Vulnerability Name:

CVE-1999-0994 (CCN-3950)

Assigned:1999-12-16
Published:1999-12-16
Updated:2018-10-12
Summary:Windows NT with SYSKEY reuses the keystream that is used for encrypting SAM password hashes, allowing an attacker to crack passwords.
CVSS v3 Severity:5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-255
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-1999-0994

Source: CCN
Type: BindView RAZOR Security Advisory, December 16, 1999
Windows NT's SYSKEY feature

Source: MSKB
Type: UNKNOWN
Q248183

Source: CCN
Type: US-CERT VU#36764
Syskey reuses keystream

Source: CCN
Type: Microsoft Security Bulletin MS01-033
Unchecked Buffer in Index Server ISAPI Extension Could Enable Web Server Compromise

Source: CCN
Type: Microsoft Security Bulletin MS01-041
Malformed RPC Request Can Cause Service Failure

Source: CCN
Type: Microsoft Security Bulletin MS01-044
15 August 2001 Cumulative Patch for IIS

Source: CCN
Type: Microsoft Security Bulletin MS02-001
Trusting Domains Do Not Verify Domain Membership of SIDs in Authorization Data

Source: CCN
Type: Microsoft Security Bulletin MS02-018
Cumulative Patch for Internet Information Services (Q319733)

Source: CCN
Type: Microsoft Security Bulletin MS02-062
Cumulative Patch for Internet Information Service (Q327696)

Source: CCN
Type: Microsoft Security Bulletin MS03-018
Cumulative Patch for Internet Information Service (811114)

Source: CCN
Type: Microsoft Security Bulletin MS99-056
Patch Available for "Syskey Keystream Reuse" Vulnerability

Source: CCN
Type: OSVDB ID: 1165
NT SYSKEY Reused Keystream

Source: BID
Type: UNKNOWN
873

Source: CCN
Type: BID-873
NT Syskey Reused Keystream Vulnerability

Source: MS
Type: UNKNOWN
MS99-056

Source: XF
Type: UNKNOWN
nt-syskey-protection(3950)

Source: CCN
Type: Microsoft Knowledge Base Article 248183
Syskey Tool Reuses Keystream

Vulnerable Configuration:Configuration 1:
  • cpe:/o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_nt:4.0:*:server:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_nt:4.0:*:terminal_server:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_nt:4.0:sp1:*:*:enterprise:*:x86:*

    • Configuration CCN 1:
  • cpe:/o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    microsoft windows nt 4.0
    microsoft windows nt 4.0
    microsoft windows nt 4.0
    microsoft windows nt 4.0 sp1
    microsoft windows nt 4.0