Debian 9: DLA-2695-1 Moderate Security Issue with Klibc Exploit Risk

debian lts

June 28, 2021

Several vulnerabilities have been discovered in klibc

Topics Covered

security advisory moderate code execution debian privilege escalation DoS klibc

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