NULL pointer dereference in Samba - CVE-2019-12436
Published: June 19, 2019
Vulnerability identifier: #VU18845
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-12436
CWE-ID: CWE-476
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error when processinf LDAP search queries. A remote authenticated user can send a specially crafted request to the affected AD DC LDAP server and perform a denial of service (DoS) attack.
Affected software
Samba
samba (Ubuntu package)
samba (Alpine package)
samba
Fedora
samba (Ubuntu package)
samba (Alpine package)
samba
Fedora
How to mitigate CVE-2019-12436
Install updates from vendor's website.
Samba - update to 4.10.5
samba (Ubuntu package) - update to 2:4.10.0+dfsg-0ubuntu2.2
samba (Alpine package) - update to 4.10.5-r0
samba - addressed in versions 4.10.5-0.fc30, 4.10.5-1.fc30
samba (Ubuntu package) - update to 2:4.10.0+dfsg-0ubuntu2.2
samba (Alpine package) - update to 4.10.5-r0
samba - addressed in versions 4.10.5-0.fc30, 4.10.5-1.fc30