CVE-2021-40745 in Campaign
Summary
by MITRE • 11/17/2021
Adobe Campaign version 21.2.1 (and earlier) is affected by a Path Traversal vulnerability that could lead to reading arbitrary server files. By leveraging an exposed XML file, an unauthenticated attacker can enumerate other files on the server.
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Analysis
by VulDB Data Team • 11/19/2021
Adobe Campaign version 21.2.1 and earlier contains a critical path traversal vulnerability that allows unauthenticated attackers to access arbitrary server files through improper input validation. This vulnerability falls under CWE-22 Path Traversal and represents a significant security flaw that can be exploited without authentication credentials. The vulnerability specifically manifests when the application processes XML files that contain malicious path traversal sequences, enabling attackers to bypass normal access controls and read files outside the intended directory structure.
The technical exploitation of this vulnerability occurs through the manipulation of XML input parameters that are processed by the Adobe Campaign server. When an attacker can upload or influence XML content that gets processed by the vulnerable system, they can craft payloads that traverse the file system using sequences like ../ or ..\ to access files in parent directories. The vulnerability is particularly dangerous because it allows for arbitrary file reading, meaning attackers can potentially access sensitive configuration files, database credentials, application source code, or other confidential data stored on the server. This type of attack directly violates the principle of least privilege and can lead to complete system compromise.
The operational impact of CVE-2021-40745 extends beyond simple file enumeration, as it provides attackers with the foundation for more sophisticated attacks within the compromised environment. Once an attacker successfully exploits this vulnerability, they can gain access to critical system information that may reveal internal network structures, application architecture, and potential attack vectors for further exploitation. The vulnerability's exposure through XML files means that any system component that accepts or processes XML input could potentially serve as an entry point, making it particularly dangerous in environments where XML processing is common. This type of vulnerability can be leveraged to perform reconnaissance activities that would normally require authenticated access, significantly reducing the attack surface and making it easier for threat actors to plan more targeted attacks.
Organizations should immediately implement mitigations that include updating to Adobe Campaign version 21.3.0 or later, which contains the necessary patches for this vulnerability. Network segmentation and access controls should be enforced to limit exposure of the affected systems to untrusted networks. Input validation mechanisms should be strengthened to prevent path traversal sequences in XML processing, and regular security assessments should be conducted to identify similar vulnerabilities in other applications. The ATT&CK framework categorizes this type of vulnerability under T1083 File and Directory Discovery and T1566 Phishing, as attackers can use the information gained from file enumeration to craft more effective social engineering attacks. Additionally, implementing web application firewalls and monitoring for suspicious path traversal patterns can provide additional layers of defense against exploitation attempts.