CVE-2023-37475 is a high-severity vulnerability affecting the avro_project's avro library, a Go language encoder/decoder for the Avro codec specification. This vulnerability allows an attacker to craft a string that, when passed to avro's `github.com/hamba/avro/v2.Unmarshal()`, can trigger a fatal error leading to an out-of-memory condition. This situation is unrecoverable and can result in denial of service for applications using the avro library.
The vulnerability has a CVSS score of 7.5, indicating a high severity level. The risk to organizations includes potential downtime and service disruption due to the application's inability to handle the crafted input, making it critical for affected users to address this issue immediately. There are no known workarounds for this vulnerability, emphasizing the urgency for organizations to implement the necessary patches.
The vulnerability was published on July 17, 2023, and has since been modified as further details emerged. Users are strongly advised to upgrade to version 2.13.0 or later, where this issue has been addressed, to mitigate the risk of exploitation. Exploit attempts have not been confirmed in the wild, but the nature of this vulnerability presents a significant threat.
Organizations should prioritize patching immediately to prevent potential service interruptions and ensure the stability of their applications utilizing the avro library.
Vulnerability Details
This vulnerability allows an attacker to exploit a flaw in the way avro handles input during the unmarshalling process. Specifically, the input string can cause the library to allocate excessive memory, leading to a denial of service condition.
The CVSS score is 7.5, classified as high, with the following metrics: attack vector is network, attack complexity is low, and no privileges or user interaction are required for exploitation. The impact is assessed as high for availability.
The affected product is the avro library, and the vulnerability is associated with CWE-400, indicating an arbitrary memory consumption issue.
Technical Analysis
The root cause of this vulnerability lies within the input handling mechanism of the `Unmarshal()` function. By crafting a specific string input, an attacker can manipulate the memory allocation process. Since avro uses part of the input to determine the size of the slice it creates, this can lead to arbitrary memory consumption.
The attack vector is network-based, meaning that an attacker does not need local access to the system to exploit this vulnerability. The complexity of the attack is low, as it does not require any special conditions or privileges. Additionally, no user interaction is needed, making it easier for an attacker to carry out the exploit.
The implications of this vulnerability are significant, with a potential impact on the availability of the system. If exploited, the application using the avro library could crash, affecting any services relying on it.
Risk & Impact Analysis
Real-world deployment risks associated with CVE-2023-37475 include the potential for service disruptions, which can lead to downtime and loss of revenue. Since this vulnerability can be exploited remotely without any special access or interaction, it poses a serious threat to organizations utilizing the affected library in production environments.
In terms of blast radius, the impact can extend beyond individual applications to affect entire services or platforms that utilize the avro library. The urgency for remediation is underscored by the high CVSS score and the lack of workarounds, necessitating immediate action from organizations.
Organizations should address this vulnerability in their priority patch cycle and ensure that all instances of the avro library are updated to at least version 2.13.0 to mitigate the risk of exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of the avro library prior to version 2.13.0. Organizations using affected versions should prioritize updating their systems to the latest release.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to avro version 2.13.0 or later. This version includes a fix for the out-of-memory issue that can lead to denial of service.
If immediate patching is not possible, organizations should implement monitoring to detect anomalous memory usage patterns and consider applying network controls to limit exposure. However, upgrading is the most effective solution.
Organizations may also consider implementing configuration hardening to restrict the types of data that can be processed by the avro library.
For further assistance, organizations can explore our penetration testing services aimed at identifying weaknesses in their systems.
Detection Guidance
Organizations should monitor logs for indicators of abnormal memory usage and application crashes. Behavioral anomalies related to service responsiveness could also indicate exploitation attempts.
Network signatures detecting large incoming payloads that may trigger the vulnerability should be established, and systems should be regularly audited for compliance with best practices.
AppSecure Threat Intelligence Insight
The existence of CVE-2023-37475 highlights the ongoing need for organizations to maintain vigilance in monitoring and updating their software dependencies. As vulnerabilities like this can lead to significant service disruptions, a proactive approach to vulnerability management is essential.
Security teams should adopt a comprehensive vulnerability management program to identify and address similar vulnerabilities proactively.
Furthermore, staying informed about emerging threats and trends in software vulnerabilities will enable organizations to adapt their security strategies accordingly. For insights on effective practices, refer to our penetration testing methodology guide.
Lastly, organizations should consider conducting regular security assessments to continuously evaluate their defenses. Our application security assessment services can help identify and mitigate vulnerabilities before they can be exploited.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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