Overview
A critical vulnerability, identified as CVE-2025-58750, has been discovered in the rAthena, an open-source, cross-platform massively multiplayer online role-playing game (MMORPG) server. This vulnerability, if exploited, could potentially lead to system compromise or data leakage. Given the popularity of MMORPGs and the widespread use of rAthena, the impact of this vulnerability could affect a significant number of users and systems. It is therefore essential to understand this vulnerability and take the necessary measures to mitigate its impact.
Vulnerability Summary
CVE ID: CVE-2025-58750
Severity: High (8.2 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
rAthena | Versions prior to commit 0cc348b
How the Exploit Works
This vulnerability resides in the lack of a bound check in the `chclif_parse_moveCharSlot` function. This function does not properly validate the user-supplied input, which results in an out-of-bounds read/write condition. An attacker could exploit this vulnerability by sending specially crafted data to the server, which could then result in the reading or writing of data out of bounds, potentially leading to system compromise or data leakage.
Conceptual Example Code
The following shows a
conceptual
example of how this vulnerability might be exploited using a malformed packet:
POST /chclif_parse_moveCharSlot HTTP/1.1
Host: target.example.com
Content-Type: application/octet-stream
{ "user_input": "OVERLY_LONG_STRING_THAT_CAUSES_AN_OUT_OF_BOUNDS_READ_WRITE" }This is a
conceptual
example and may not reflect the exact method of exploitation.
Impact
A successful exploit of this vulnerability could allow an attacker to compromise the system running the rAthena server or potentially leak sensitive data. As the rAthena server is used for hosting MMORPGs, such an attack could disrupt the online gaming experience for numerous players and potentially expose their data.
Recommendations
Users of the affected versions of rAthena are advised to immediately apply the vendor patch provided in commit 0cc348b. If updating is not immediately possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation against potential exploitation. However, these should not be considered as long-term solutions. Regular patching and system updates remain the most effective defense against such vulnerabilities.
