CVE-2020-24240

5.5MEDIUM

Key Information:

Vendor
Gnu
Status
Bison
Vendor
CVE Published:
25 August 2020

Summary

GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a '\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.

References

https://github.com/akimd/bison/commit/be95a4fe2951374676e...
x_refsource_MISC
https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html
x_refsource_MISC
https://github.com/akimd/bison/compare/v3.7...v3.7.1
x_refsource_MISC

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.