Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions. In versions 6.06 through 6.16, the random_string function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes by concatenating a SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. The built-in rand function is unsuitable for cryptographic usage.
Before version 6.06, there was no fallback when /dev/urandom was not available. Before version 6.04, the random_string function used the built-in rand() function to generate a mixed-case alphanumeric string. This function may be used for generating session ids, generating secrets for signing or encrypting cookie session data and generating tokens used for Cross Site Request Forgery (CSRF) protection.
With a CVSS score of 9.8, this vulnerability is classified as critical, and the risk to organizations includes potential unauthorized access to sensitive data due to the inadequate randomness in security tokens.
Organizations should prioritize patching immediately to mitigate this vulnerability. Patching to version 6.17 or later is essential to ensure that the random_string implementation is secure.
No public exploit has been confirmed, but the nature of the vulnerability and its critical severity warrant immediate attention.
Vulnerability Details
The vulnerability affects all versions of Amon2 prior to 6.17. It is classified under CWE-338 (Use of Cryptographically Weak Pseudo-Random Number Generator) and CWE-340 (Prediction of Cryptographic Key).
The attack vector is NETWORK, with low attack complexity and no privileges required for exploitation, making it accessible to a wide range of attackers. This poses a high risk to confidentiality, integrity, and availability.
Technical Analysis
The root cause of this vulnerability stems from the insecure implementation of the random_string function in Amon2, which relies on the built-in rand() function when /dev/urandom is unavailable. This method offers insufficient randomness, making it susceptible to prediction and exploitation.
The attack vector primarily involves network access, allowing attackers to exploit this vulnerability remotely. The complexity of the attack is low, requiring no special privileges or user interaction, further increasing the potential risk.
Given the high confidentiality, integrity, and availability impact scores, organizations utilizing Amon2 must recognize the potential for significant damage if this vulnerability is exploited.
Risk & Impact Analysis
Risk to organizations includes unauthorized access to sensitive data and potential data breaches. The vulnerability's low attack complexity means that various actors, including malicious insiders and external attackers, could exploit it without significant barriers.
Organizations should assess their use of Amon2 and prioritize remediation efforts. Given the critical CVSS score, immediate action should be taken to patch systems and protect against this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to 6.17 are affected. Organizations must ensure they upgrade to this version or later to mitigate the vulnerability.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade their Amon2 installations to version 6.17 or later. If a patch is unavailable, consider implementing stricter security measures around session management and token generation.
For ongoing security assessments, organizations should engage in penetration testing to identify similar weaknesses.
Detection Guidance
Monitor logs for any anomalies related to session management and token generation. Watch for failed attempts to access resources that require secure tokens, which may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability is underscored by the critical nature of secure random number generation in security functions. Organizations should take this incident as a learning opportunity to enhance their security protocols.
Security teams should evaluate their reliance on weak random number generators and consider stronger alternatives. Regular reviews of security implementations can prevent similar vulnerabilities.
In light of this vulnerability, organizations are encouraged to implement vulnerability management programs to proactively address potential weaknesses in their systems.
Additionally, organizations should explore penetration testing methodologies that emphasize the importance of secure coding practices.
Finally, reviewing the latest trends in application security can help organizations stay ahead of potential threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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