| tiêu đề | Open Source libzvbi 0.2.43 Integer Overflow -> Heap Overflow (vbi_search_new) |
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| Mô tả | The function vbi_search_new attempts to find a pattern in a passed string, it takes pat_len which is user controlled as the argument for malloc while performing an arithmetic operation in the call without checking any bounds, ultimately could result in a minimum sized chunk allocation.
if (!regexp) { // user controlled, set to False
if (!(esc_pat = malloc(sizeof(ucs2_t) * pat_len * 2))) { // integer overflow -> under allocation, pat_len is user controlled
free(s);
return NULL;
}
for (i = j = 0; i < pat_len; i++) {
if (strchr("!\"#$%&()*+,-./:;=?@[\\]^_{|}~", pattern[i]))
esc_pat[j++] = '\\';
esc_pat[j++] = pattern[i]; /* effectively can be written to 'everywhere' on the heap starting from esc_pat
*/
}
pattern = esc_pat;
pat_len = j;
} |
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| Người dùng | ninpwn (UID 82253) |
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| Đệ trình | 03/03/2025 11:22 (cách đây 1 Năm) |
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| Kiểm duyệt | 11/03/2025 07:06 (8 days later) |
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| Trạng thái | được chấp nhận |
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| Mục VulDB | 299206 [libzvbi đến 0.2.43 src/search.c vbi_search_new pat_len tràn bộ đệm] |
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| điểm | 17 |
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