2020-28400 | Siemens SCALANCE/SIMATIC DCP Reset Packet allocation of resources (ssa-599968)

By Max On Jul 16, 2021

CVSS Meta Temp Score	Current Exploit Price (≈)	CTI Interest Score
4.1	$0-$5k	0.54

A vulnerability has been found in Siemens SCALANCE and SIMATIC (SCADA Software) (affected version unknown) and classified as problematic. Affected by this vulnerability is an unknown functionality of the component DCP Reset Packet Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-770. As an impact it is known to affect availability. The summary by CVE is:

A vulnerability has been identified in Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller (All versions), Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200 (All versions), Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200P (All versions), RUGGEDCOM RM1224 (All Versions < 6.4), SCALANCE M-800 (All Versions < 6.4), SCALANCE S615 (All Versions < 6.4), SCALANCE W1700 IEEE 802.11ac (All versions), SCALANCE W700 IEEE 802.11n (All versions), SCALANCE X200-4 P IRT (All Versions < V5.5.0), SCALANCE X201-3P IRT (All Versions < V5.5.0), SCALANCE X201-3P IRT PRO (All Versions < V5.5.0), SCALANCE X202-2 IRT (All Versions < V5.5.0), SCALANCE X202-2P IRT (incl. SIPLUS NET variant) (All Versions < V5.5.0), SCALANCE X202-2P IRT PRO (All Versions < V5.5.0), SCALANCE X204 IRT (All Versions < V5.5.0), SCALANCE X204 IRT PRO (All Versions < V5.5.0), SCALANCE X204-2 (incl. SIPLUS NET variant) (All versions), SCALANCE X204-2FM (All versions), SCALANCE X204-2LD (incl. SIPLUS NET variant) (All versions), SCALANCE X204-2LD TS (All versions), SCALANCE X204-2TS (All versions), SCALANCE X206-1 (All versions), SCALANCE X206-1LD (incl. SIPLUS NET variant) (All versions), SCALANCE X208 (incl. SIPLUS NET variant) (All versions), SCALANCE X208PRO (All versions), SCALANCE X212-2 (All versions), SCALANCE X212-2LD (All versions), SCALANCE X216 (All versions), SCALANCE X224 (All versions), SCALANCE X302-7EEC (All versions), SCALANCE X304-2FE (All versions), SCALANCE X306-1LDFE (All versions), SCALANCE X307-2EEC (All versions), SCALANCE X307-3 (All versions), SCALANCE X307-3LD (All versions), SCALANCE X308-2 (incl. SIPLUS NET variant) (All versions), SCALANCE X308-2LD (All versions), SCALANCE X308-2LH (All versions), SCALANCE X308-2LH+ (All versions), SCALANCE X308-2M (All versions), SCALANCE X308-2M POE (All versions), SCALANCE X308-2M TS (All versions), SCALANCE X310 (All versions), SCALANCE X310FE (All versions), SCALANCE X320-1FE (All versions), SCALANCE X320-3LDFE (All versions), SCALANCE XB-200 (All versions), SCALANCE XC-200 (All versions), SCALANCE XF-200BA (All versions), SCALANCE XF201-3P IRT (All Versions < V5.5.0), SCALANCE XF202-2P IRT (All Versions < V5.5.0), SCALANCE XF204 (All versions), SCALANCE XF204 IRT (All Versions < V5.5.0), SCALANCE XF204-2 (incl. SIPLUS NET variant) (All versions), SCALANCE XF204-2BA IRT (All Versions < V5.5.0), SCALANCE XF206-1 (All versions), SCALANCE XF208 (All versions), SCALANCE XM400 (All versions < V6.3.1), SCALANCE XP-200 (All versions), SCALANCE XR-300WG (All versions), SCALANCE XR324-12M (All versions), SCALANCE XR324-12M TS (All versions), SCALANCE XR324-4M EEC (All versions), SCALANCE XR324-4M POE (All versions), SCALANCE XR324-4M POE TS (All versions), SCALANCE XR500 (All versions < V6.3.1), SIMATIC CFU PA (All versions), SIMATIC IE/PB-LINK V3 (All versions), SIMATIC MV500 family (All versions < V3.0), SIMATIC NET CM 1542-1 (All versions), SIMATIC NET CP1616/CP1604 (All Versions >= V2.7), SIMATIC NET CP1626 (All versions), SIMATIC NET DK-16xx PN IO (All Versions >= V2.7), SIMATIC PROFINET Driver (All versions), SIMATIC Power Line Booster PLB, Base Module (MLFB: 6ES7972-5AA10-0AB0) (All versions), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All Versions < V4.5), SIMOCODE proV Ethernet/IP (All versions < V1.1.3), SIMOCODE proV PROFINET (All versions < V2.1.3), SOFTNET-IE PNIO (All versions). Affected devices contain a vulnerability that allows an unauthenticated attacker to trigger a denial-of-service condition. The vulnerability can be triggered if a large amount of DCP reset packets are sent to the device.

The weakness was published 07/13/2021 as ssa-599968. It is possible to read the advisory at cert-portal.siemens.com. This vulnerability is known as CVE-2020-28400 since 11/10/2020. The attack can only be done within the local network. The exploitation doesn’t need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/16/2021). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

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VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍