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atermBad.txt

atermBad.txt
Posted Jul 14, 2004
Authored by Maarten Tielemans

Aterm version 0.4.2 has a tty permission weakness that allows the world to write to a terminal.

tags | advisory
SHA-256 | f60187f4e1ea1f4d37e926cb178bb4659cd176a856814c8fbdfc5c6d8186f4ec

atermBad.txt

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Aterm has an issue with creating a terminal.



A quick ‘ls –al’ on a aterm with ‘mesg y’ shows:

crw--w--w- 1 alsdk users 5, 3 Jul 13 17:27 /dev/ttyp3

with ‘mesg n’:

crw-----w- 1 alsdk users 5, 3 Jul 13 17:28 /dev/ttyp3



1) World (nobody) is able to ‘echo’ or ‘cat’ towards the terminal

echo “hello” >> /dev/ttyp3

cat mkdir >> /dev/ttyp3

2) The group seems to be incorrect, a normal terminal has default group tty



A xterm with ‘mesg y’ shows :

crw--w---- 1 ttielu tty 5, 5 Jul 13 17:27 ttyp5

and with ‘mesg n’ :

crw------- 1 ttielu tty 5, 5 Jul 13 17:27 ttyp5



Advice: use xterm



Bug found by TTIelu, reverse engineered by alsdk and TTIelu
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