Integer overflow in klibc - CVE-2021-31870
Published: April 19, 2022
Vulnerability identifier: #VU62375
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2021-31870
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: git.kernel.org
Affected software:
klibc
klibc
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow in the calloc() function. A remote attacker can pass specially crafted data to the application, trigger integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2021-31870
Install updates from vendor's website.
Sources
- https://kernel.org/pub/linux/libs/klibc/2.0/
- https://lists.zytor.com/archives/klibc/2021-April/004593.html
- https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=292650f04c2b5348b4efbad61fb014ed09b4f3f2
- http://www.openwall.com/lists/oss-security/2021/04/30/1
- https://lists.debian.org/debian-lts-announce/2021/06/msg00025.html