Bug 1992202 (CVE-2021-34334)

Summary:	CVE-2021-34334 exiv2: DoS due to integer overflow in loop counter
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:	1992203, 1992204, 1996166, 1996167, 1996168
Bug Blocks:	1992216

Description Guilherme de Almeida Suckevicz 2021-08-10 18:01:27 UTC

Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. An infinite loop is triggered when Exiv2 is used to read 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. The bug is fixed in version v0.27.5.

Reference:
https://github.com/Exiv2/exiv2/security/advisories/GHSA-hqjh-hpv8-8r9p

Upstream patch:
https://github.com/Exiv2/exiv2/pull/1766

Comment 1 Guilherme de Almeida Suckevicz 2021-08-10 18:01:47 UTC

Created exiv2 tracking bugs for this issue:

Affects: fedora-all [bug 1992204]


Created mingw-exiv2 tracking bugs for this issue:

Affects: fedora-all [bug 1992203]

Comment 2 Garrett Tucker 2021-08-20 12:55:56 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-2021-37616 which is correctly labeled as AV:L not AV:N.