PT-2021-4576 · Klibc+4 · Klibc+4

Ben Hutchings · Published 2021-04-28 · Updated 2022-04-26 · CVE-2021-31870

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions klibc versions prior to 2.0.9

Description An issue in the calloc() function may result in an integer overflow and a subsequent heap buffer overflow. This could allow a remote attacker to access confidential data, compromise its integrity, and cause a denial of service.

Recommendations For versions prior to 2.0.9, update to version 2.0.9 or later to resolve the issue. As a temporary workaround, consider restricting the use of the calloc() function until a patch is available.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

ALT-PU-2021-1803

ALT-PU-2022-1761

BDU:2021-05247

CVE-2021-31870

DLA-2695-1

USN-5379-1

Affected Products

Alt Linux

Astra Linux

Linuxmint

Ubuntu

Klibc

References · 25

• https://ubuntu.com/security/CVE-2021-31872 · Vendor Advisory
• https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=292650f04c2b5348b4efbad61fb014ed09b4f3f2 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-31870 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/678242 · Security Note
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2021-1126SE17 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/682249 · Security Note
• https://osv.dev/vulnerability/CVE-2021-31870 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-31870 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2695-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31873 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20211008SE16 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-31870 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-31870 · Security Note
• https://ubuntu.com/security/notices/USN-5379-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-31871 · Vendor Advisory