CVE-2021-29623

Name	CVE-2021-29623
Description	Exiv2 is a C++ library and a command-line utility to read, write, delete and modify Exif, IPTC, XMP and ICC image metadata. A read of uninitialized memory was found in Exiv2 versions v0.27.3 and earlier. Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. The read of uninitialized memory is triggered when Exiv2 is used to read the metadata of a crafted image file. An attacker could potentially exploit the vulnerability to leak a few bytes of stack memory, if they can trick the victim into running Exiv2 on a crafted image file. The bug is fixed in version v0.27.4.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs	988481

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
exiv2 (PTS)	buster	0.25-4+deb10u2	fixed
	buster (security)	0.25-4+deb10u4	fixed
	bullseye (security), bullseye	0.27.3-3+deb11u1	vulnerable
	bookworm, sid	0.27.6-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
exiv2	source	buster	(not affected)
exiv2	source	(unstable)	0.27.5-1			988481

Notes

[bullseye] - exiv2 <no-dsa> (Minor issue)
[buster] - exiv2 <not-affected> (webpimage support added 0.26)
https://github.com/Exiv2/exiv2/security/advisories/GHSA-6253-qjwm-3q4v
https://github.com/Exiv2/exiv2/pull/1627