SB2018112823 - Fedora 28 update for samba

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Main Vulnerability Database SB2018112823

SB2018112823 - Fedora 28 update for samba

Published: November 28, 2018 Updated: April 24, 2025

Security Bulletin ID SB2018112823
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Infinite loop (CVE-ID: CVE-2018-14629)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 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


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.


2) Double-free error (CVE-ID: CVE-2018-16841)

CWE-ID: CWE-415 - Double Free

CVSSv4: 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


The vulnerability allows a remote authenticated attacker to cause DoS condition.

The vulnerability exists due to Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ when configured to accept smart-card authentication. A remote attacker can trigger double-free with talloc_free() and directly calls abort() and cause the KDC process to crash.


3) NULL pointer dereference (CVE-ID: CVE-2018-16851)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 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


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.


4) Denial of service (CVE-ID: CVE-2018-16853)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: 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


The vulnerability allows a remote authenticated attacker to cause DoS condition.

The vulnerability exists due to use of experimental MIT Kerberos build of the Samba AD DC. A remote attacker can crash the KDC when Samba is built in the non-default MIT Kerberos configuration.


Remediation

Install update from vendor's website.

References