USN-3738-1: Samba vulnerabilities

14 August 2018

samba vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in Samba.

Software Description

  • samba - SMB/CIFS file, print, and login server for Unix

Details

Svyatoslav Phirsov discovered that the Samba libsmbclient library incorrectly handled extra long filenames. A malicious server could use this issue to cause Samba to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-10858)

Volker Mauel discovered that Samba incorrectly handled database output. When used as an Active Directory Domain Controller, a remote authenticated attacker could use this issue to cause Samba to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-10918)

Phillip Kuhrt discovered that the Samba LDAP server incorrectly handled certain confidential attribute values. A remote authenticated attacker could possibly use this issue to obtain certain sensitive information. (CVE-2018-10919)

Vivek Das discovered that Samba incorrectly handled NTLMv1 being explicitly disabled on the server. A remote user could possibly be authenticated using NTLMv1, contrary to expectations. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-1139)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04 LTS
libsmbclient - 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
Ubuntu 16.04 LTS
libsmbclient - 2:4.3.11+dfsg-0ubuntu0.16.04.15
samba - 2:4.3.11+dfsg-0ubuntu0.16.04.15
Ubuntu 14.04 LTS
libsmbclient - 2:4.3.11+dfsg-0ubuntu0.14.04.16
samba - 2:4.3.11+dfsg-0ubuntu0.14.04.16

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References