#VU16154 Infinite loop in Samba - CVE-2018-14629

Vulnerability identifier: #VU16154

Vulnerability risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-14629

CWE-ID: CWE-835

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Samba
Server applications / Directory software, identity management

Vendor: Samba

Description

The vulnerability allows a local unauthenticated attacker to cause DoS condition.

The vulnerability exists due to infinite query recursion caused by CNAME loops. A local attacker can add any dns record via ldap using the ldbadd tool, trigger infinite loop and cause the server to crash.

Mitigation
The vulnerability has been fixed in the version 4.7.12, 4.8.7, and 4.9.3.

Vulnerable software versions

Samba: 4.0.0 - 4.0.26, 4.1.0 - 4.1.23, 4.2.0 - 4.2.14, 4.3.0 - 4.3.13, 4.4.0 rc4 - 4.4.16, 4.5.0 - 4.5.16, 4.6.0 - 4.6.16, 4.7.0 - 4.7.11, 4.8.0 - 4.8.6, 4.9.0 - 4.9.2

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External links
https://www.samba.org/samba/security/CVE-2018-14629.html

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.