Bug 1854328 (CVE-2020-5238) - CVE-2020-5238 cmark-gfm: Exponential time to parse certain inputs could lead to DoS
Summary: CVE-2020-5238 cmark-gfm: Exponential time to parse certain inputs could lead ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-5238
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: 1854329 1855805 1865911
Blocks: 1854330
TreeView+ depends on / blocked
 
Reported: 2020-07-07 08:08 UTC by Marian Rehak
Modified: 2021-05-18 20:34 UTC (History)
1 user (show)

Fixed In Version: ghc-cmark-gfm 0.29.0.gfm.1
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Last Closed: 2021-05-18 20:34:00 UTC
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Description Marian Rehak 2020-07-07 08:08:18 UTC 
The table extension in GitHub Flavored Markdown before version 0.29.0.gfm.1 takes O(n * n) time to parse certain inputs. An attacker could craft a markdown table which would take an unreasonably long time to process, causing a denial of service. This issue does not affect the upstream cmark project.

Upstream Advisory:

https://github.com/github/cmark-gfm/security/advisories/GHSA-7gc6-9qr5-hc85
Comment 1 Marian Rehak 2020-07-07 08:09:03 UTC 
Created ghc-cmark-gfm tracking bugs for this issue:

Affects: fedora-all [bug 1854329]
Comment 2 Stefan Cornelius 2020-07-10 14:14:04 UTC 
Patch:
https://github.com/github/cmark-gfm/commit/85d895289c5ab67f988ca659493a64abb5fec7b4
Comment 6 errata-xmlrpc 2021-05-18 16:32:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1972 https://access.redhat.com/errata/RHSA-2021:1972
Comment 7 Product Security DevOps Team 2021-05-18 20:34:00 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-5238
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