Description
TightVNC before 1.2.6 generates the same challenge string for multiple connections, which allows remote attackers to bypass VNC authentication by sniffing the challenge and response of other users.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tightvnc | 1.2.6-1 | — |
| Debian 13 | tightvnc | 1.2.6-1 | — |
| Debian 12 | tightvnc | 1.2.6-1 | — |
References
- vnc-weak-authentication(5992) vdb-entry
- RHSA-2002:287 vendor-advisory
- 20020724 VNC authentication weakness mailing-list
- RHSA-2003:041 vendor-advisory
- MDKSA-2003:022 vendor-advisory
- CLA-2003:640 vendor-advisory
- http://www.tightvnc.com/WhatsNew.txt
- 20020726 RE: VNC authentication weakness mailing-list
- 5296 vdb-entry