CVE-2021-27391 Memory corruption in APOGEE MBC (PPC) (P2 Ethernet)
Unauthenticated remote attackers can execute arbitrary code with root privileges via a buffer overflow in the web server's Host parameter parsing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-27391?
CVE-2021-27391 is a critical memory corruption vulnerability in Siemens APOGEE MBC (PPC) (P2 Ethernet), published on 14 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in APOGEE MBC (PPC) (P2 Ethernet) (All versions >= V2.6.3), APOGEE MEC (PPC) (P2 Ethernet) (All versions >= V2.6.3), APOGEE PXC Compact (BACnet) (All versions < V3.5.3), APOGEE PXC Compact (P2 Ethernet) (All versions >= V2.8), APOGEE PXC Modular (BACnet) (All versions < V3.5.3), APOGEE PXC Modular (P2 Ethernet) (All versions >= V2.8), TALON TC Compact (BACnet) (All versions < V3.5.3), TALON TC Modular (BACnet) (All versions < V3.5.3). The web server of affected devices lacks proper bounds checking when parsing the Host parameter in HTTP requests, which could lead to a buffer overflow. An unauthenticated remote attacker could exploit this vulnerability to execute arbitrary code on the device with root privileges.
Weakness: CWE-120
Which versions are affected by CVE-2021-27391?
It affects 8 products.
Products include Siemens Apogee Mbc \(Ppc\) \(P2 Ethernet\) Firmware, Siemens Apogee Mec \(Ppc\) \(P2 Ethernet\) Firmware, Siemens Apogee Pxc Bacnet Automation Controller Firmware, Siemens Apogee Pxc Compact \(P2 Ethernet\) Firmware, Siemens Apogee Pxc Modular \(Bacnet\) Firmware, Siemens Apogee Pxc Modular \(P2 Ethernet\) Firmware and 2 more.
How do I fix CVE-2021-27391?
No fix has been published for CVE-2021-27391 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-27391 being exploited?
There is no known exploitation of CVE-2021-27391 in the wild and no public exploit code.
Sources
Also known as GHSA-98pm-v23p-r2wf.