Remote code execution in Siemens APOGEE and TALON



Published: 2021-09-15
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-27391
CWE ID CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
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APOGEE MBC
Hardware solutions / Other hardware appliances

APOGEE MEC
Hardware solutions / Other hardware appliances

APOGEE PXC Compact (P2 Ethernet)
Hardware solutions / Other hardware appliances

APOGEE PXC Modular (P2 Ethernet)
Hardware solutions / Other hardware appliances

APOGEE PXC Compact (BACnet)
Hardware solutions / Other hardware appliances

APOGEE PXC Modular (BACnet)
Hardware solutions / Other hardware appliances

TALON TC Compact (BACnet)
Hardware solutions / Other hardware appliances

TALON TC Modular (BACnet)
Hardware solutions / Other hardware appliances

Vendor Siemens

Security Advisory

This security advisory describes one high risk vulnerability.

1) Buffer overflow

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] [PCI]

CVE-ID: CVE-2021-27391

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

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

CPE External links

https://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.



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