1377 : IPFilter Firewall SYN/RST Race Condition
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Info

Last Modified
10 months ago

Percent Complete
100%

Disclosure
May 25, 2000

Discovery
Unknown

Dates

Exploit
May 25, 2000

Solution
Unknown

Description

 IPFilter contains a flaw that may allow a remote attacker to bypass the ruleset. The issue is due to the presence of overlapping rules that relate to "return-rst" and "keep state". These two rules create a race condition that may allow an attacker to send the right sequence of packets to win, allowing them to bypass the filter rules completely.

Classification

 Location: Remote/Network Access Required
Attack Type: Input Manipulation, Race Condition
Impact: Loss of Integrity
Exploit: Exploit Available
Disclosure: OSVDB Verified

Solution

 Upgrade to version 3.3.16, 3.4.4 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products
Darren Reed
Watch-list
IPFilter
Watch-list
 3.3.15
3.4.3

References

Credit
  • EMF - emfBrand New Doo Dooprettyhatemachine.obfuscation.org - Obfuscation Research Laboratories

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