CVE-2021-31887
Description
A vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BACnet) (All versions), APOGEE MEC (PPC) (P2 Ethernet) (All versions), APOGEE PXC Compact (BACnet) (All versions < V3.5.4), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.4), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.19), Desigo PXC00-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC00-U (All versions >= V2.3 and < V6.30.016), Desigo PXC001-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC100-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC12-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC128-U (All versions >= V2.3 and < V6.30.016), Desigo PXC200-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC36.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC50-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC64-U (All versions >= V2.3 and < V6.30.016), Desigo PXM20-E (All versions >= V2.3 and < V6.30.016), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus Source Code (All versions), TALON TC Compact (BACnet) (All versions < V3.5.4), TALON TC Modular (BACnet) (All versions < V3.5.4). FTP server does not properly validate the length of the “PWD/XPWD” command, leading to stack-based buffer overflows. This may result in Denial-of-Service conditions and Remote Code Execution. (FSMD-2021-0016)
How to fix
- siemens nucleus_readystart_v32017.02.4 or later
- siemens apogee_pxc_compact_firmware2.8.19, 3.5.4 or later
- siemens apogee_pxc_modular_firmware2.8.19, 3.5.4 or later
- siemens talon_tc_compact_firmware3.5.4 or later
- siemens talon_tc_modular_firmware3.5.4 or later
- siemens desigo_pxc00-e.d_firmware6.30.016 or later
- siemens desigo_pxc00-u_firmware6.30.016 or later
- siemens desigo_pxc001-e.d_firmware6.30.016 or later
- siemens desigo_pxc12-e.d_firmware6.30.016 or later
- siemens desigo_pxc22-e.d_firmware6.30.016 or later
- siemens desigo_pxc22.1-e.d_firmware6.30.016 or later
- siemens desigo_pxc36.1-e.d_firmware6.30.016 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| siemens nucleus_net | No range specified | — |
| siemens nucleus_readystart_v3 | v < 2017.02.4 | 2017.02.4 |
| siemens nucleus_source_code | No range specified | — |
| siemens apogee_modular_building_controller_firmware | No range specified | — |
| siemens apogee_modular_equiment_controller_firmware | No range specified | — |
| siemens apogee_pxc_compact_firmware | v < 2.8.19, v < 3.5.4 | 2.8.19, 3.5.4 |
| siemens apogee_pxc_modular_firmware | v < 2.8.19, v < 3.5.4 | 2.8.19, 3.5.4 |
| siemens talon_tc_compact_firmware | v < 3.5.4 | 3.5.4 |
| siemens talon_tc_modular_firmware | v < 3.5.4 | 3.5.4 |
| siemens desigo_pxc00-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc00-u_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc001-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc12-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc22-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc22.1-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc36.1-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc50-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc64-u_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc100-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc128-u_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxc200-e.d_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
| siemens desigo_pxm20-e_firmware | 2.3 ≤ v < 6.30.016 | 6.30.016 |
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