CVE-2020-27736
Description
A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS domain name label parsing functionality does not properly validate the null-terminated name in DNS-responses. The parsing of malformed responses could result in a read past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition or leak the read memory.
How to fix
- siemens nucleus_readystart_v32017.02.3 or later
- siemens nucleus_readystart_v44.1.0 or later
- siemens simotics_connect_400_firmware0.5.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| siemens nucleus_net | No range specified | — |
| siemens nucleus_readystart_v3 | v < 2017.02.3 | 2017.02.3 |
| siemens nucleus_readystart_v4 | v < 4.1.0 | 4.1.0 |
| siemens nucleus_source_code | No range specified | — |
| siemens simotics_connect_400_firmware | v < 0.5.0.0 | 0.5.0.0 |
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