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TITLE:
Cisco Intrusion Detection / Prevention System "SSL Hello" Denial of
Service

SECUNIA ADVISORY ID:
SA22046

VERIFY ADVISORY:
http://secunia.com/advisories/22046/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
Cisco Intrusion Prevention System (IPS) 5.x
http://secunia.com/product/5600/
Cisco Intrusion Detection System (IDS) 4.x
http://secunia.com/product/12069/

DESCRIPTION:
A vulnerability has been reported in Cisco Intrusion Detection System
and Cisco Intrusion Prevention System, which can be exploited by
malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within the processing of
SSL v2 client Hello packets. This can be exploited to cause a DoS by
sending a specially crafted Hello packet to a vulnerable system.

Successful exploitation can cause the mainApp process to fail,
stopping a system from responding to remote management request sent
to the web administration interface or the command-line interface via
SSH, sending SMTP traps, and automatically updating ACLs (Access
Control Lists) on remote firewall systems.

The vulnerability affects the following products:
- Cisco IDS 4.1(x) software prior to 4.1(5c)
- Cisco IPS 5.0(x) software prior to 5.0(6p1)
- Cisco IPS 5.1(x) software prior to 5.1(2)

SOLUTION:
Apply updated software.

Cisco IDS 4.1(5b) and earlier:
Update to Cisco IDS 4.1(5c)

Cisco IPS 5.0(6p1) and earlier:
Update to Cisco IPS 5.0(6p2)

Cisco IPS 5.1(1) and earlier:
Update to Cisco IPS 5.1(2)

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20060920-ips.shtml

OTHER REFERENCES:
US-CERT VU#658884:
http://www.kb.cert.org/vuls/id/658884

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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.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
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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