IBM SecureWay Firewall malformed TCP packet flood denial of service
| secureway-tcp-flood-dos (10249) |  Low Risk |
Description:
IBM SecureWay Firewall is vulnerable to a denial of service attack. If a remote attacker floods the firewall with malformed TCP packets that have all of the flags set to zero, the attacker could cause the firewall to consume 100% of the available CPU resources, which would result in a denial of service against legitimate users.
Consequences:
Denial of Service
Remedy:
Apply the APAR IR49046, available from the IBM Support Web site. See References.
References:
- BugTraq Mailing List, Wed Oct 09 2002 - 08:42:34 CDT : Flood ACK packets cause an IBM SecureWay FireWall DoS.
- IBM Support Web site: IR49046: FIREWALL HANGS WITH PACKET FLOOD ATTACK WITH ALL FLAG BITS SET TO 0.
- SecuriTeam Mailing List, UNIX focus 1 Oct 2002: Flood ACK Packets Cause an IBM SecureWay Firewall to Hang.
- BID-5924: IBM SecureWay Firewall Denial of Service Vulnerability
- CVE-2002-1203: IBM SecureWay Firewall before 4.2.2 performs extra processing before determining that a packet is invalid and dropping it, which allows remote attackers to cause a denial of service (resource exhaustion) via a flood of malformed TCP packets without any flags set.
Platforms Affected:
- IBM SecureWay Firewall 4.2
- IBM SecureWay Firewall 4.2.1
Reported:
Oct 01, 2002
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