Bug 2005467 (CVE-2020-21529) - CVE-2020-21529 transfig: stack-based buffer overflow in bezier_spline() in genepic.c
Summary: CVE-2020-21529 transfig: stack-based buffer overflow in bezier_spline() in ge...
Keywords:
Status: NEW
Alias: CVE-2020-21529
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: 2005517 2005518
Blocks: 2005482
TreeView+ depends on / blocked
 
Reported: 2021-09-17 18:09 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 09:27 UTC (History)
7 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 stack buffer overflow due to improper range checks. This leads to a denial of service, impacting availability of the program.
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Description Guilherme de Almeida Suckevicz 2021-09-17 18:09:43 UTC
fig2dev 3.2.7b contains a stack buffer overflow in the bezier_spline function in genepic.c.

Reference:
https://sourceforge.net/p/mcj/tickets/65/

Comment 2 Garrett Tucker 2021-09-17 21:02:00 UTC
After analysis and testing with provided PoC, RHEL 8.4.0 - 9.0.0 is affected by this flaw. The patch to fix this flaw is: https://sourceforge.net/p/mcj/fig2dev/ci/e3cee2576438f47a3b8678c6960472e625f8f7d7/ and can be easily backported to fix the existing flaws.

Comment 3 Garrett Tucker 2021-10-19 17:07:59 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


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