Ultr@VNC MS-Logon weak encryption
|ultr@vnc-mslogon-weak-encryption (26283)||Low Risk|
Ultr@VNC (UltraVNC) uses a weak encryption algorithm when MS-Logon I and MS-Logon II authentication is used. A remote attacker could use a network sniffing tool to recover encrypted user passwords that can be easily decrypted and used to gain unauthorized access to the system.
Upgrade to the latest version of Ultr@VNC (1.0.2 or later), available from the Ultr@VNC Web site. See References.
- BugTraq Mailing List, Wed May 03 2006 - 01:40:40 CDT: Vulnerability in the way UltrVNC-1.0.1 handles MS-Logon Authentication..
- Ultr@VNC Web site: Ultr@VNC.
- BID-17824: UltraVNC Weak Challenge-Response Authentication Vulnerability
- CVE-2006-2206: The MS-Logon authentication scheme in UltraVNC (aka Ultr@VNC) 1.0.1 uses weak encryption (XOR) for challenge/response, which allows remote attackers to gain privileges by sniffing and decrypting passwords.
- OSVDB ID: 41277: Ultr@VNC MS-Logon Authentication Scheme Encryption Weakness
- Ultr@VNC Ultr@VNC 1.0.1 and prior
May 03, 2006
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