Remote code execution in Siemens APOGEE and TALON

1) Buffer overflow

EUVDB-ID: #VU56616

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-27391

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when parsing specific requests. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

APOGEE MBC: 2.6.3

APOGEE MEC: 2.6.3

APOGEE PXC Compact (P2 Ethernet): 2.8

APOGEE PXC Modular (P2 Ethernet): 2.8

APOGEE PXC Compact (BACnet): before 3.5.3

APOGEE PXC Modular (BACnet): before 3.5.3

TALON TC Compact (BACnet): before 3.5.3

TALON TC Modular (BACnet): before 3.5.3

External links

http://cert-portal.siemens.com/productcert/pdf/ssa-944498.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.