CVE-2020-6096

 

Published at: - 02-04-2020 12:15

Last modified: - 21-11-2022 08:39

Total changes: - 9

Description

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://sourceware.org/bugzilla/show_bug.cgi?id=25620
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1019
• FEDORA-2020-d860479b2a-Mailing List, Third Party Advisory
• FEDORA-2020-4e92a61688-Mailing List, Third Party Advisory
• GLSA-202101-20-Third Party Advisory
• [mina-dev] 20210225 [jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jar-Mailing List, Third Party Advisory
• [debian-lts-announce] 20221017 [SECURITY] [DLA 3152-1] glibc security update-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2020-6096

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures