Bug 2005481 (CVE-2020-21535) - CVE-2020-21535 transfig: segmentation fault in the gencgm_start() in gencgm.c
Summary: CVE-2020-21535 transfig: segmentation fault in the gencgm_start() in gencgm.c
Keywords:
Status: NEW
Alias: CVE-2020-21535
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2006003
Blocks: 2005482
TreeView+ depends on / blocked
 
Reported: 2021-09-17 18:22 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-10-31 23:29 UTC (History)
6 users (show)

Fixed In Version:
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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 the usage of fgets. This leads to a denial of service, impacting availability of the program.
Clone Of:
Environment:
Last Closed:


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Description Guilherme de Almeida Suckevicz 2021-09-17 18:22:20 UTC
fig2dev 3.2.7b contains a segmentation fault in the gencgm_start function in gencgm.c.

Reference:
https://sourceforge.net/p/mcj/tickets/62/

Comment 1 Garrett Tucker 2021-09-20 16:31:07 UTC
After analysis of this flaw, all versions of RHEL 8 are affected. RHEL 9 remains unaffected as the patch to fix this flaw was applied and introduced in RHEL 9. The patch applied is: https://sourceforge.net/p/mcj/fig2dev/ci/41b9bb838a3d544539f6e68aa4f87d70ef7d45ce/. This flaw was caused by the use of fgets which led to a buffer overflow and segmentation fault in read_objects when a specially crafted file was used as input to the program.


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