Samba: Execution of arbitrary code
Gentoo Linux Security Advisory
||GLSA 200711-29 / samba
||November 20, 2007
||December 05, 2007: 03
All supported architectures
Samba contains two buffer overflow vulnerabilities potentially resulting in
the execution of arbitrary code.
Samba is a suite of SMB and CIFS client/server programs for UNIX.
Two vulnerabilities have been reported in nmbd. Alin Rad Pop (Secunia
Research) discovered a boundary checking error in the
reply_netbios_packet() function which could lead to a stack-based
buffer overflow (CVE-2007-5398). The Samba developers discovered a
boundary error when processing GETDC logon requests also leading to a
buffer overflow (CVE-2007-4572).
To exploit the first vulnerability, a remote unauthenticated attacker
could send specially crafted WINS "Name Registration" requests followed
by a WINS "Name Query" request. This might lead to execution of
arbitrary code with elevated privileges. Note that this vulnerability
is exploitable only when WINS server support is enabled in Samba. The
second vulnerability could be exploited by sending specially crafted
"GETDC" mailslot requests, but requires Samba to be configured as a
Primary or Backup Domain Controller. It is not believed the be
exploitable to execute arbitrary code.
To work around the first vulnerability, disable WINS support in Samba
by setting "wins support = no" in the "global" section of your
smb.conf and restart Samba.
All Samba users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-fs/samba-3.0.27a"
The first vulnerability (CVE-2007-5398) was already fixed in Samba