PT-2019-12815 · Bacnet · Bacnet Protocol Stack

Skarg · Published 2019-05-30 · Updated 2019-07-19 · CVE-2019-12480

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions BACnet Protocol Stack versions through 0.8.6

Description The issue is related to a segmentation fault that leads to a denial of service in the BACnet APDU Layer. This occurs due to a malformed DCC in AtomicWriteFile, AtomicReadFile, and DeviceCommunicationControl services. An unauthenticated remote attacker can cause a denial of service, resulting in the bacserv daemon crash, because of an invalid read in bacdcode.c during the parsing of alarm tag numbers.

Recommendations For BACnet Protocol Stack versions through 0.8.6, consider restricting access to the AtomicWriteFile, AtomicReadFile, and DeviceCommunicationControl services until a patch is available. As a temporary workaround, avoid using the bacdcode.c file for parsing alarm tag numbers until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2019-12480

Affected Products

Bacnet Protocol Stack

References · 10

• 🔥 https://sourceforge.net/p/bacnet/bugs/62 · Exploit
• 🔥 https://exploit-db.com/exploits/47148 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2019-12480 · Security Note
• https://osv.dev/vulnerability/CVE-2019-12480 · Vendor Advisory
• http://packetstormsecurity.com/files/153716/BACnet-Stack-0.8.6-Denial-Of-Service.html · Note
• https://sourceforge.net/p/bacnet/code/3224 · Note
• https://sourceforge.net/p/bacnet/code/3223 · Note
• https://1modm.github.io/CVE-2019-12480.html · Note
• https://sourceforge.net/p/bacnet/code/3220 · Note
• https://sourceforge.net/p/bacnet/code/3225 · Note