Description
BACnet Protocol Stack through 0.8.6 has a segmentation fault leading to denial of service in BACnet APDU Layer because a malformed DCC in AtomicWriteFile, AtomicReadFile and DeviceCommunicationControl services. An unauthenticated remote attacker could cause a denial of service (bacserv daemon crash) because there is an invalid read in bacdcode.c during parsing of alarm tag numbers.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- BACnet Stack 0.8.6 - Denial of Service EDB-47148 · dos · Jul 22, 2019
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://sourceforge.net/p/bacnet/bugs/62/
- https://sourceforge.net/p/bacnet/code/3220
- https://sourceforge.net/p/bacnet/code/3223
- https://sourceforge.net/p/bacnet/code/3224
- https://sourceforge.net/p/bacnet/code/3225
- http://packetstormsecurity.com/files/153716/BACnet-Stack-0.8.6-Denial-Of-Service.html
- https://1modm.github.io/CVE-2019-12480.html