Computer Associates License Client/Server GCR Network Buffer Overflow
iDEFENSE Security Advisory 03.02.05 www.idefense.com/application/poi/display?id=214&type=vulnerabilities March 2, 2005
The Computer Associates License Client/Server applications provide a method for CA products to register their licenses on the network. The License Client and Server are distributed with almost all CA software distributions. More information about Computer Associates software products is available from:
Remote exploitation of a buffer overflow vulnerability in Computer Associates License Server and License Client can allow attackers to execute arbitrary code.
The vulnerability specifically exists due to insufficient bounds checking on user-supplied values in GCR requests. The GCR request packet format is shown below:
A0 GCR HOSTNAME<DEVBOX>HARDWARE<001122334455>LOCALE<English> IDENT1<unknown>IDENT2<unknown>IDENT3<unknown>IDENT4<unknown> OS<Windows_NT 5.0>OLFFILE<0 0 0>SERVER<RMT>VERSION<3 1.54.0> NETWORK<127.0.0.1 HOSTNAME 255.255.255.0>MACHINE<PC_1586_1_3201> CHECKSUMS<1 2 3 4 5 6 7 8 9 10 11 12>RMTV<1.00><EOM>
If the IP address, hostname, or netmask contain large values, the stack overflow can be triggered.
Ollydbg output after SEH overwrite in CA License Server:
EAX 00630210 ECX 7C91056D ntdll.7C91056D EDX 003B0608 EBX 00E4E053 ASCII "GCR" ESP 00E2FC7C ASCII "XXXXXXXXXXXXXXXXXXXXXXXXXXXXX EBP 00E4E050 ASCII "A0" ESI 00E2FD28 ASCII "XXXXXXXXXXXXXXXXXXXXXXXXXXXXX EDI 00E4E057 ASCII "HOSTNAME<DEVBOX>HARDWARE<0011 EIP DEADC0DE
SEH chain of thread 00000DA4, item 0 Address=00E2FFA4 SE handler=58585858
Log data, item 0 Address=DEADC0DE Message=Access violation when executing [DEADC0DE]
Exploitation allows remote attackers to execute arbitrary code under the privileges of Local System. A GETCONFIG packet exchange which discloses the remote operating system version usually proceeds the GCR request and increases the likelihood of successful exploitation. The CA License Server does not run by default, but is packaged with most Computer Associates software distributions. The CA License Client does run by default and is packaged with almost all Computer Associates software.
iDEFENSE has confirmed that CA License Server 0.1.0.15 and CA License Client 0.1.0.15 are vulnerable.
Use a firewall to only allow trusted hosts to connect to the Computer Associates License Server and Client ports.
VI. VENDOR RESPONSE
A vendor advisory for this issue is available at:
Patches for this issue are available at:
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2005-0581 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. This is one of several overflows that have been assigned CAN-2005-0581.
VIII. DISCLOSURE TIMELINE
12/01/2004 Initial vendor notification 12/01/2004 Initial vendor response 03/02/2005 Coordinated public disclosure
An anonymous contributor is credited with discovering this vulnerability.
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X. LEGAL NOTICES
Copyright (c) 2005 iDEFENSE, Inc.
Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email firstname.lastname@example.org for permission.
Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.