CVE-2021-29457

NameCVE-2021-29457
DescriptionExiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. A heap buffer overflow was found in Exiv2 versions v0.27.3 and earlier. The heap overflow is triggered when Exiv2 is used to write metadata into a crafted image file. An attacker could potentially exploit the vulnerability to gain code execution, if they can trick the victim into running Exiv2 on a crafted image file. 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 `insert`. The bug is fixed in version v0.27.4.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2750-1, DSA-4958-1
NVD severitymedium
Debian Bugs991705

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
exiv2 (PTS)stretch0.25-3.1+deb9u2vulnerable
stretch (security)0.25-3.1+deb9u3fixed
buster0.25-4+deb10u1vulnerable
buster (security)0.25-4+deb10u2fixed
bullseye (security)0.27.3-3+deb11u1fixed
bookworm, sid, bullseye0.27.3-3vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
exiv2sourcestretch0.25-3.1+deb9u3DLA-2750-1
exiv2sourcebuster0.25-4+deb10u2DSA-4958-1
exiv2sourcebullseye0.27.3-3+deb11u1
exiv2source(unstable)(unfixed)991705

Notes

https://github.com/Exiv2/exiv2/security/advisories/GHSA-v74w-h496-cgqm
https://github.com/Exiv2/exiv2/issues/1529
https://github.com/Exiv2/exiv2/pull/1534
https://github.com/Exiv2/exiv2/commit/13e5a3e02339b746abcaee6408893ca2fd8e289d
buster-security and bullseye-security updates refer to CVE-2021-31291, which
was an addditional (and then rejected) CVE ID for the same issue as CVE-2021-29457

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