MasterStudy LMS – WordPress LMS Plugin: Improper Privilege Management
CVE-2022-0441 is a critical-severity improper privilege management vulnerability in MasterStudy LMS – WordPress LMS Plugin, 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 2.7.6 as the first without the flaw, so updating MasterStudy LMS – WordPress LMS Plugin to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 85.3% chance of exploitation within 30 days, which is in the top 0.28% of all scored CVEs.
Exploitation in the next 30 days is more likely than not, according to EPSS.
What to do
- Update MasterStudy LMS – WordPress LMS Plugin to 2.7.6 or a later version.
- Update Masterstudy Lms to 2.7.6 or a later version.
- 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 |
|---|---|---|---|
| MasterStudy LMS – WordPress LMS Plugin | MasterStudy LMS – WordPress LMS Plugin | 2.7.6 up to, but not including, 2.7.6 | 2.7.6 |
| Stylemixthemes | Masterstudy Lms | before 2.7.6 | 2.7.6 |
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 | 9.8 | Critical | NVD |
| CVSS 2.0 | 7.5 | High | NVD |
Official description
The MasterStudy LMS WordPress plugin before 2.7.6 does to validate some parameters given when registering a new account, allowing unauthenticated users to register as an admin
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Privilege Management
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
How developers prevent this class of flaw
- Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.
More Improper Privilege Management vulnerabilities (CWE-269)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- plugins.trac.wordpress.org/changeset/2667195Third Party Advisory
Technical write-ups (may include proof of concept)
- wpscan.com/vulnerability/173c2efe-ee9c-4539-852f-c242b4f728edExploit, Third Party Advisory
Recent Improper Privilege Management vulnerabilities
- 9.8 Critical severity
- 7.8 High severity
- 7.8 High severity
- 7.2 High severity
- 9.8 Critical severity
- 8.8 High severity
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