Advisory Published

USN-3738-1: Samba vulnerabilities

First published: Tue Aug 14 2018(Updated: )

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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libsmbclient<2:4.7.6+dfsg~ubuntu-0ubuntu2.2
2:4.7.6+dfsg~ubuntu-0ubuntu2.2
=18.04
All of
ubuntu/samba<2:4.7.6+dfsg~ubuntu-0ubuntu2.2
2:4.7.6+dfsg~ubuntu-0ubuntu2.2
=18.04
All of
ubuntu/libsmbclient<2:4.3.11+dfsg-0ubuntu0.16.04.15
2:4.3.11+dfsg-0ubuntu0.16.04.15
=16.04
All of
ubuntu/samba<2:4.3.11+dfsg-0ubuntu0.16.04.15
2:4.3.11+dfsg-0ubuntu0.16.04.15
=16.04
All of
ubuntu/libsmbclient<2:4.3.11+dfsg-0ubuntu0.14.04.16
2:4.3.11+dfsg-0ubuntu0.14.04.16
=14.04
All of
ubuntu/samba<2:4.3.11+dfsg-0ubuntu0.14.04.16
2:4.3.11+dfsg-0ubuntu0.14.04.16
=14.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this security advisory?

    The vulnerability ID for this security advisory is USN-3738-1.

  • What are the affected software versions and packages?

    The affected software versions are Samba 2:4.3.11+dfsg-0ubuntu0.14.04.16, Samba 2:4.3.11+dfsg-0ubuntu0.16.04.15, Samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.2. The affected packages are libsmbclient and samba.

  • What are the potential impacts of this vulnerability?

    The potential impacts of this vulnerability include denial of service and possible execution of arbitrary code.

  • How can I fix the vulnerability?

    To fix the vulnerability, update the affected software packages to the recommended versions: libsmbclient 2:4.7.6+dfsg~ubuntu-0ubuntu2.2 and samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.2.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability on the Ubuntu Security Notices page: [link](https://ubuntu.com/security/CVE-2018-10858)

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