Bug 2005474 (CVE-2020-21532)

Summary:	CVE-2020-21532 transfig: global buffer overflow in the setfigfont() in genepic.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	databases-maint, hhorak, kasal, mschorm, pkubat, zmiklank
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	In transfig's fig2dev 3.2.7b it is possible for an attacker to create a specially crafted file that causes a buffer overflow due to accepting an invalid value. This leads to a denial of service, impacting availability of the program.	Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2006006, 2006007
Bug Blocks:	2005482

Description Guilherme de Almeida Suckevicz 2021-09-17 18:17:42 UTC

fig2dev 3.2.7b contains a global buffer overflow in the setfigfont function in genepic.c.

Reference:
https://sourceforge.net/p/mcj/tickets/64/

Comment 1 Garrett Tucker 2021-09-20 16:43:46 UTC

After analysis of this flaw, all versions of RHEL 8 and 9 are affected. The patch that can be applied to fix this flaw is: https://sourceforge.net/p/mcj/fig2dev/ci/00cdedac7a0b029846dee891769a1e77df83a01b/ and https://sourceforge.net/p/mcj/fig2dev/ci/421afa17d8cb8dafcaf3e6044a70790fa4fe307b/.This flaw was caused by accepting -1 as a value for a tex font. This lead to an out of bounds error and resulted in a global buffer overflow.

Comment 3 Garrett Tucker 2021-10-19 17:11:02 UTC

Analysis did not show any sign of being able to achieve code execution with this flaw. The flaw present caused a denial of service to the program affecting availability, but with no found effects on Integrity or Confidentiality of data. As such the CVSS score should be 5.5/CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H