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ppp-off.txt

ppp-off.txt
Posted Oct 19, 2000
Authored by Sinfony

Slackware Linux's ppp-off command uses /tmp insecurely by writing ps output to /tmp/grep.tmp, allowing an unprivileged user to overwrite any file as root.

tags | exploit, root
systems | linux, slackware
SHA-256 | 1e2516ab243a13e088be91f759a25f88ce099f7410487a4e595a22b99aeb688c

ppp-off.txt

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Hi,

In SlackWare Linux the script /usr/bin/ppp-off writes the output of 'ps x'
to /tmp/grep.tmp
Since root is the user that runs ppp-off, a non-privileged user could create
a link from /tmp/grep.tmp to any file (ie: /etc/issue), thus when root runs
the ppp-off script, the output of 'ps x' would be put in the linked file.
The fix would be to replace every instance of /tmp/grep.tmp in the ppp-off
script to something along the line of /root/grep.tmp

Take care,
sinfony

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