CVE-2023-45284: Medium Vulnerability in Golang Go

On November 9, 2023, a medium-severity vulnerability was published affecting the Golang Go package. The vulnerability arises from the IsLocal function, which fails to accurately detect reserved device names under certain conditions on Windows. Specifically, names like "COM1 "—with a trailing space—and reserved names "COM" and "LPT" followed by superscript numbers are incorrectly reported as local devices. The fix ensures that IsLocal correctly identifies these as non-local, addressing a crucial aspect of system integrity.

The CVSS score for this vulnerability is 5.3, categorized as medium severity. This rating indicates a moderate level of risk, primarily due to the potential for local exploitation via network access, low attack complexity, and no user interaction requirement. Organizations using affected versions should evaluate their exposure to these device name parsing issues.

Risk to organizations includes potential unauthorized access or manipulation of system functions due to incorrect device name recognition. This vulnerability could lead to unexpected behaviors in applications relying on accurate device name detection, thereby impacting system integrity and operational stability. Organizations should prioritize patching immediately.

Currently, there is no known public exploit for this vulnerability, and it has not been included in the Known Exploited Vulnerabilities (KEV) catalog. However, given its nature and potential impact, organizations are urged to remain vigilant and apply the latest patches to mitigate risks.

Vulnerability Details

The official description states that on Windows, the IsLocal function does not correctly detect reserved device names in some cases. Reserved names followed by spaces, such as "COM1 ", and reserved names "COM" and "LPT" followed by superscript 1, 2, or 3 are incorrectly reported as local. With the fix, IsLocal now correctly reports these names as non-local.

The vulnerability is classified under CVSS version 3.1 with a base score of 5.3. The attack vector is network-based, with low complexity, requiring no privileges or user interaction. The potential impacts include low integrity and no confidentiality or availability impacts.

Technical Analysis

The root cause of this vulnerability is the IsLocal function's improper handling of reserved device names in certain scenarios. The attack vector is network-based, allowing attackers to exploit this vulnerability remotely. The attack complexity is classified as low, meaning that exploiting the vulnerability does not require sophisticated techniques or significant effort. No privileges are required to exploit this vulnerability, and user interaction is not necessary.

The integrity impact is considered low, as successful exploitation may lead to incorrect handling of device name recognition but does not affect overall system integrity or availability. The confidentiality impact is none, as the vulnerability does not expose sensitive information.

Risk & Impact Analysis

Organizations should assess the real-world deployment risk associated with this vulnerability. The improper detection of reserved device names can lead to unexpected behaviors in applications, potentially enabling unauthorized access or manipulation of sensitive system functions. The blast radius for this vulnerability is moderate, primarily affecting systems running specific versions of the Golang Go package on Windows.

Given the CVSS score of 5.3, organizations should address this vulnerability in their priority patch cycle. It is essential to monitor for updates and apply the necessary fixes to prevent potential exploitation, even if no public exploit is currently known.

Exploitation Status

Affected Versions

The vulnerability affects the Golang Go package versions prior to 1.20.11 and versions from 1.21.0-0 to 1.21.4. Organizations using these versions should take necessary actions to remediate the issue.

Mitigation & Remediation

To mitigate this vulnerability, organizations should upgrade to the latest version of the Golang Go package. If immediate patching is not feasible, consider implementing configuration hardening and network controls to limit exposure to potential exploitation. Monitoring for unusual behaviors related to device name handling is also recommended. For comprehensive security validation, organizations should engage in penetration testing to identify and address similar vulnerabilities.

Detection Guidance

Organizations should monitor logs for any anomalies related to device name parsing, specifically focusing on reserved device names. Behavioral anomalies in applications that interface with device names should also be tracked. Additionally, network signatures associated with unexpected interactions with device names can provide insights into potential exploitation attempts.

AppSecure Threat Intelligence Insight

The long-term significance of CVE-2023-45284 lies in its exposure of critical flaws within the IsLocal function. It represents a pattern of vulnerabilities related to the handling of reserved device names, which can lead to security misconfigurations if not addressed. Organizations should take this incident as a lesson to enhance their security practices around input validation and device management.

Security teams should also focus on strengthening their overall application security posture to prevent similar vulnerabilities. Organizations are encouraged to review their security programs and consider implementing vulnerability management programs that continuously assess and manage risks.

Additionally, organizations should leverage effective penetration testing methodologies to identify and remediate vulnerabilities proactively.

Finally, organizations should consider implementing comprehensive security assessments, including web application penetration testing, to ensure defense mechanisms are robust against evolving threats.