CVE-2021-32617

Name	CVE-2021-32617
Description	Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. An inefficient algorithm (quadratic complexity) was found in Exiv2 versions v0.27.3 and earlier. The inefficient algorithm is triggered when Exiv2 is used to write metadata into 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. The bug is fixed in version v0.27.4. Note that this bug is only triggered when _writing_ the metadata, which is a less frequently used Exiv2 operation than _reading_ the metadata. For example, to trigger the bug in the Exiv2 command-line application, you need to add an extra command-line argument such as `rm`.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	988731

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	vulnerable
	stretch (security)	0.25-3.1+deb9u3	vulnerable
	stretch (lts), stretch	0.25-3.1+deb9u4	vulnerable
	buster	0.25-4+deb10u2	vulnerable
	buster (security)	0.25-4+deb10u4	vulnerable
	bullseye	0.27.3-3+deb11u2	vulnerable
	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	Urgency	Origin	Debian Bugs
exiv2	source	(unstable)	0.27.5-1			988731

Notes

[bullseye] - exiv2 <no-dsa> (Minor issue)
[buster] - exiv2 <no-dsa> (Minor issue)
[stretch] - exiv2 <no-dsa> (Minor issue)
https://github.com/Exiv2/exiv2/security/advisories/GHSA-w8mv-g8qq-36mj
https://github.com/Exiv2/exiv2/pull/1657
[jessie] - exiv2 <no-dsa> (Minor issue)