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AUSCERT External Security Bulletin Redistribution
ESB-2021.2251
klibc security update
29 June 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: klibc
Publisher: Debian
Operating System: Debian GNU/Linux
Linux variants
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31873 CVE-2021-31872 CVE-2021-31871
CVE-2021-31870
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2021/06/msg00025.html
Comment: This advisory references vulnerabilities in products which run on
platforms other than Debian. It is recommended that administrators
running klibc check for an updated version of the software for their
operating system.
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Debian LTS Advisory DLA-2695-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Ben Hutchings
June 28, 2021 https://wiki.debian.org/LTS
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Package : klibc
Version : 2.0.4-9+deb9u1
CVE ID : CVE-2021-31870 CVE-2021-31871 CVE-2021-31872 CVE-2021-31873
Debian Bug : 989505
Several vulnerabilities have been discovered in klibc. Depending on
how klibc is used, these could lead to the execution of arbitrary
code, privilege escalation, or denial of service.
Thanks to Microsoft Vulnerability Research for reporting the heap bugs
and going some of the way to identifying the cpio bugs.
CVE-2021-31870
Multiplication in the calloc() function may result in an integer
overflow and a subsequent heap buffer overflow.
CVE-2021-31871
An integer overflow in the cpio command may result in a NULL
pointer dereference.
CVE-2021-31872
Multiple possible integer overflows in the cpio command on 32-bit
systems may result in a buffer overflow or other security impact.
CVE-2021-31873
Additions in malloc() function may result in integer overflow and
subsequent heap buffer overflow.
For Debian 9 stretch, these problems have been fixed in version
2.0.4-9+deb9u1.
We recommend that you upgrade your klibc packages.
For the detailed security status of klibc please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/klibc
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
- --
Ben Hutchings - Debian developer, member of kernel, installer and LTS teams
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