CVE-2023-24534: High Vulnerability in Golang Go

CVE-2023-24534 is a high-severity vulnerability affecting the Golang programming language, specifically in its HTTP and MIME header parsing. This vulnerability allows attackers to exploit certain unusual patterns of input data, leading to excessive memory allocation by the server. The primary risk associated with this vulnerability is the potential for denial of service (DoS) due to memory exhaustion. As such, organizations utilizing affected versions of Golang must prioritize remediation.

The CVSS score for this vulnerability is 7.5, classifying it as high severity. This score indicates a significant risk as it can be exploited over the network, requires no privileges or user interaction, and has a high impact on availability. Organizations must understand the implications of this vulnerability, particularly in environments where Golang is used for web services.

Currently, there is no public knowledge of exploits related to this vulnerability, and it is not included in the KEV catalog. However, the nature of the vulnerability suggests that it could be targeted by attackers looking to disrupt services. Therefore, organizations should address this issue in their priority patch cycle.

Organizations should prioritize patching immediately. The resolution of this vulnerability lies in updating to the patched versions of Golang that correctly allocate memory required to hold parsed headers, thus preventing the risk of denial of service.

Vulnerability Details

This vulnerability allows HTTP and MIME header parsing to allocate large amounts of memory even with small inputs, potentially leading to a denial of service. Attackers can exploit this behavior to cause an HTTP server to allocate excessive memory from minimal requests, resulting in memory exhaustion. The vulnerability is classified under CWE-400, indicating the issue of uncontrolled resource consumption.

The CVSS score for CVE-2023-24534 is 7.5, categorized as high severity. This reflects a significant risk, with an attack vector of network and low attack complexity. Importantly, no privileges or user interaction is required, making exploitation easier for potential attackers.

The affected product is Golang, specifically the 'go' component. The vulnerability was published on April 6, 2023, and has been classified as modified since its initial disclosure.

Technical Analysis

The root cause of this vulnerability stems from how the Golang HTTP and MIME header parsing functions manage memory allocation. Certain unusual input patterns can trigger the allocation of significantly more memory than necessary, leading to potential exhaustion of server resources.

The attack vector for this vulnerability is network-based, meaning that an attacker can exploit it remotely. The attack complexity is low, as no special conditions or privileges are required for exploitation. Additionally, no user interaction is necessary, making it even more critical to address.

The impact on availability is high, as successful exploitation can lead to service disruptions. However, the vulnerability does not impact confidentiality or integrity, making its effects primarily focused on denial of service.

Risk & Impact Analysis

The real-world deployment risk associated with CVE-2023-24534 is significant. Organizations utilizing Golang for web services may face disruptions if an attacker exploits this vulnerability. The potential for denial of service means that businesses could experience downtime, leading to lost revenue and damage to reputation.

This vulnerability represents a critical threat to organizations that rely on Golang-based applications. The urgency for remediation is underscored by the high CVSS score and the nature of the vulnerability, which can be exploited remotely without any privileges.

Given the impact on availability, organizations should assess their exposure to this vulnerability and prioritize patching accordingly. The urgency for organizations to address this vulnerability is high, as timely remediation can prevent potential service disruptions.

Exploitation Status

Affected Versions

The affected versions of Golang include all versions prior to 1.19.8 and versions from 1.20.0 to 1.20.3. Organizations are advised to upgrade to the latest patched version to mitigate this vulnerability.

Mitigation & Remediation

Organizations should immediately update their Golang installations to version 1.19.8 or later. If an immediate update is not feasible, consider implementing network controls to limit exposure to untrusted inputs that could exploit this vulnerability. Additionally, monitoring for unusual memory usage patterns in applications utilizing Golang can help detect potential exploitation attempts.

For further guidance on best practices for securing Golang applications, organizations can refer to our application security assessment services.

Detection Guidance

To monitor for potential exploitation of this vulnerability, organizations should implement logging that tracks memory usage patterns in applications using Golang. Additionally, monitoring for anomalous HTTP request patterns can help identify attempts to exploit this vulnerability.

AppSecure Threat Intelligence Insight

The long-term significance of CVE-2023-24534 lies in its demonstration of how seemingly minor parsing functions can lead to substantial vulnerabilities when improperly managed. This case highlights the need for rigorous testing of input data handling in development.

Organizations are encouraged to adopt a proactive security posture by regularly conducting security assessments and revisiting their coding practices to mitigate similar risks in the future. For more insights on vulnerability management, review our vulnerability management program design guidelines.

Additionally, organizations should consider integrating continuous security testing into their development lifecycle to catch similar vulnerabilities early. Our continuous penetration testing services can help ensure ongoing security.