Heap-based buffer overflow in the BERDecBitString function in Microsoft ASN.1 library (MSASN1.DLL) allows remote attackers to execute arbitrary code via nested constructed bit strings, which leads to a realloc of a non-null pointer and causes the function to overwrite previously freed memory, as demonstrated using a SPNEGO token with a constructed bit string during HTTP authentication, and a different vulnerability than CVE-2003-0818. NOTE: the researcher has claimed that MS:MS04-007 fixes this issue.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Windows_2000 | Microsoft | * | * |
| Windows_2003_server | Microsoft | 64-bit (including) | 64-bit (including) |
| Windows_2003_server | Microsoft | r2 (including) | r2 (including) |
| Windows_nt | Microsoft | 4.0-sp6 (including) | 4.0-sp6 (including) |
| Windows_nt | Microsoft | 4.0-sp6a (including) | 4.0-sp6a (including) |
| Windows_xp | Microsoft | * | * |