Description
ldm in Linux Terminal Server Project (LTSP) 0.99 and 2 passes the -ac option to the X server on each LTSP client, which allows remote attackers to connect to this server via TCP port 6006 (aka display :6).
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 | ltsp | 5.0.40~bzr20071229-1 | — |
| Debian 13 | ltsp | 5.0.40~bzr20071229-1 | — |
| Debian 12 | ltsp | 5.0.40~bzr20071229-1 | — |
| Debian 5.0 | ldm | 2:0.1~bzr20071217-1+lenny1 | DTSA-118-1 |
| Debian 4.0 | ltsp | 0.99debian11+etch1 | DSA-1561-1 |
Advisories 2
- DSA-1561-1 ltsp - information disclosure Debian Security (DSA / DLA) · Mar 9, 2026
- DTSA-118-1 ldm - authentication bypass Debian Security (DSA / DLA) · Mar 9, 2026
References
- [oss-security] 20080312 Re: CVE request: insecure X11 handling in ltsp mailing-list
- 1019940 vdb-entry
- [oss-security] 20080311 CVE request: insecure X11 handling in ltsp mailing-list
- USN-610-1 vendor-advisory
- 28960 vdb-entry
- 30099 third-party-advisory
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=469462
- DSA-1561 vendor-advisory
- 29959 third-party-advisory
- ltsp-ldm-weak-security(42080) vdb-entry