CVE-2020-36193 is a high-severity vulnerability affecting PEAR's Archive_Tar, specifically in the Tar.php component. This vulnerability allows write operations with directory traversal due to inadequate checking of symbolic links. The CVSS score for this vulnerability is 7.5, classified as high severity, indicating a significant risk to organizations utilizing affected versions. Since its publication, it remains unaddressed in various deployments, necessitating immediate action from security teams.
The risk to organizations includes unauthorized write access to file systems, potentially leading to data corruption or further exploitation. Given the nature of the vulnerability, attackers may leverage this to execute malicious scripts or manipulate data, thereby compromising system integrity. Given its classification in the Known Exploited Vulnerabilities (KEV) catalog, this vulnerability is actively exploited in the wild, which heightens the urgency for organizations to apply necessary patches.
Organizations should prioritize patching immediately to mitigate potential risks. The vulnerability affects multiple platforms, including Debian and Fedora, and its impact can extend to applications dependent on the Archive_Tar library, such as Drupal. Security teams must evaluate their environments to ensure that all instances of affected versions are updated.
With the recent rise in ransomware attacks exploiting vulnerabilities like this, it is imperative for organizations to conduct regular security assessments and ensure compliance with best practices in vulnerability management.
Vulnerability Details
The vulnerability, classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and CWE-59 (Improper Link Resolution), is specifically found in the Tar.php file within the Archive_Tar package, versions prior to 1.4.11. The official CVE description states: Tar.php in Archive_Tar through 1.4.11 allows write operations with Directory Traversal due to inadequate checking of symbolic links.
The CVSS score of 7.5 demonstrates the high severity of this vulnerability, primarily due to its network attack vector and low attack complexity, which means that an attacker can exploit it without needing significant resources or privileges. The vulnerability was published on January 18, 2021, and has been analyzed extensively.
Technical Analysis
The root cause of this vulnerability lies in the inadequate verification of symbolic links within the Tar.php file. As a result, attackers can exploit this weak validation to perform directory traversal, leading to unauthorized write operations. The attack vector is network-based, allowing remote attackers to execute this vulnerability without needing local access to the affected system.
The attack complexity is classified as low, meaning that an attacker can exploit this vulnerability without needing advanced skills or significant resources. Additionally, no user interaction is required to perform the attack, which increases the likelihood of successful exploitation. The integrity impact is rated high, as attackers can modify or corrupt files on the system without detection.
Risk & Impact Analysis
The real-world risk posed by CVE-2020-36193 is substantial, particularly for organizations utilizing applications that rely on the Archive_Tar library. The potential for unauthorized write access can lead to critical data manipulation, resulting in compromised application integrity and increased operational risks. The blast radius for this vulnerability is expansive, affecting not only the host application but also any systems or services that interact with it.
Organizations should assess their exposure to this vulnerability based on their use of affected systems and prioritize remediation efforts accordingly. The urgency of addressing this vulnerability is critical, especially given its inclusion in the KEV catalog, which indicates active exploitation in the wild.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability impacts the following versions of the Archive_Tar library and associated distributions:
Affected versions include Archive_Tar through 1.4.11, Fedora versions 32 to 35, and Debian Linux versions 9.0 and 10.0. Additionally, various versions of Drupal are also affected, specifically those not patched against this vulnerability.
Mitigation & Remediation
To mitigate the risks associated with CVE-2020-36193, organizations must apply updates provided by the vendor. The specific version to upgrade to will vary based on the affected product. For example, updating to the latest version of Archive_Tar will resolve this vulnerability.
In case a patch is not immediately available, organizations should consider implementing additional security measures, such as restricting file uploads, validating user input, and conducting regular security assessments. Configuration hardening and network controls should also be applied to limit exposure.
Organizations should validate remediation effectiveness through penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor logs for indicators of exploitation, such as unusual file write operations or unauthorized access attempts. Behavioral anomalies in applications that utilize the Archive_Tar library should also be scrutinized. Implementing network signatures to detect potential exploitation attempts can further enhance security.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2020-36193 highlights the importance of robust input validation and secure coding practices in software development. This vulnerability is representative of a broader trend where inadequate validation mechanisms can lead to critical security flaws.
Security teams should draw lessons from this incident to implement stronger security controls and ensure that similar vulnerabilities are identified early in the development lifecycle. For further insights, organizations are encouraged to explore resources such as penetration testing methodology and consider the implications of using third-party libraries without thorough assessments.
To bolster defenses against such vulnerabilities, organizations should also consult best practices outlined in the vulnerability management program and develop comprehensive security strategies that include regular code reviews and security assessments.
Overall, CVE-2020-36193 serves as a critical reminder of the need for continuous vigilance and proactive security measures in an ever-evolving threat landscape.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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