Cisco Intrusion Detection / Prevention System "SSL Hello" Denial of Service
Secunia Advisory: SA22046
Release Date: 2006-09-21
Popularity: 6,724 views

Critical:
Less critical
Impact: DoS
Where: From local network
Solution Status: Vendor Patch

OS:Cisco Intrusion Detection System (IDS) 4.x
Cisco Intrusion Prevention System (IPS) 5.x

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CVE reference:CVE-2006-4910
CVE-2006-4911


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.

Changelog:
2006-09-21: Added CVE references.

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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