CyberSecBulletin
CVE-2022-43767NVD status: Modified

SIMATIC CP 1242-7 V2: Deadlock

Published Updated By the CyberSecBulletin desk

CVE-2022-43767 is a high-severity deadlock vulnerability in SIMATIC CP 1242-7 V2 from Siemens, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version V3.4.29 as the first without the flaw, so updating SIMATIC CP 1242-7 V2 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.72% chance of exploitation within 30 days, higher than 55% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update SIMATIC CP 1242-7 V2 to V3.4.29 or a later version.
  2. Update SIMATIC CP 1243-1 to V3.4.29 or a later version.
  3. Update SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) to V3.4.29 or a later version.
  4. Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
SiemensSIMATIC CP 1242-7 V2before V3.4.29; all versionsV3.4.29
SiemensSIMATIC CP 1243-1before V3.4.29; all versionsV3.4.29
SiemensSIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants)before V3.4.29V3.4.29
SiemensSIMATIC CP 1243-1 IEC (incl. SIPLUS variants)before V3.4.29V3.4.29
SiemensSIMATIC CP 1243-7 LTE EUbefore V3.4.29; all versionsV3.4.29
SiemensSIMATIC CP 1243-7 LTE USbefore V3.4.29; all versionsV3.4.29
SiemensSIMATIC CP 1243-8 IRCbefore V3.4.29; all versionsV3.4.29
SiemensSIMATIC CP 1542SP-1before V2.3; before 2.3V2.3, 2.3
SiemensSIMATIC CP 1542SP-1 IRCbefore V2.3; before 2.3V2.3, 2.3
SiemensSIMATIC CP 1543SP-1before V2.3; before 2.3V2.3, 2.3
SiemensSIMATIC CP 443-1before V3.3; before 3.3V3.3, 3.3
SiemensSIMATIC CP 443-1 Advancedbefore V3.3; before 3.3V3.3, 3.3
SiemensSIPLUS ET 200SP CP 1542SP-1 IRC TX RAILbefore V2.3; before 2.3V2.3, 2.3
SiemensSIPLUS ET 200SP CP 1543SP-1 ISECbefore V2.3; before 2.3V2.3, 2.3
SiemensSIPLUS ET 200SP CP 1543SP-1 ISEC TX RAILbefore V2.3; before 2.3V2.3, 2.3
SiemensSIPLUS NET CP 1242-7 V2before V3.4.29; all versionsV3.4.29
SiemensSIPLUS NET CP 443-1before V3.3; before 3.3V3.3, 3.3
SiemensSIPLUS NET CP 443-1 Advancedbefore V3.3; before 3.3V3.3, 3.3
SiemensSIPLUS S7-1200 CP 1243-1before V3.4.29; all versionsV3.4.29
SiemensSIPLUS S7-1200 CP 1243-1 RAILbefore V3.4.29; all versionsV3.4.29
SiemensSIPLUS TIM 1531 IRCbefore V2.3.6; before 2.3.6V2.3.6, 2.3.6
SiemensTIM 1531 IRCbefore V2.3.6; before 2.3.6V2.3.6, 2.3.6
Siemenssimatic_cp_1243-1_dnp3all versionsNot stated
Siemenssimatic_cp_1243-1_iecall versionsNot stated
SiemensSimatic Cp 1242-7 V2 FirmwareNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE; 23 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (siemens.com).

Official description

A vulnerability has been identified in SIMATIC CP 1242-7 V2 (6GK7242-7KX31-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-1 (6GK7243-1BX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) (All versions < V3.4.29), SIMATIC CP 1243-1 IEC (incl. SIPLUS variants) (All versions < V3.4.29), SIMATIC CP 1243-7 LTE EU (6GK7243-7KX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-7 LTE US (6GK7243-7SX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) (All versions < V2.3), SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) (All versions < V2.3), SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) (All versions < V2.3), SIMATIC CP 443-1 (6GK7443-1EX30-0XE0) (All versions < V3.3), SIMATIC CP 443-1 (6GK7443-1EX30-0XE1) (All versions < V3.3), SIMATIC CP 443-1 Advanced (6GK7443-1GX30-0XE0) (All versions < V3.3), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) (All versions < V2.3), SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) (All versions < V2.3), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) (All versions < V2.3), SIPLUS NET CP 1242-7 V2 (6AG1242-7KX31-7XE0) (All versions < V3.4.29), SIPLUS NET CP 443-1 (6AG1443-1EX30-4XE0) (All versions < V3.3), SIPLUS NET CP 443-1 Advanced (6AG1443-1GX30-4XE0) (All versions < V3.3), SIPLUS S7-1200 CP 1243-1 (6AG1243-1BX30-2AX0) (All versions < V3.4.29), SIPLUS S7-1200 CP 1243-1 RAIL (6AG2243-1BX30-1XE0) (All versions < V3.4.29), SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) (All versions < V2.3.6), TIM 1531 IRC (6GK7543-1MX00-0XE0) (All versions < V2.3.6). The webserver of the affected products contains a vulnerability that may lead to a denial of service condition. An attacker may cause a denial of service situation of the webserver of the affected product.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Deadlock

The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock.

More Deadlock vulnerabilities (CWE-833)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in SIMATIC CP 1242-7 V2

All SIMATIC CP 1242-7 V2 vulnerabilities

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