE: before 8.36

---

External links
https://rhn.redhat.com/errata/RHSA-2016-1025.html
https://rhn.redhat.com/errata/RHSA-2016-2750.html
https://vcs.pcre.org/pcre/code/trunk/ChangeLog?view=markup
https://www.fortiguard.com/advisory/FG-VD-15-014/
https://www.openwall.com/lists/oss-security/2015/11/29/1
https://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
https://www.securityfocus.com/bid/74924
https://www-01.ibm.com/support/docview.wss?uid=isg3T1023886
https://bugs.exim.org/show_bug.cgi?id=1515
https://jira.mongodb.org/browse/SERVER-17252

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.