Summary
FastAsyncWorldEdit vulnerable to Uncontrolled Resource Consumption
Coordinated Disclosure Timeline
- 10.06.2023: Issue reported to IntellectualSites
- 11.06.2023: Issue is acknowledged
- 12.06.2023: Issue has been fixed
- 22.06.2023: Advisory has been published
Impacted version range
Before 2.6.3
Details
Proof of Concept
As a user, do the following:
- Select position 1 via
//pos1 - Select position 2 adding the "Infinity" keyword via
//pos2 Infinity - Execute any further operation.
The steps 1 and 2 are interchangeable.
CVE
- CVE-2023-35925
Credit
This issue was discovered and reported by @SuperMonis.
Workarounds
There is no direct mitigation besides updating FastAsyncWorldEdit to a patched version.
Additional Information
Users with access to the logs/ folder or shell access on their server can try to identify possible abuses of this issue by going through the logs.
To sieve through the data, you can use the regex query \/\/pos[12] Infinity, then investigate all log entries that return results.
Disclosure Policy
If you discover a security vulnerability within our software, please report the issue according to our vulnerability disclosure policy.
Impact
Such a task has a possibility of bringing the performing server down.
Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service. Typical impact: denial of service.
CVE-2023-35925 has a CVSS score of 6.2 (Medium). The vector is requires local access, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.6.3); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Already deployed Kodem?
See it in your environmentNew to Kodem? Get a demo →Remediation advice
On June 12, 2023, a patch, https://github.com/IntellectualSites/FastAsyncWorldEdit/pull/2285, has been merged addressing the vulnerability.
We strongly recommend users to update their version of FastAsyncWorldEdit to 2.6.3 as soon as possible.
Frequently Asked Questions
- What is CVE-2023-35925? CVE-2023-35925 is a medium-severity uncontrolled resource consumption vulnerability in com.fastasyncworldedit:FastAsyncWorldEdit-Core (maven), affecting versions < 2.6.3. It is fixed in 2.6.3. Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service.
- How severe is CVE-2023-35925? CVE-2023-35925 has a CVSS score of 6.2 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which packages are affected by CVE-2023-35925?
com.fastasyncworldedit:FastAsyncWorldEdit-Core(maven) (versions < 2.6.3)com.fastasyncworldedit:FastAsyncWorldEdit-Bukkit(maven) (versions < 2.6.3)
- Is there a fix for CVE-2023-35925? Yes. CVE-2023-35925 is fixed in 2.6.3. Upgrade to this version or later.
- Is CVE-2023-35925 exploitable, and should I be worried? Whether CVE-2023-35925 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2023-35925 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2023-35925?
- Upgrade
com.fastasyncworldedit:FastAsyncWorldEdit-Coreto 2.6.3 or later - Upgrade
com.fastasyncworldedit:FastAsyncWorldEdit-Bukkitto 2.6.3 or later
- Upgrade