Vulnerability identifier: #VU46312
Vulnerability risk: Medium
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-122
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
GNU Bison
Other software /
Other software solutions
Vendor: GNU
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in src/symtab.c in GNU bison when processing files. A remote attacker can trick the victim to open a specially crafted file that redefines the EOF token, trigger heap-based buffer overflow and crash the application.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
GNU Bison: 3.7 - 3.7.1
External links
http://github.com/akimd/bison/commit/bfd851e2d621734886c66c0af26e861e718510b2
http://lists.gnu.org/r/bug-bison/2020-08/msg00008.html
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.