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TITLE:
Cisco IOS Regular Expressions Denial of Service

SECUNIA ADVISORY ID:
SA26798

VERIFY ADVISORY:
http://secunia.com/advisories/26798/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

OPERATING SYSTEM:
Cisco IOS 12.x
http://secunia.com/product/182/
Cisco IOS R12.x
http://secunia.com/product/50/

DESCRIPTION:
A vulnerability has been reported in Cisco IOS, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error when handling regular
expressions containing repetition operators and pattern recalls. This
can be exploited to cause a stack overflow by sending a command with
specially crafted regular expressions to the command line interface.

Successful exploitation causes the device to crash and requires a
reboot, but requires valid user credentials.

The vulnerability is reported in versions 12.0, 12.1, 12.2, 12.3, and
12.4.

SOLUTION:
Restrict access to trusted people only.

PROVIDED AND/OR DISCOVERED BY:
Sebastian Wiesinger

ORIGINAL ADVISORY:
http://www.cisco.com/en/US/products/products_security_response09186a00808bb91c.html

OTHER REFERENCES:
https://puck.nether.net/pipermail/cisco-nsp/2007-August/043002.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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http://secunia.com/about_secunia_advisories/


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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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