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
| Link | Resource |
|---|---|
| https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d | Patch Third Party Advisory |
| https://github.com/akimd/bison/compare/v3.7...v3.7.1 | Third Party Advisory |
| https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html | Mailing List Vendor Advisory |
| https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d | Patch Third Party Advisory |
| https://github.com/akimd/bison/compare/v3.7...v3.7.1 | Third Party Advisory |
| https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html | Mailing List Vendor Advisory |
Configurations
History
21 Nov 2024, 05:14
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/akimd/bison/commit/be95a4fe2951374676efc9454ffee8638faaf68d - Patch, Third Party Advisory | |
| References | () https://github.com/akimd/bison/compare/v3.7...v3.7.1 - Third Party Advisory | |
| References | () https://lists.gnu.org/r/bug-bison/2020-07/msg00051.html - Mailing List, Vendor Advisory |
Information
Published : 2020-08-25 14:15
Updated : 2024-11-21 05:14
NVD link : CVE-2020-24240
Mitre link : CVE-2020-24240
CVE.ORG link : CVE-2020-24240
JSON object : View
Products Affected
gnu
- bison
CWE
CWE-416
Use After Free