Description (CNA)
BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. In 1.4.2, 1.5.0.rc2, and earlier, an off-by-one stack-based buffer overflow in the ubasic interpreter causes a crash (SIGABRT) when processing string literals longer than the buffer limit. The tokenizer_string function in src/bacnet/basic/program/ubasic/tokenizer.c incorrectly handles null termination for maximum-length strings. It writes a null byte to dest[40] when the buffer size is only 40 (indices 0-39), triggering a stack overflow.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| bacnet-stack / bacnet-stack | affected <= 1.4.2; affected >= 1.5.0.rc1, <= 1.5.0.rc2 |
CWE
CWE-193
References
- https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-pc83-wp6w-93mx
- https://github.com/bacnet-stack/bacnet-stack/pull/1196
- https://github.com/bacnet-stack/bacnet-stack/commit/4e1176394a5ae50d2fd0b5790d9bff806dc08465
ADP enrichment
No English description supplied.
No references supplied.