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Firewall ECE-bit bypass

Information

Severity

Severity

High

Family

Family

Firewalls

CVSSv2 Base

CVSSv2 Base

7.5

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

16 years ago

Modified

Modified

3 years ago

Summary

The remote host seems vulnerable to a bug wherein a remote attacker can circumvent the firewall by setting the ECE bit within the TCP flags field.

Affected Software

Affected Software

At least one firewall (ipfw) is known to exhibit this sort of behavior. Known vulnerable systems include all FreeBSD 3.x, 4.x, 3.5-STABLE, and 4.2-STABLE.

Solution

Solution

If you are running FreeBSD 3.X, 4.x, 3.5-STABLE, 4.2-STABLE, upgrade your firewall. If you are not running FreeBSD, contact your firewall vendor for a patch.

Common Vulnerabilities and Exposures (CVE)