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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2015-2327 from the MITRE CVE dictionary dictionary and NIST NVD.
| Base Score | 4.3 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:N/I:N/A:P |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Partial |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (pcre) | RHBA-2015:2142 | 2015-11-19 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (rh-php56-php) | RHSA-2016:2750 | 2016-11-15 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (rh-php56-php) | RHSA-2016:2750 | 2016-11-15 |
| Platform | Package | State |
|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-mariadb101-mariadb | Not affected |
| Red Hat Software Collections for Red Hat Enterprise Linux | php55-php | Will not fix |
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-mariadb100-mariadb | Not affected |
| Red Hat Software Collections for Red Hat Enterprise Linux | php54-php | Will not fix |
| Red Hat JBoss Web Server 3.0 | pcre | Will not fix |
| Red Hat JBoss EWS 2 | httpd | Not affected |
| Red Hat JBoss EWS 1 | httpd | Not affected |
| Red Hat Enterprise Linux 7 | virtuoso-opensource | Not affected |
| Red Hat Enterprise Linux 7 | glib2 | Will not fix |
| Red Hat Enterprise Linux 6 | pcre | Not affected |
| Red Hat Enterprise Linux 6 | glib2 | Will not fix |
| Red Hat Enterprise Linux 5 | pcre | Not affected |
| Red Hat Directory Server 8 | pcre | Not affected |
Vulmon