cbcvebase.
CVE-2004-0120
published 2004-06-01

CVE-2004-0120: The Microsoft Secure Sockets Layer (SSL) library, as used in Windows 2000, Windows XP, and Windows Server 2003, allows remote attackers to cause a denial of…

PriorityP431medium5CVSS 2.0
AVNACLAuNCNINAP
EXPLOIT
EPSS
55.58%
98.9th percentile
The Microsoft Secure Sockets Layer (SSL) library, as used in Windows 2000, Windows XP, and Windows Server 2003, allows remote attackers to cause a denial of service via malformed SSL messages.

Affected

1 ranges
VendorProductVersion rangeFixed in
microsoftwindows_2003_server——

Detection & IOCsextracted from sources · hover to see the quote

bytes↗
16 03 00 03 B8 01 00 03 B4 00 03 B1 00 03 AE
bytes↗
00 39 00 38 00 35 00 16 00 13 00 0A 00 33 00 32 00 2F 00 66 00 05 00 04 00 63 00 62 00 61 00 15 00 12 00 09 00 65 00 64 00 60 00 14 00 11 00 08 00 06 00 03
  • →The exploit sends a malformed SSL/TLS handshake to the target. Detection should look for a TCP connection on the SSL port followed by a ClientHello and then a large (~1308-byte) malformed handshake record starting with bytes 0x16 0x03 0x00 0x03 0xB8, which is an oversized TLS Handshake record (content type 0x16, version 0x03 0x00, length 0x03B8). ↗
  • →The exploit targets Microsoft IIS 5.0 with SSL enabled. The attack is a two-stage sequence: first a valid SSL/TLS ClientHello is sent, then a malformed 'bomb' payload is written to the same connection. Network detection should alert on the specific malformed record following a completed ClientHello exchange. ↗
  • →The exploit supports both SSL (version bytes 0x03 0x00) and TLS (version bytes 0x03 0x01) modes. In TLS mode, bin_data[2] is patched to 0x01. Detection rules should cover both SSL 3.0 (0x03 0x00) and TLS 1.0 (0x03 0x01) variants of the malformed record. ↗
  • ·The exploit targets IIS 5.0 with SSL specifically; the CVE also affects Windows 2000, Windows XP, and Windows Server 2003 SSL libraries more broadly, so the attack surface is not limited to IIS. ↗
  • ·The target port is user-supplied at runtime and is not hardcoded to 443; detection rules should not be limited to port 443 alone but should cover any port where SSL/TLS is served. ↗
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