CVE-2023-27534 is a high-severity path traversal vulnerability affecting curl versions prior to 8.0.0. This vulnerability allows attackers to exploit the SFTP implementation by utilizing the tilde (~) character incorrectly as a prefix in the first path element. As a result, attackers can bypass filtering mechanisms or execute arbitrary code by crafting specific paths, such as /~2/foo, while accessing a server under particular user contexts.
With a CVSS score of 8.8, this vulnerability signifies a high-risk factor due to its potential for exploitation through network access, requiring only low privileges and no user interaction. The implications of this vulnerability are severe, as it can lead to significant confidentiality, integrity, and availability impacts.
Organizations should prioritize patching immediately to prevent unauthorized access or data breaches. It is crucial for security teams to assess their environments for affected versions of curl and implement necessary updates to safeguard against potential attacks.
Exploitation status for this vulnerability is currently assessed as no known exploits or public proofs of concept available, but the ease of exploitation indicates that attackers may quickly develop such methods.
Organizations must remain vigilant in monitoring for this vulnerability and ensure that they are on the latest version to mitigate any potential risks associated with this flaw.
Vulnerability Details
The vulnerability presents itself in the SFTP implementation of curl versions below 8.0.0. Attackers can exploit the flaw by constructing paths that leverage the incorrect handling of the tilde (~) character. This misconfiguration allows for bypassing security filters that are meant to prevent unauthorized access.
The vulnerability is classified under CWE-22, which pertains to improper limitation of a pathname to a restricted directory (path traversal). The vulnerability was published on March 30, 2023, and has since been marked as modified.
Technical Analysis
The root cause of this vulnerability lies in the incorrect handling of the tilde (~) character in the SFTP implementation of curl. The attack vector is network-based, and the complexity of the attack is low, making it accessible for attackers with minimal skills.
Attackers require low privileges to carry out the exploit, and no user interaction is necessary. The vulnerability has high impacts on confidentiality, integrity, and availability, as successful exploitation can lead to unauthorized access to sensitive files and potential remote code execution.
Risk & Impact Analysis
Risk to organizations includes unauthorized access to sensitive data, potential data breaches, and significant operational disruptions. The ease of exploitation underscores the urgency for organizations to address this vulnerability.
Organizations should address this vulnerability in their priority patch cycle, given the high CVSS score and the potential for significant impact on their systems.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include curl versions from 7.18.0 to 7.88.1. Additionally, various firmware versions for NetApp and Broadcom products are also impacted. Organizations should ensure they are aware of the specific versions in use and apply necessary updates.
Mitigation & Remediation
Organizations should prioritize upgrading to curl version 8.0.0 or later to mitigate the risk associated with this vulnerability. If an immediate upgrade is not feasible, temporary workarounds include restricting access to SFTP functionalities or implementing additional input validation to prevent path traversal attacks.
Monitoring for unusual access patterns and logging any anomalies related to file access can also help in identifying potential exploitation attempts.
For comprehensive security assessments, organizations can utilize penetration testing services to validate their security posture.
Detection Guidance
Monitoring logs for unauthorized file access attempts and unusual patterns in SFTP traffic is critical. Security teams should look for any indicators of exploitation, including attempts to access paths containing the tilde (~) character.
Behavioral anomalies related to user access and system changes should also be logged and analyzed to detect potential misuse.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-27534 lies in its representation of common security flaws in widely used libraries such as curl. This vulnerability highlights the necessity for continuous monitoring and timely patching of software dependencies.
Security teams should take this incident as a lesson to prioritize vulnerability management and ensure that their systems remain up-to-date with the latest security patches.
For further insights into managing vulnerabilities, security teams can refer to the vulnerability management program design and the importance of penetration testing methodology in identifying and remediating such vulnerabilities.
Organizations should also consider utilizing API security testing as part of their overall security strategy.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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