CVE-2023-40548

Name	CVE-2023-40548
Description	A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3813-1
Debian Bugs	1061519

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
shim (PTS)	bullseye	15.8-1~deb11u1	fixed
	bookworm	15.8-1~deb12u1	fixed
	forky, sid, trixie	15.8-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
shim	source	buster	15.8-1~deb10u1	DLA-3813-1
shim	source	bullseye	15.8-1~deb11u1
shim	source	bookworm	15.8-1~deb12u1
shim	source	(unstable)	15.8-1		1061519

https://bugzilla.redhat.com/show_bug.cgi?id=2241782
https://github.com/rhboot/shim/commit/96dccc255b16e9465dbee50b3cef6b3db74d11c8 (15.8)