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Debian LTS Advisory DLA-2614-1                [email protected]
https://www.debian.org/lts/security/                      Markus Koschany
April 01, 2021                                https://wiki.debian.org/LTS
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Package        : busybox
Version        : 1:1.22.0-19+deb9u2
CVE ID         : CVE-2021-28831
Debian Bug     : 986217

The gunzip decompressor of Busybox, tiny utilities for small and embedded
systems, mishandled the error bit on the huft_build result pointer, with a
resultant invalid free or segmentation fault, via malformed gzip data. 

For Debian 9 stretch, this problem has been fixed in version
1:1.22.0-19+deb9u2.

We recommend that you upgrade your busybox packages.

For the detailed security status of busybox please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/busybox

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