scponly -- local privilege escalation exploits

Description:

Max Vozeler reports:

If ALL the following conditions are true, administrators using scponly-4.1 or older may be at risk of a local privilege escalation exploit:

• the chrooted setuid scponlyc binary is installed
• regular non-scponly users have interactive shell access to the box
• a user executable dynamically linked setuid binary (such as ping) exists on the same file system mount as the user's home directory
• the operating system supports an LD_PRELOAD style mechanism to overload dynamic library loading

Pekka Pessi also reports:

If ANY the following conditions are true, administrators using scponly-4.1 or older may be at risk of a local privilege escalation exploit:

• scp compatibility is enabled
• rsync compatibility is enabled

References:

• URL: <https://lists.ccs.neu.edu/pipermail/scponly/2005-December/001027.html>
• URL: <http://sublimation.org/scponly/#relnotes>

Affects:

• scponly <4.2

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