USN-2855-1: Samba vulnerabilities

Releases

• Ubuntu 15.10
• Ubuntu 15.04
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

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

Details

Thilo Uttendorfer discovered that the Samba LDAP server incorrectly handled
certain packets. A remote attacker could use this issue to cause the LDAP
server to stop responding, resulting in a denial of service. This issue
only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10.
(CVE-2015-3223)

Jan Kasprzak discovered that Samba incorrectly handled certain symlinks. A
remote attacker could use this issue to access files outside the exported
share path. (CVE-2015-5252)

Stefan Metzmacher discovered that Samba did not enforce signing when
creating encrypted connections. If a remote attacker were able to perform a
machine-in-the-middle attack, this flaw could be exploited to view sensitive
information. (CVE-2015-5296)

It was discovered that Samba incorrectly performed access control when
using the VFS shadow_copy2 module. A remote attacker could use this issue
to access snapshots, contrary to intended permissions. (CVE-2015-5299)

Douglas Bagnall discovered that Samba incorrectly handled certain string
lengths. A remote attacker could use this issue to possibly access
sensitive information. (CVE-2015-5330)

It was discovered that the Samba LDAP server incorrectly handled certain
packets. A remote attacker could use this issue to cause the LDAP server to
stop responding, resulting in a denial of service. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10. (CVE-2015-7540)

Andrew Bartlett discovered that Samba incorrectly checked administrative
privileges during creation of machine accounts. A remote attacker could
possibly use this issue to bypass intended access restrictions in certain
environments. This issue only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and
Ubuntu 15.10. (CVE-2015-8467)

Update instructions

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

Ubuntu 15.10

• samba - 2:4.1.17+dfsg-4ubuntu3.1

Ubuntu 15.04

• samba - 2:4.1.13+dfsg-4ubuntu3.1

Ubuntu 14.04

• samba - 2:4.1.6+dfsg-1ubuntu2.14.04.11

Ubuntu 12.04

• samba - 2:3.6.3-2ubuntu2.13

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

References

• CVE-2015-3223
• CVE-2015-5252
• CVE-2015-5296
• CVE-2015-5299
• CVE-2015-5330
• CVE-2015-7540
• CVE-2015-8467

Related notices

• USN-2856-1: python-ldb-dev, libldb-dev, ldb, ldb-tools, python-ldb, libldb1