GLSA-200407-21 : Samba: Multiple buffer overflows
Critical Nessus Plugin ID 14554
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200407-21 (Samba: Multiple buffer overflows)
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.
SolutionAll Samba users should upgrade to the latest version:
# emerge sync # emerge -pv '>=net-fs/samba-3.0.5' # emerge '>=net-fs/samba-3.0.5'