Heap-based buffer overflow in re2c - CVE-2020-11958
Published: July 26, 2020
Vulnerability identifier: #VU31883
CSH Severity: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2020-11958
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
re2c
re2c
Software vendor:
www.re2c.org
www.re2c.org
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the Scanner::fill in parse/scanner.cc via a long lexeme. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install update from vendor's website.
External links
- http://www.openwall.com/lists/oss-security/2020/04/21/1
- https://blogs.gentoo.org/ago/2020/04/19/re2c-heap-overflow-in-scannerfill-scanner-cc/
- https://github.com/skvadrik/re2c/commit/c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776a
- https://usn.ubuntu.com/4338-1/
- https://usn.ubuntu.com/4338-2/
- https://www.openwall.com/lists/oss-security/2020/04/19/1