Samba: Multiple buffer overflows
Gentoo Linux Security Advisory
||GLSA 200407-21 / Samba
||July 29, 2004
||July 29, 2004: 02
All supported architectures
Two buffer overflows vulnerabilities were found in Samba, potentially
allowing the remote execution of arbitrary code.
Samba is a package which allows *nix systems to act as file servers for
Windows computers. It also allows *nix systems to mount shares exported by
a Samba/CIFS/Windows server. The Samba Web Administration Tool (SWAT) is a
web-based configuration tool part of the Samba package.
Evgeny Demidov found a buffer overflow in SWAT, located in the base64 data
decoder used to handle HTTP basic authentication (CAN-2004-0600). The same
flaw is present in the code used to handle the sambaMungedDial attribute
value, when using the ldapsam passdb backend. Another buffer overflow was
found in the code used to support the 'mangling method = hash' smb.conf
option (CAN-2004-0686). Note that the default Samba value for this option
is 'mangling method = hash2' which is not vulnerable.
The SWAT authentication overflow could be exploited to execute arbitrary
code with the rights of the Samba daemon process. The overflow in the
sambaMungedDial handling code is not thought to be exploitable. The buffer
overflow in 'mangling method = hash' code could also be used to execute
arbitrary code on vulnerable configurations.
Users disabling SWAT, not using ldapsam passdb backends and not using the
'mangling method = hash' option are not vulnerable.
All Samba users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv ">=net-fs/samba-3.0.5"
# emerge ">=net-fs/samba-3.0.5"