CVE-2021-37136 is a high-severity vulnerability affecting various products, including Netty, Quarkus, Oracle, and Debian. This vulnerability allows attackers to exploit the Bzip2 decompression decoder function, which fails to set size restrictions on decompressed output data. The lack of these restrictions can lead to excessive memory allocation, potentially triggering an Out of Memory Error (OOME) and resulting in a Denial of Service (DoS) attack.
The CVSS score for this vulnerability is 7.5, indicating high severity. Organizations utilizing the affected components should take this threat seriously, as the attack vector is over the network, and the complexity is low, requiring no privileges or user interaction. Given these factors, the risk to organizations includes potential service outages and disruptions.
Given the high impact on availability and the ease of exploitation, organizations should prioritize patching immediately. The vulnerability’s exploitation status is currently unconfirmed, but the potential for malicious use underscores the need for swift action.
The urgency for defenders cannot be overstated. Organizations using any affected component should assess their systems and apply the necessary patches to mitigate the risks associated with this vulnerability.
Vulnerability Details
The official description of the vulnerability states that the Bzip2 decompression decoder function does not allow setting size restrictions on the decompressed output data, which affects the allocation size used during decompression. All users of Bzip2Decoder are affected, and the malicious input can trigger an Out of Memory Error (OOME), leading to a DoS attack.
The vulnerability is classified under CWE-400, indicating an allocation of resources without limits or throttling. This can lead to service degradation or outages, making it critical for organizations to address this issue promptly.
The CVSS score for CVE-2021-37136 is 7.5, categorized as high severity. This score reflects the significant impact on availability, with the potential for complete service disruption.
Affected products include various versions of Netty, Quarkus, and Oracle's banking APIs. The vulnerability was published on October 19, 2021, and has since been modified. Organizations using these products should verify their versions against the affected configurations and ensure they are running the latest patches.
Technical Analysis
The root cause of CVE-2021-37136 lies in the design of the Bzip2 decompression decoder, which lacks proper size restrictions on decompressed output data. This flaw allows attackers to craft malicious inputs that can exploit the decompression function, leading to high memory consumption. The attack vector is over the network, meaning that an attacker does not need physical or local access to exploit the vulnerability.
The attack complexity is low, requiring no privileges or user interaction, which further enhances the risk. Given that the confidentiality and integrity impacts are rated as none, the primary concern is the availability impact, which is rated as high. Organizations must be vigilant as this vulnerability can lead to significant service disruptions.
Risk & Impact Analysis
Real-world deployment of this vulnerability poses a substantial risk to organizations, especially those that rely on the affected components for critical services. The potential for a successful denial of service attack could lead to significant financial losses and damage to reputation, especially for organizations in sectors such as finance and digital services.
Organizations should assess their exposure to this vulnerability, considering the attack vector and low complexity. The urgency is further underscored by the exploitability assessment, indicating a high likelihood of successful exploitation should an attack be launched.
Given the CVSS score of 7.5 and the fact that it is not part of the KEV catalog, organizations should still treat it with high priority. The EPSS score of 0.01187 places it in the 78th percentile, indicating a notable risk, and underscores the need for prompt remediation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include various components from Netty, Quarkus, and Oracle, specifically those versions prior to the patch release. All versions of Netty prior to 4.1.68 and Quarkus prior to 2.2.4 are vulnerable. Additionally, Oracle's banking APIs and other products within their ecosystem are also affected. Organizations should ensure they are using patched versions to mitigate this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching affected systems immediately. Recommended actions include upgrading to the latest versions of Netty, Quarkus, and Oracle products that address CVE-2021-37136. For those unable to apply immediate patches, implementing network controls to limit exposure can help mitigate risk.
Further, organizations should consider conducting a comprehensive security assessment to identify other potential vulnerabilities and ensure that configuration hardening is applied where necessary. Continuous monitoring of system logs can also help detect any unusual behavior indicative of exploitation attempts.
Penetration testing can further validate remediation efforts and identify similar weaknesses.
Detection Guidance
To detect potential exploitation attempts of CVE-2021-37136, organizations should monitor for unusual memory consumption patterns and spikes in resource usage. Additionally, logging relevant system events and analyzing behavioral anomalies may provide insights into potential attempts to exploit the vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-37136 lies in its demonstration of the risks associated with inadequate resource management in software components. Organizations should take this vulnerability as a lesson to implement robust resource allocation practices and not to overlook even minor components in their software supply chain.
As vulnerabilities of this nature can lead to severe availability impacts, security teams should prioritize ongoing education about secure coding practices. Continuous assessments of deployed software through continuous security testing can help identify such vulnerabilities before they are exploited.
In summary, CVE-2021-37136 underscores the importance of vigilant monitoring and prompt remediation in maintaining the security and availability of critical systems.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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