EasyBuilder Pro cMT: Improper Limitation of a Pathname to a Restricted Directory
CVE-2023-0104 is a high-severity improper limitation of a pathname to a restricted directory vulnerability in EasyBuilder Pro cMT from Weintek, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected EasyBuilder Pro cMT versions: 6.07.01 and earlier; 6.07.02.479 and earlier; 6.08.01.349 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 21.8% chance of exploitation within 30 days, which is in the top 2.32% of all scored CVEs.
EPSS places it among the vulnerabilities most likely to be exploited soon.
What to do
- Update Easybuilder Pro to 6.07.02.480 or 6.08.01.350, whichever matches your release line, or a later version.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Weintek | EasyBuilder Pro cMT | 6.07.01 and earlier; 6.07.02.479 and earlier; 6.08.01.349 and earlier | Not stated |
| Weintek | Easybuilder Pro | before 6.07.02.480; 6.08.01.190 up to, but not including, 6.08.01.350 | 6.07.02.480, 6.08.01.350 |
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
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- 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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.3 | Critical | CNA (hq.dhs.gov) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
The listed versions for Weintek EasyBuilder Pro are vulnerable to a ZipSlip attack caused by decompiling a malicious project file. This may allow an attacker to gain control of the user’s computer or gain access to sensitive data.
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.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- cisa.gov/uscert/ics/advisories/icsa-23-045-01Third Party Advisory, US Government Resource
Recent Improper Limitation of a Pathname to a Restricted Directory vulnerabilities
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.8 High severity
- 8.1 High severity
- 8.8 High severity
Spotted an error? Tell us.