CVE-2021-37623

Name	CVE-2021-37623
Description	Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. An infinite loop was found in Exiv2 versions v0.27.4 and earlier. The infinite loop is triggered when Exiv2 is used to modify the metadata of a crafted image file. An attacker could potentially exploit the vulnerability to cause a denial of service, if they can trick the victim into running Exiv2 on a crafted image file. Note that this bug is only triggered when deleting the IPTC data, which is a less frequently used Exiv2 operation that requires an extra command line option (`-d I rm`). The bug is fixed in version v0.27.5.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
exiv2 (PTS)	jessie, jessie (lts)	0.24-4.1+deb8u7	fixed
	stretch (security)	0.25-3.1+deb9u3	fixed
	stretch (lts), stretch	0.25-3.1+deb9u4	fixed
	buster	0.25-4+deb10u2	fixed
	buster (security)	0.25-4+deb10u4	fixed
	bullseye	0.27.3-3+deb11u2	fixed
	bullseye (security)	0.27.3-3+deb11u1	vulnerable
	sid, trixie, bookworm	0.27.6-1	fixed

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

Package	Type	Release	Fixed Version
exiv2	source	jessie	(not affected)
exiv2	source	stretch	(not affected)
exiv2	source	buster	(not affected)
exiv2	source	bullseye	0.27.3-3+deb11u2
exiv2	source	(unstable)	0.27.5-1

Notes

[buster] - exiv2 <not-affected> (relevant IPTC parsing added in 0.26)
https://github.com/Exiv2/exiv2/security/advisories/GHSA-mvc4-g5pv-4qqq
https://github.com/Exiv2/exiv2/pull/1790
[stretch] - exiv2 <not-affected> (relevant IPTC parsing added in 0.26)
[jessie] - exiv2 <not-affected> (relevant IPTC parsing added in 0.26)