Description
Buffer overflow in the handle_packet function in mactelnet.c in the client in MAC-Telnet 0.4.3 and earlier allows remote TELNET servers to execute arbitrary code via a long string in an MT_CPTYPE_PASSSALT control packet.
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 | mactelnet | 0.4.4-4 | — |
| Debian 13 | mactelnet | 0.4.4-4 | — |
| Debian 12 | mactelnet | 0.4.4-4 | — |
| Debian 7 | mactelnet | 0.3.4-1+deb7u1 | DLA-639-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | mactelnet | No fix yet | — |
| Ubuntu 14.04 LTS | mactelnet | 0.4.0-1+deb8u1build0.14.04.1 | — |
Advisories 1
- DLA-639-1 mactelnet - security update Debian Security (DSA / DLA) · Mar 9, 2026