CVE-2021-29470

NameCVE-2021-29470
DescriptionExiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. An out-of-bounds read was found in Exiv2 versions v0.27.3 and earlier. The out-of-bounds read 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 by crashing Exiv2, 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)
NVD severitymedium
Debian Bugs987450

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
exiv2 (PTS)stretch0.25-3.1+deb9u2fixed
stretch (security)0.25-3.1+deb9u1fixed
buster0.25-4+deb10u1vulnerable
bullseye, sid0.27.3-3vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
exiv2sourcestretch(not affected)
exiv2source(unstable)(unfixed)987450

Notes

[buster] - exiv2 <no-dsa> (Minor issue)
[stretch] - exiv2 <not-affected> (Vulnerable code introduced later)
https://github.com/Exiv2/exiv2/security/advisories/GHSA-8949-hhfh-j7rj
https://github.com/Exiv2/exiv2/pull/1581
https://github.com/Exiv2/exiv2/commit/b3de96f4b4408347bed57e625963720e8d0dd2ea
https://github.com/Exiv2/exiv2/commit/c372f2677d6f7cf88a8f26ef6bc175561e406ee2

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