SB20200930106 - Out-of-bounds write in K.Kosako Oniguruma
Published: September 30, 2020 Updated: October 14, 2020
Security Bulletin ID
SB20200930106
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2020-26159)
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 .
Remediation
Install update from vendor's website.
References
- 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/