Bug 1952612 (CVE-2021-29457)

Summary:	CVE-2021-29457 exiv2: Heap-based buffer overflow in Exiv2::Jp2Image::doWriteMetadata
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jgrulich, michel, rdieter
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	exiv2 0.27.4-RC2	Doc Type:	If docs needed, set a value
Doc Text:	There's a flaw in exiv2. An attacker who is able to supply a crafted file to an application linked against exiv2 could trigger an out-of-bounds write in heap memory. The highest risk of this flaw is to application confidentiality, integrity, and availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-02 23:30:28 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1952613, 1953772, 1953773
Bug Blocks:	1949273

Description Guilherme de Almeida Suckevicz 2021-04-22 16:42:57 UTC

Exiv2 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.

References:
https://github.com/Exiv2/exiv2/security/advisories/GHSA-v74w-h496-cgqm
https://github.com/Exiv2/exiv2/issues/1529

Upstream patch:
https://github.com/Exiv2/exiv2/pull/1534

Comment 1 Guilherme de Almeida Suckevicz 2021-04-22 16:43:14 UTC

Created exiv2 tracking bugs for this issue:

Affects: fedora-all [bug 1952613]

Comment 3 Todd Cullum 2021-04-26 22:12:34 UTC

Flaw summary:

In src/jp2image.cpp in the boxes_check() routine, there was not correct checking to ensure that the box length was valid. Specifically, a box length less than 8 could be accepted, which would cause an out-of-bounds write subsequently in Exiv2::Jp2Image::doWriteMetadata(). As this value can be supplied by a crafted file, it can result in an impact to confidentiality, integrity, and availability of an application linked with exiv2.

Comment 4 Todd Cullum 2021-04-26 22:15:43 UTC

External References:

https://github.com/Exiv2/exiv2/security/advisories/GHSA-v74w-h496-cgqm

Comment 6 errata-xmlrpc 2021-11-09 17:34:13 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4173 https://access.redhat.com/errata/RHSA-2021:4173