SB2016051114 - Red Hat Enterprise Linux 7 update for pcre
Published: May 11, 2016 Updated: April 24, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 secuirty vulnerabilities.
1) Data Handling (CVE-ID: CVE-2015-2328)
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.
2) Stack-based buffer overflow (CVE-ID: CVE-2015-3217)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing a crafted regular expression, as demonstrated by /^(?:(?(1)\.|([^\\W_])?)+)+$/. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
3) Heap-based buffer overflow (CVE-ID: CVE-2015-5073)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in Heap-based buffer overflow in the find_fixedlength function in pcre_compile.c in PCRE before 8.38. A remote attacker can use a crafted regular expression with an excess closing parenthesis. to trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
4) Buffer overflow (CVE-ID: CVE-2015-8385)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to PCRE mishandles the /(?|(k'Pm')|(?'Pm'))/ pattern and related patterns with certain forward references. A remote attacker can create a specially crafted Office document, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
5) Buffer overflow (CVE-ID: CVE-2015-8386)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing regular expressions. A remote attacker can trigger memory corruption using a JavaScript RegExp object and execute arbitrary code on the target system.
6) Buffer overflow (CVE-ID: CVE-2015-8388)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to PCRE mishandles the /(?=di(?<=(?1))|(?=(.))))/ pattern and related patterns with an unmatched closing parenthesis. A remote attacker can cause a denial of service (buffer overflow) or possibly have unspecified other impact via a crafted regular expression.
7) Buffer overflow (CVE-ID: CVE-2015-8391)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due pcre_compile function in pcre_compile.c in PCRE mishandles certain [: nesting. A remote attacker can cause a denial of service (CPU consumption) or possibly have unspecified other impact via a crafted regular expression.
8) Stack-based buffer overflow (CVE-ID: CVE-2016-3191)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the compile_branch function in pcre_compile.c in PCRE 8.x before 8.39 and pcre2_compile.c in PCRE2 before 10.22 mishandles patterns containing an (*ACCEPT) substring when processing a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror, aka ZDI-CAN-3542. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install update from vendor's website.