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CVE-2009-5155

Status Candidate

Overview

In the GNU C Library (aka glibc or libc6) before 2.28, parse_reg_exp in posix/regcomp.c misparses alternatives, which allows attackers to cause a denial of service (assertion failure and application exit) or trigger an incorrect result by attempting a regular-expression match.

Related Files

Ubuntu Security Notice USN-4954-1
Posted May 14, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4954-1 - Jason Royes and Samuel Dytrych discovered that the memcpy implementation for 32 bit ARM processors in the GNU C Library contained an integer underflow vulnerability. An attacker could possibly use this to cause a denial of service or execute arbitrary code. It was discovered that the POSIX regex implementation in the GNU C Library did not properly parse alternatives. An attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary
systems | linux, osx, ubuntu
advisories | CVE-2009-5155, CVE-2020-6096
SHA-256 | 0d97bdfb094448b62a9b461045f71712af4a4388f17038f2bff95ef14f66f9a8
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