Bug 1877772 (CVE-2020-24979) - CVE-2020-24979 bison: Buffer overflow in src/symtab.c via crafted input file redefining the EOF token can lead to DoS
Summary: CVE-2020-24979 bison: Buffer overflow in src/symtab.c via crafted input file ...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-24979
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: 1877776 1882044 1882045
Blocks: 1877775
TreeView+ depends on / blocked
 
Reported: 2020-09-10 12:18 UTC by Michael Kaplan
Modified: 2023-09-15 00:47 UTC (History)
5 users (show)

Fixed In Version:
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Last Closed: 2021-11-02 17:46:42 UTC
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Description Michael Kaplan 2020-09-10 12:18:40 UTC 
A Buffer Overflow vulnerability was found in src/symtab.c in GNU bison 3.7.1.1-cb7dc-dirty. A local attacker may execute bison with crafted input file redefining the EOF token, which could triggers Heap buffer overflow and thus cause system crash.

References:

https://github.com/akimd/bison/commit/bfd851e2d621734886c66c0af26e861e718510b2
https://lists.gnu.org/r/bug-bison/2020-08/msg00008.html
Comment 1 Michael Kaplan 2020-09-10 12:20:04 UTC 
Created bison tracking bugs for this issue:

Affects: fedora-all [bug 1877776]
Comment 6 Todd Cullum 2020-09-23 16:55:33 UTC 
Mitigation:

This flaw can be mitigated by not supplying untrusted input to be processed by GNU Bison.
Comment 7 Red Hat Bugzilla 2023-09-15 00:47:51 UTC 
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 500 days
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