Out-of-bounds write in Oniguruma - CVE-2020-26159
Published: September 30, 2020 / Updated: October 14, 2020
Vulnerability identifier: #VU47647
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2020-26159
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: K.Kosako
Affected software:
Oniguruma
Oniguruma
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
In Oniguruma 6.9.5_rev1, an attacker able to supply a regular expression for compilation may be able to overflow a buffer by one byte in concat_opt_exact_str in src/regcomp.c .
How to mitigate CVE-2020-26159
Install update from vendor's website.
Sources
- http://www.openwall.com/lists/oss-security/2020/09/30/7
- https://github.com/kkos/oniguruma/commit/cbe9f8bd9cfc6c3c87a60fbae58fa1a85db59df0
- https://github.com/kkos/oniguruma/issues/207
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2ZCUPCKJNSUHQMXXZBRNDDGQQLBJ2ACT/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4NHVR7X5ZLXUGW3PBCPQMNFQ3OJCSMQD/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZFUJY7BUIFBTZ3IUHVHCID4JYCRDGKPS/