Date: 29 May 2014
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AUSCERT External Security Bulletin Redistribution
Potential DOS in Samba internal DNS server
29 May 2014
AusCERT Security Bulletin Summary
Publisher: The Samba Team
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2014-0239
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== Subject: Potential DOS in Samba internal DNS server
== CVE ID#: CVE-2014-0239
== Versions: All versions of Samba later than 4.0.0
== Summary: The internal DNS server does not check the "reply" flag,
== potentially causing a packet loop.
Samba versions 4.0.0 and above have a flaw in DNS protocol handling in the
internal DNS server. The server will not check the "reply" flag in the DNS
packet header when processing a request. That makes it vulnerable to reply
to a spoofed reply packet with another reply. Two affected servers could thus
DOS each other.
Patches addressing this issue have been posted to:
Samba version 4.0.18 includes a patch for this issue.
Use the BIND_DLZ DNS backend to avoid this issue.
This problem was reported on IRC by a Samba user
Patch provided by Kai Blin of the Samba team.
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
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