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Rule:
--
Sid:
2094
--
Summary:
vulnerability in the rpc service for the Calendar Manager Service Daemon
(CMSD) used by XDR.
--
Impact:
System compromise, denial of service, execution of arbitrary code,
information disclosure.
--
Detailed Information:
A vulnerability exists in various implementations of external data
representation (XDR) libraries. An integer overflow in a component
(xdr_array) used by XDR can lead to a buffer overflow.
The XDR libraries are widely used by multiple vendors to provide a
framework for data transmission across networks. This is most commonly
used in RPC implementations.
A specially crafted rpc request containing a large number of arguments
to xdr_array can lead to remote system compromise and super user access
to the target host. Additionally, a denial of service and execution of
arbitrary code with the privilege of the super user is also possible
depending on the platform used.
--
Affected Systems:
Multiple verndors including all those using:
Sun Microsystems Network Services Library (libnsl)
GNU C library with sunrpc (glibc)
BSD-derived libraries with XDR/RPC routines (libc)
--
Attack Scenarios:
The attacker needs to send a specially crafted rpc request containing a
large number of arguments for xdr_array to the target host.
--
Ease of Attack:
Simple
--
False Positives:
None Known
--
False Negatives:
None Known
--
Corrective Action:
Apply the appropriate vendor supplied patches.
Upgrade the vendor libraries to the latest non-affected versions. Any
statically linked binaries and applications must be recompiled and
restarted after the upgrade.
Disallow all RPC requests from external sources and use a firewall to
block access to RPC ports from outside the LAN.
--
Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
--
Additional References:
Bugtraq:
http://www.securityfocus.com/bid/5356
CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0391
CERT:
http://www.cert.org/advisories/CA-2002-25.html
http://www.kb.cert.org/vuls/id/192995
--
|
