|
Cisco PIX Spoofed TCP SYN Packets Denial of Service
|
|
Secunia Advisory:
|
SA17670
|
|
|
Release Date:
|
2005-11-23
|
|
Last Update:
|
2008-06-18
|
|
Popularity:
|
15,031 views
|
|
|
Critical:
|
Not critical
|
|
Impact:
|
DoS
|
|
Where:
|
From remote
|
|
Solution Status:
|
Vendor Workaround
|
|
| OS: | Cisco PIX 6.x
Cisco PIX 7.x
|
|
|
Secunia CVSS-2 Score:
|
Available in Secunia business solutions 
|
|
|
Subscribe:
|
Instant alerts on relevant vulnerabilities
|
|
| Advisory Content (Page 2 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
|
Solution:
The vendor recommends the following workaround.
1) Issue the commands "clear xlate" or "clear local-host <ip address on the higher security level interface>" to allow the firewall to pass connections again.
2) Modify the default TCP embryonic connection timeout to a lower value. e.g. 10 seconds.
3) Configure TCP Intercept to allow PIX to proxy all TCP connection attempts originated from behind any firewall interface after the first connection.
4) Cisco PIX/ASA software version 7.0 can be configured to verify TCP checksums. This will have a performance impact.
Provided and/or discovered by:
Konstantin V. Gavrilenko, Arhont Ltd
Changelog:
2005-11-24: Added CVE reference and link to US-CERT vulnerability note.
2005-11-29: Updated link in "Original Advisory" section.
2006-03-08: Updated "Description" and "Original Advisory" sections.
2008-06-18: Updated vendor link in "Original Advisory" section.
Original Advisory:
Cisco:
http://www.cisco.com/en/US/products/s...ecurity_response09186a00805b6d45.html
Arhont Ltd:
http://lists.grok.org.uk/pipermail/full-disclosure/2006-March/042771.html
http://lists.grok.org.uk/pipermail/full-disclosure/2006-March/042772.html
Other References:
US-CERT VU#853540:
http://www.kb.cert.org/vuls/id/853540
Change Page:
[ 1 ] [ 2 ] [ 3 ]
|
|
|
Track this Secunia Advisory
|
Customers of the Secunia Vulnerability Intelligence solutions will automatically receive updates when new information regarding this advisory is released.
Read more about our Vulnerability Intelligence solutions and what they can do for you and your company.
|
|
|
About this Secunia Advisory
|
Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
|
