Bug 1992190 (CVE-2021-37623)

Summary:	CVE-2021-37623 exiv2: DoS due to infinite loop in JpegBase::printStructure
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	jgrulich, manisandro, michel, rdieter
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1992191, 1992192, 1996058, 1996060, 1996061
Bug Blocks:	1992216

Description Guilherme de Almeida Suckevicz 2021-08-10 17:44:14 UTC

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.

Reference:
https://github.com/Exiv2/exiv2/security/advisories/GHSA-mvc4-g5pv-4qqq

Upstream patch:
https://github.com/Exiv2/exiv2/pull/1790

Comment 1 Guilherme de Almeida Suckevicz 2021-08-10 17:44:36 UTC

Created exiv2 tracking bugs for this issue:

Affects: fedora-all [bug 1992191]


Created mingw-exiv2 tracking bugs for this issue:

Affects: fedora-all [bug 1992192]

Comment 2 Garrett Tucker 2021-08-20 12:49:09 UTC

The attack vector for this CVE is local, not network based. Exiv2 would require manual execution with specific flags, and requires user interaction on a crafted file to be able to exploit this flaw and is not bound to the network. This CVE is a very similar CVE to CVE-2021-37622 which is correctly labeled as AV:L not AV:N.