Ubuntu 4167-1: Samba Security Advisory on Remote Attacks and DoS

ubuntu

October 29, 2019

Several security issues were fixed in Samba.

Summary

Several security issues were fixed in Samba.

Software Description:

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

Details:

Michael Hanselmann discovered that the Samba client code incorrectly

handled path separators. If a user were tricked into connecting to a

malicious server, a remote attacker could use this issue to cause the

client to access local pathnames instead of network pathnames.

(CVE-2019-10218)

Simon Fonteneau and Björn Baumbach discovered that Samba incorrectly

handled the check password script. This issue could possibly bypass custom

password complexity checks, contrary to expectations. This issue only

affected Ubuntu 18.04 LTS, Ubuntu 19.04, and Ubuntu 19.10. (CVE-2019-14833)

Adam Xu discovered that Samba incorrectly handled the dirsync LDAP control.

A remote attacker with "get changes" permissions could possibly use this

issue to cause Samba to crash, resulting in a denial of service.

(CVE-2019-14847)

Topics Covered

security advisory denial of service samba remote attack ubuntu path handling password complexity

Update Instructions

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

Ubuntu 19.10:
  libsmbclient                    2:4.10.7+dfsg-0ubuntu2.2
  samba                           2:4.10.7+dfsg-0ubuntu2.2

Ubuntu 19.04:
  libsmbclient                    2:4.10.0+dfsg-0ubuntu2.6
  samba                           2:4.10.0+dfsg-0ubuntu2.6

Ubuntu 18.04 LTS:
  libsmbclient                    2:4.7.6+dfsg~ubuntu-0ubuntu2.13
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.13

Ubuntu 16.04 LTS:
  libsmbclient                    2:4.3.11+dfsg-0ubuntu0.16.04.23
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.23

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