| 제목 | Open Source libzvbi 0.2.43 Integer Overflow -> Heap Overflow (vbi_search_new) |
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| 설명 | 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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| 사용자 | ninpwn (UID 82253) |
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| 제출 | 2025. 03. 03. AM 11:22 (1 년도 ago) |
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| 모더레이션 | 2025. 03. 11. AM 07:06 (8 days later) |
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| 상태 | 수락 |
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| VulDB 항목 | 299206 [libzvbi 까지 0.2.43 src/search.c vbi_search_new pat_len 메모리 손상] |
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| 포인트들 | 17 |
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