A vulnerability was identified in the kjd/idna library, specifically within the `idna.encode()` function, affecting version 3.6. This vulnerability allows crafted input strings to lead to quadratic complexity, resulting in a denial of service condition. The issue arises from the function's handling of such inputs that significantly increases the processing time in a quadratic manner relative to the input size. Organizations should prioritize patching immediately.
The severity of this vulnerability is classified as high, with a CVSS score of 7.5. This level of severity indicates that the risk to organizations includes potential service interruptions and degraded performance due to excessive processing times caused by the vulnerability. Therefore, it is critical for affected organizations to address this issue promptly.
Currently, there is no known exploit for this vulnerability, but its impact on availability makes it essential for organizations to remain vigilant. The vulnerability affects the kjd technology stack, specifically the internationalized domain names in applications component.
Organizations should address this vulnerability in their priority patch cycle to avoid potential denial of service scenarios. This proactive approach will help maintain system integrity and availability.
Vulnerability Details
The vulnerability in question arises from the handling of crafted input strings by the `idna.encode()` function in the kjd/idna library. The handling flaw can cause significant computational load, leading to denial of service. The CVSS score of 7.5 indicates a high severity level with implications on availability. The affected product is kjd's internationalized domain names in applications, specifically version 3.6, which was published on July 7, 2024.
Technical Analysis
The root cause of this vulnerability lies in the `idna.encode()` function's improper handling of crafted input strings. The attack vector is network-based, and the attack complexity is low, requiring no privileges or user interaction. Consequently, this vulnerability can be exploited by an unauthenticated attacker through crafted input, causing a significant impact on availability.
Risk & Impact Analysis
The risk to organizations includes potential denial of service due to the vulnerability's quadratic complexity. The blast radius could affect any service utilizing the kjd/idna library, leading to resource exhaustion and downtime. Given its high severity and impact on availability, organizations should assess their exposure and address this vulnerability in their patch management processes.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch (3.7) are affected. Organizations using version 3.6 of the kjd/idna library must upgrade to version 3.7 to mitigate this vulnerability.
Mitigation & Remediation
Organizations should upgrade to version 3.7 of the kjd/idna library to remediate this vulnerability. If an upgrade is not feasible, consider implementing network controls to limit access to services using the vulnerable library. Additionally, monitoring for unusual processing times can help identify potential exploitation attempts.
Detection Guidance
Monitor logs for indicators of high processing times associated with the `idna.encode()` function. Look for unusual patterns in input strings that may indicate an attempt to exploit this vulnerability. Implement behavioral anomaly detection to identify potential misuse.
AppSecure Threat Intelligence Insight
Long-term significance of this vulnerability suggests a need for organizations to assess their use of third-party libraries carefully. This incident highlights the importance of maintaining an updated and secure software supply chain. Security teams should enhance their vulnerability management programs to ensure timely updates and patches.
For further reading, organizations can refer to our guide on vulnerability management programs and consider incorporating penetration testing as a proactive measure to identify similar weaknesses in the future.
Security teams should remain vigilant and continuously assess their systems for vulnerabilities, especially those that could lead to denial of service, as seen with this case.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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