Support / Security / Advisories / Mandrakelinux 7.1 / MDKSA-2000:011

Package name: xlockmore
Date: 2000-06-04
Advisory ID: MDKSA-2000:011
Affected versions: 6.1 i586 , 7.0 i586 , 7.1 i586

Problem description

Xlock is an X11 utility used to lock X-Window displays until the password of the user running X is entered correctly. Of course, in order to perform the password-check xlock must be setuid root and have access to the shadowed passwd file. In the xlockmore distributions versions prior to 4.16.1, a buffer overflow vulnerability was present in xlock that permitted a user to view parts of the shadowed passwd file. This is achieved by overwriting (with an oversized -mode argument) a global variable storing a pointer to a string printed in the "usage" output. The pointer would be overwritten with an address pointing to the shadowed passwd data. With the long argument, xlock would find and an error in the command syntax and exit, printing the usage information (along with the shadowed passwd text).

Updated packages

6.1 i586

 614600a41689677da12287b950c2708a  6.1/RPMS/xlockmore-4.16.1-1mdk.i586.rpm
d0a6a3bf840b4d3ea347892f8df1896e  6.1/SRPMS/xlockmore-4.16.1-1mdk.src.rpm

7.0 i586

 82ea685b6c467a55fce37490286763ae  7.0/RPMS/xlockmore-4.16.1-1mdk.i586.rpm
d0a6a3bf840b4d3ea347892f8df1896e  7.0/SRPMS/xlockmore-4.16.1-1mdk.src.rpm

7.1 i586

 120ecc3f1ae12fd550c642fa47439a5f  7.1/RPMS/xlockmore-4.16.1-1mdk.i586.rpm
d0a6a3bf840b4d3ea347892f8df1896e  7.1/SRPMS/xlockmore-4.16.1-1mdk.src.rpm