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>
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:
ECX 7C91056D ntdll.7C91056D
EBX 00E4E053 ASCII "GCR"
ESP 00E2FC7C ASCII "XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
EBP 00E4E050 ASCII "A0"
ESI 00E2FD28 ASCII "XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
EDI 00E4E057 ASCII "HOSTNAME<DEVBOX>HARDWARE<0011
SEH chain of thread 00000DA4, item 0
Log data, item 0
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
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.
A vendor advisory for this issue is available at:
Patches for this issue are available at:
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
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
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Copyright © 2005 Verisign, Inc.
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