CyberSecBulletin
CVE-2022-29873NVD status: Modified

SICAM T: Improper Neutralization of Parameter/Argument Delimiters

Published Updated By the CyberSecBulletin desk

CVE-2022-29873 is a critical-severity improper neutralization of parameter/argument delimiters vulnerability in SICAM T from Siemens, with a CVSS 3.1 base score of 9.8 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 V3.0 as the first without the flaw, so updating SICAM T to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.99% chance of exploitation within 30 days, higher than 81% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update SICAM T to V3.0 or a later version.
  2. Update 7kg8500-0aa00-0aa0 Firmware to 3.00 or a later version.
  3. Update 7kg8500-0aa00-2aa0 Firmware to 3.00 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
SiemensSICAM Tbefore V3.0V3.0
Siemens7kg8500-0aa00-0aa0 Firmwarebefore 3.003.00
Siemens7kg8500-0aa00-2aa0 Firmwarebefore 3.003.00
Siemens7kg8500-0aa10-0aa0 Firmwarebefore 3.003.00
Siemens7kg8500-0aa10-2aa0 Firmwarebefore 3.003.00
Siemens7kg8500-0aa30-0aa0 Firmwarebefore 3.003.00
Siemens7kg8500-0aa30-2aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa01-0aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa01-2aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa02-0aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa02-2aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa11-0aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa11-2aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa12-0aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa12-2aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa31-0aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa31-2aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa32-0aa0 Firmwarebefore 3.003.00
Siemens7kg8501-0aa32-2aa0 Firmwarebefore 3.003.00
Siemens7kg8550-0aa00-0aa0 Firmwarebefore 3.003.00
Siemens7kg8550-0aa00-2aa0 Firmwarebefore 3.003.00
Siemens7kg8550-0aa10-0aa0 Firmwarebefore 3.003.00
Siemens7kg8550-0aa10-2aa0 Firmwarebefore 3.003.00
Siemens7kg8550-0aa30-0aa0 Firmwarebefore 3.003.00
Siemens7kg8550-0aa30-2aa0 Firmwarebefore 3.003.00

Version data comes from the organisation that assigned the CVE; 12 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
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 4.09.3CriticalCNA (siemens.com)
CVSS 3.19.8CriticalCNA (siemens.com)
CVSS 3.19.8CriticalNVD
CVSS 2.07.5HighNVD

Official description

A vulnerability has been identified in SICAM T (All versions < V3.0). Affected devices do not properly validate parameters of certain GET and POST requests. This could allow an unauthenticated attacker to set the device to a denial of service state or to control the program counter and, thus, execute arbitrary code on the device.

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

The underlying weakness: Improper Neutralization of Parameter/Argument Delimiters

The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as parameter or argument delimiters when they are sent to a downstream component.

How developers prevent this class of flaw

  • Developers should anticipate that parameter/argument delimiters will be injected/removed/manipulated in the input vectors of their product. Use an appropriate combination of denylists and allowlists to ensure only valid, expected and appropriate input is processed by the system.
  • While it is risky to use dynamically-generated query strings, code, or commands that mix control and data together, sometimes it may be unavoidable. Properly quote arguments and escape any special characters within those arguments. The most conservative approach is to escape or filter all characters that do not pass an extremely strict allowlist (such as everything that is not alphanumeric or white space). If some special characters are still needed, such as white space, wrap each argument in quotes after the escaping/filtering step. Be careful of argument injection (CWE-88).
  • Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

More Improper Neutralization of Parameter/Argument Delimiters vulnerabilities (CWE-141)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in SICAM T

All SICAM T vulnerabilities

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