CVE-2019-19906

cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

Weakness

A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

Affected Software

Potential Mitigations

References

• http://seclists.org/fulldisclosure/2020/Jul/23
• http://seclists.org/fulldisclosure/2020/Jul/24
• http://www.openwall.com/lists/oss-security/2022/02/23/4
• https://github.com/cyrusimap/cyrus-sasl/issues/587
• https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2019/12/msg00027.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MW6GZCLECGL2PBNHVNPJIX4RPVRVFR7R/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OB4GSVOJ6ESHQNT5GSV63OX5D4KPSTGT/
• https://seclists.org/bugtraq/2019/Dec/42
• https://support.apple.com/kb/HT211288
• https://support.apple.com/kb/HT211289
• https://usn.ubuntu.com/4256-1/
• https://www.debian.org/security/2019/dsa-4591
• https://www.openldap.org/its/index.cgi/Incoming?id=9123