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CVE-2020-6096

Published: 1 April 2020

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.

Priority

Low

Cvss 3 Severity Score

8.1

Score breakdown

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

upstream Needs triage

xenial Does not exist

impish Does not exist

groovy Does not exist

trusty Needed

hirsute Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

glibc
Launchpad, Ubuntu, Debian
eoan Ignored
(end of life)
trusty Does not exist

impish
Released (2.32-0ubuntu3)
groovy
Released (2.32-0ubuntu3)
bionic
Released (2.27-3ubuntu1.5)
focal
Released (2.31-0ubuntu9.7)
upstream Pending
(2.32)
xenial
Released (2.23-0ubuntu11.3)
hirsute
Released (2.32-0ubuntu3)
jammy
Released (2.32-0ubuntu3)
kinetic
Released (2.32-0ubuntu3)
lunar
Released (2.32-0ubuntu3)
mantic
Released (2.32-0ubuntu3)
Patches:
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eec0f4218cda936a6ab8f543e90b96b196df3fc2 (test)
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eca1b233322914d9013f3ee4aabecaadc9245abd (test)
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=79a4fa341b8a89cb03f84564fd72abaa1a2db394
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=beea361050728138b82c57dda0c4810402d342b9
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7b5f02dc2a9278cd068a58a3db3644e24707be49 (test)

Severity score breakdown

Parameter Value
Base score 8.1
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H