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Cisco PIX Spoofed TCP SYN Packets Denial of Service
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Secunia Advisory:
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SA17670
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Release Date:
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2005-11-23
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Last Update:
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2008-06-18
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Popularity:
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14,936 views
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Critical:
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Not critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| OS: | Cisco PIX 6.x
Cisco PIX 7.x
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Secunia CVSS-2 Score:
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| Advisory Content (Page 2 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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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 ]
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