Heap-based buffer overflow in GNU Bison - CVE-2020-24979
Published: September 7, 2020
Vulnerability identifier: #VU46312
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-24979
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
GNU Bison
bison (Alpine package)
bison (Alpine package)
How to mitigate CVE-2020-24979
Install updates from vendor's website.
GNU Bison - update to 3.7.2
bison (Alpine package) - update to 3.7.2-r0
bison (Alpine package) - update to 3.7.2-r0