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CVE-2005-0688
published 2005-03-05

CVE-2005-0688: Windows Server 2003 and XP SP2, with Windows Firewall turned off, allows remote attackers to cause a denial of service (CPU consumption) via a TCP packet with…

PriorityP431medium5CVSS 2.0
AVNACLAuNCNINAP
EXPLOIT
EPSS
47.44%
98.7th percentile
Windows Server 2003 and XP SP2, with Windows Firewall turned off, allows remote attackers to cause a denial of service (CPU consumption) via a TCP packet with the SYN flag set and the same destination and source address and port, aka a reoccurrence of the "Land" vulnerability (CVE-1999-0016).

Affected

6 ranges
VendorProductVersion rangeFixed in
microsoftwindows_2003_server
microsoftwindows_2003_server
microsoftwindows_2003_server
microsoftwindows_2003_server
microsoftwindows_2003_server
microsoftwindows_2003_server

Detection & IOCsextracted from sources · hover to see the quote

commandTCP packet with SYN flag set, same source and destination IP address and port (Land attack)
commandIP->ip_hl = 5 + (IPOPTS_MAX / 4); /* 60 byte header */ with IPOPTS_MAX=40
  • Detect Land attack packets: TCP SYN where source IP == destination IP AND source port == destination port targeting Windows XP SP2 / Server 2003 hosts with Windows Firewall disabled.
  • The Land attack PoC (exploit-db 861) sends a single raw TCP/IP packet with IP_DF set, TTL=255, and identical source/destination address and port; a single such packet is claimed sufficient to cause DoS ('Remote machine should be down').
  • ·The Land attack (CVE-2005-0688) only affects Windows XP SP2 and Windows Server 2003 when the Windows Firewall is turned OFF; hosts with the firewall enabled are not vulnerable.
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