RMC-100 (Standard): Improper Limitation of a Pathname to a Restricted Directory
CVE-2022-0902 is a critical-severity improper limitation of a pathname to a restricted directory vulnerability in RMC-100 (Standard) from ABB, 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 2105457-037 as the first without the flaw, so updating RMC-100 (Standard) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 16.9% chance of exploitation within 30 days, which is in the top 2.89% of all scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update RMC-100 (Standard) to 2105457-037 or a later version.
- Update RMC-100-LITE to 2106229-011 or a later version.
- Update XIO to 2106198-008 or a later version.
- Read the advisory on search.abb.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| ABB | RMC-100 (Standard) | before 2105457-037 | 2105457-037 |
| ABB | RMC-100-LITE | before 2106229-011 | 2106229-011 |
| ABB | XIO | before 2106198-008 | 2106198-008 |
| ABB | XFCG5 | before 2105805-016 | 2105805-016 |
| ABB | XRCG5 | before 2105864-016 | 2105864-016 |
| ABB | uFLOG5 | before 2105298-024 | 2105298-024 |
| ABB | UDC | before 2106177-007 | 2106177-007 |
| ABB | Rmc-100 Firmware | before 2105457-037 | 2105457-037 |
| ABB | Rmc-100-lite Firmware | before 2106229-011 | 2106229-011 |
| ABB | Xio Firmware | before 2106198-008 | 2106198-008 |
| ABB | Xfcg5 Firmware | before 2105805-016 | 2105805-016 |
| ABB | Xrcg5 Firmware | before 2105864-016 | 2105864-016 |
| ABB | Uflog5 Firmware | before 2105298-024 | 2105298-024 |
| ABB | Udc Firmware | before 2106177-007 | 2106177-007 |
Version data comes from the organisation that assigned the CVE. 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 system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.1 | High | CNA (ch.abb.com) |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability in flow computer and remote controller products of ABB ( RMC-100 (Standard), RMC-100-LITE, XIO, XFCG5 , XRCG5 , uFLOG5 , UDC) allows an attacker who successfully exploited this vulnerability could insert and run arbitrary code in an affected system node.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Limitation of a Pathname to a Restricted Directory
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
How developers prevent this class of flaw
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.
More Improper Limitation of a Pathname to a Restricted Directory vulnerabilities (CWE-22)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Recent Improper Limitation of a Pathname to a Restricted Directory vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 8.1 High severity
- 7.8 High severity
- 9.8 Critical severity
- 7.5 High severity
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