NULL pointer dereference in Samba - CVE-2018-16851
Published: November 28, 2018
Vulnerability identifier: #VU16156
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-16851
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Samba
Affected software:
Samba
Samba
Detailed vulnerability description
The vulnerability allows a remote authenticated attacker to cause DoS condition.
The vulnerability exists due to the entries are cached in a single memory object with a maximum size of 256MB during the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client. A remote attacker can trigger NULL pointer dereference in the LDAP service when this size is reached and cause the process to crash.
How to mitigate CVE-2018-16851
The vulnerability has been fixed in the version 4.7.12, 4.8.7, and 4.9.3.