An issue was discovered in ECCurve.java and ECCurve.cs in Bouncy Castle Java (BC Java) before 1.78, BC Java LTS before 2.73.6, BC-FJA before 1.0.2.5, and BC C# .Net before 2.3.1. Importing an EC certificate with crafted F2m parameters can lead to excessive CPU consumption during the evaluation of the curve parameters. This vulnerability is classified as high severity, with a CVSS score of 7.5. It poses a significant risk to organizations as it can lead to denial-of-service conditions through resource exhaustion.
Given the potential for excessive CPU consumption, it is critical for organizations utilizing Bouncy Castle libraries to prioritize patching immediately. The high severity of this vulnerability necessitates prompt action to mitigate any risks associated with its exploitation.
Currently, there is no known public exploit for this vulnerability, and it has not been included in the Known Exploited Vulnerabilities (KEV) catalog. However, the exploitability score indicates a high potential for exploitation, which should be a concern for all users of the affected libraries.
Organizations should take immediate steps to assess their usage of Bouncy Castle libraries and apply the necessary updates to prevent any potential impacts from this vulnerability.
Vulnerability Details
The vulnerability affects Bouncy Castle libraries, specifically ECCurve.java and ECCurve.cs, which are integral components in handling EC certificates. The vulnerability allows an attacker to exploit crafted F2m parameters, leading to excessive CPU consumption during curve parameter evaluation. This can significantly impact service availability.
The CVSS score for this vulnerability is 7.5, indicating a high severity level. The attack vector is classified as network-based, with low attack complexity, requiring no privileges or user interaction. The availability impact is rated as high, while confidentiality and integrity impacts are rated as none.
This vulnerability has been classified under CWE-125, which pertains to out-of-bounds read vulnerabilities. It is crucial for organizations to be aware of the potential impact of this vulnerability on their applications.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of EC certificates within the Bouncy Castle libraries. When an attacker crafts F2m parameters and imports them, the libraries may enter a state that leads to excessive CPU consumption.
The attack vector is network-based, allowing remote attackers to exploit this vulnerability without physical access to the target system. The attack complexity is low, meaning that even a basic understanding of the vulnerability can lead to a successful exploit.
No privileges are required to exploit this vulnerability, and user interaction is not necessary. The lack of prerequisites makes this vulnerability particularly concerning as it can be exploited easily.
The primary impact of this vulnerability is on availability. Attackers may leverage this flaw to consume system resources, leading to denial-of-service scenarios, which can disrupt services and affect business operations.
Risk & Impact Analysis
Risk to organizations includes the potential for denial-of-service conditions resulting from excessive CPU consumption. This could lead to significant downtime, affecting both internal operations and customer-facing services. The availability impact is critical, and organizations must assess the potential blast radius of this vulnerability.
Given the CVSS score of 7.5, organizations should address this vulnerability in priority patch cycles. The exploitability score is high, indicating that there is a significant risk of exploitation. Security teams should prioritize this vulnerability to mitigate risks effectively.
Organizations are encouraged to schedule remediation as soon as possible and implement monitoring solutions to detect any potential exploitation attempts. The urgency for remediation cannot be overstated, as the impact of a successful exploit could be severe.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include Bouncy Castle Java (BC Java) before 1.78, BC Java LTS before 2.73.6, BC-FJA before 1.0.2.5, and BC C# .Net before 2.3.1. Organizations should ensure that they are running the latest versions of these libraries to mitigate the risk associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching Bouncy Castle libraries to versions that address this vulnerability. Specific versions to upgrade to include BC Java 1.78 or later, BC Java LTS 2.73.6 or later, BC-FJA 1.0.2.5 or later, and BC C# .Net 2.3.1 or later.
In cases where immediate patching is not feasible, organizations should implement configuration hardening measures to limit the risk of exploitation. This includes monitoring for unusual CPU usage patterns that may indicate an attempt to exploit this vulnerability.
Penetration testing can also be employed to validate the effectiveness of implemented fixes.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts, including unusual patterns of CPU utilization that may suggest the importation of crafted EC certificates. Behavioral anomalies in application performance should be investigated promptly to mitigate any potential impact.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2024-29857 lies in its potential to disrupt services relying on Bouncy Castle libraries. As organizations increasingly adopt cryptographic libraries, vulnerabilities that can lead to denial-of-service conditions will become more prevalent.
Security teams should learn from this vulnerability and enhance their threat modeling processes to account for similar issues in cryptographic implementations. Regular updates and monitoring can help prevent exploitation of such vulnerabilities.
Organizations are encouraged to review their security practices and consider adopting measures such as penetration testing methodology to improve their resilience against such vulnerabilities.
Finally, organizations should stay informed about emerging vulnerabilities and trends in the security landscape, especially those affecting widely used libraries.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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