TightVNC Repeated Challenge Replay Attack Vulnerability

BID:5296

Info

TightVNC Repeated Challenge Replay Attack Vulnerability

Bugtraq ID: 5296
Class: Design Error
CVE: CVE-2002-1336
Remote: Yes
Local: No
Published: Jul 24 2002 12:00AM
Updated: Jul 11 2009 02:56PM
Credit: Discovered by [email protected].
Vulnerable: TightVNC TightVNC 1.2.5
+ Mandriva Linux Mandrake 9.0
TightVNC TightVNC 1.2.4
TightVNC TightVNC 1.2.3
TightVNC TightVNC 1.2.2
TightVNC TightVNC 1.2.1
TightVNC TightVNC 1.2 .0
Avaya Labs Libsafe 1.2.2
AT&T VNC 3.3.6
+ Gentoo Linux 1.4 _rc2
 + Gentoo Linux 1.4 _rc1
 AT&T VNC 3.3.5
AT&T VNC 3.3.4
AT&T VNC 3.3.3 R2
+ Conectiva Linux Enterprise Edition 1.0
+ Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2
+ Mandriva Linux Mandrake 8.1 ia64
 + Mandriva Linux Mandrake 8.1
+ Mandriva Linux Mandrake 8.0 ppc
 + Mandriva Linux Mandrake 8.0
- Redhat Linux 7.2 ia64
 - Redhat Linux 7.2 i686
 - Redhat Linux 7.2 i586
 - Redhat Linux 7.2 i386
 - Redhat Linux 7.2 alpha
 - Redhat Linux 7.2
- Redhat Linux 7.1 ia64
 - Redhat Linux 7.1 i686
 - Redhat Linux 7.1 i586
 - Redhat Linux 7.1 i386
 - Redhat Linux 7.1 alpha
 - Redhat Linux 7.1
- Redhat Linux 7.0 sparc
 - Redhat Linux 7.0 i686
 - Redhat Linux 7.0 i386
 - Redhat Linux 7.0 alpha
 - Redhat Linux 7.0
- Redhat Linux 6.2 sparc
 - Redhat Linux 6.2 i386
 - Redhat Linux 6.2 alpha
 - Redhat Linux 6.2
 + Sun Linux 5.0.7
+ Sun Linux 5.0
+ Sun LX50
AT&T VNC 3.3.3
- Apple Mac OS 9 9.0
- BSDI BSD/OS 4.0
- Debian Linux 2.2
- FreeBSD FreeBSD 4.2
- HP HP-UX 11.11
+ Mandriva Linux Mandrake 7.2
- Microsoft Windows 2000 Professional
- Microsoft Windows 98SE
- Microsoft Windows NT 4.0
 - OpenBSD OpenBSD 2.8
+ OpenBSD OpenBSD 2.0
- Redhat Linux 7.0
- Sun Solaris 8_sparc
 - Sun Solaris 7.0
 - SuSE Linux 7.0
Not Vulnerable: TightVNC TightVNC 1.2.6

Discussion

TightVNC Repeated Challenge Replay Attack Vulnerability

TightVNC is a Virtual Network Computing (VNC) client and server, available for a number of platforms including Microsoft Windows and Linux.

TightVNC, has been reported to repeat DES challenges if multiple connections are initiated in rapid sequence. A network eavesdropper may repeat a previously witnessed response, and authenticate as a valid user.

This behavior has been reported in version 1.2.1 of TightVNC for Unix. Other versions may share this vulnerability, this has not however been confirmed.

Exploit / POC

TightVNC Repeated Challenge Replay Attack Vulnerability

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

TightVNC Repeated Challenge Replay Attack Vulnerability

Solution:
Sun have released a security alert (Sun Alert ID:56161) to acknowledge this issue in Sun Linux 5. A workaround has been described in the workaround section of this BID to address this issue. Fixes are pending release. See referenced alert for further details.

Sun have made fixes available to address this issue in Sun Linux 5.0.7. Fixes are linked below.

Gentoo Linux has released an advisory. Users who have installed net-misc/vnc or net-misc/tightvnc are advised to upgrade by issuing the following commands:

emerge sync
emerge -u tightvnc
emerge clean

or

emerge sync
emerge -u vnc
emerge clean

Conectiva has released advisory CLA-2003:640 with fixes to address this issue. Security advisory CLSA-2003:670 has also been released containing a fix for CLEE 1.0, users are advised to upgrade as soon as possible.


TightVNC TightVNC 1.2 .0

TightVNC TightVNC 1.2.1

Avaya Labs Libsafe 1.2.2

TightVNC TightVNC 1.2.2

TightVNC TightVNC 1.2.3

TightVNC TightVNC 1.2.4

TightVNC TightVNC 1.2.5

AT&T VNC 3.3.3

AT&T VNC 3.3.3 R2

References

TightVNC Repeated Challenge Replay Attack Vulnerability

References:

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report