RHSA-2008:0290 - Security Advisory

Topic

Updated samba packages that fix a security issue and two bugs are now
available for Red Hat Enterprise Linux 5.

This update has been rated as having critical security impact by the Red
Hat Security Response Team.

Description

Samba is a suite of programs used by machines to share files, printers, and
other information.

A heap-based buffer overflow flaw was found in the way Samba clients handle
over-sized packets. If a client connected to a malicious Samba server, it
was possible to execute arbitrary code as the Samba client user. It was
also possible for a remote user to send a specially crafted print request
to a Samba server that could result in the server executing the vulnerable
client code, resulting in arbitrary code execution with the permissions of
the Samba server. (CVE-2008-1105)

Red Hat would like to thank Alin Rad Pop of Secunia Research for
responsibly disclosing this issue.

This update also addresses two issues which prevented Samba from joining
certain Windows domains with tightened security policies, and prevented
certain signed SMB content from working as expected:

• when some Windows(r) 2000-based domain controllers were set to use

mandatory signing, Samba clients would drop the connection because of an
error when generating signatures. This presented as a "Server packet had
invalid SMB signature" error to the Samba client. This update corrects the
signature generation error.

• Samba servers using the "net ads join" command to connect to a Windows

Server(r) 2003-based domain would fail with "failed to get schannel session
key from server" and "NT_STATUS_ACCESS_DENIED" errors. This update
correctly binds to the NETLOGON share, allowing Samba servers to connect to
the domain properly.

Users of Samba are advised to upgrade to these updated packages, which
contain a backported patch to resolve these issues.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.2 ia64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.2 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.2 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.2 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 444637 - Join fails with stricter w2k3 security options set
• BZ - 446724 - CVE-2008-1105 Samba client buffer overflow
• BZ - 447380 - Signing issue: "Server packet had invalid SMB signature" with some Win2K servers

CVEs

• CVE-2008-1105

References

• http://www.redhat.com/security/updates/classification/#critical