Bug 2005478 (CVE-2020-21534) - CVE-2020-21534 transfig: global buffer overflow in the get_line() in read.c
Summary: CVE-2020-21534 transfig: global buffer overflow in the get_line() in read.c
Keywords:
Status: NEW
Alias: CVE-2020-21534
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: 2005924
Blocks: 2005482
TreeView+ depends on / blocked
 
Reported: 2021-09-17 18:20 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 18:20:37 UTC
fig2dev 3.2.7b contains a global buffer overflow in the get_line function in read.c.

Reference:
https://sourceforge.net/p/mcj/tickets/58/

Comment 1 Garrett Tucker 2021-09-20 13:44:51 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.

Comment 3 Garrett Tucker 2021-10-19 17:12:30 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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