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CVE-2020-6096

Status Candidate

Overview

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

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
MD5 | bf1be2fa5ed0acab1c981917d5b783b4
Gentoo Linux Security Advisory 202101-20
Posted Jan 25, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202101-20 - Multiple vulnerabilities have been found in glibc, the worst of which could result in the arbitrary execution of code. Versions less than 2.32-r5 are affected.

tags | advisory, arbitrary, vulnerability
systems | linux, gentoo
advisories | CVE-2016-10228, CVE-2020-1752, CVE-2020-29562, CVE-2020-29573, CVE-2020-6096
MD5 | 632615a63f7774ee12ee124904d92aec
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