Debian LTS: DLA-2695-1: klibc security update
Summary
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/source-package/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