CVE-2022-42745 in CandidATS
Summary
by MITRE • 11/04/2022
CandidATS version 3.0.0 allows an external attacker to read arbitrary files from the server. This is possible because the application is vulnerable to XXE.
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Analysis
by VulDB Data Team • 12/04/2022
The vulnerability identified as CVE-2022-42745 affects CandidATS version 3.0.0 and represents a critical security flaw that enables remote attackers to access arbitrary files on the affected server. This issue stems from the application's improper handling of external XML entities, creating an exploitation vector that can be leveraged by unauthorized actors to gain unauthorized access to sensitive data and system resources. The vulnerability manifests through the application's failure to adequately sanitize XML input, allowing malicious XML documents to be processed without proper validation mechanisms.
The technical root cause of this vulnerability aligns with CWE-611, which describes improper restriction of XML external entity reference. The application's XML parser processes external entities without sufficient controls, enabling attackers to construct malicious XML payloads that can traverse the file system and retrieve files from the server. This type of vulnerability falls under the category of XML External Entity processing flaws, where the application's XML processor is configured to resolve external references without proper restrictions. The attack typically involves crafting an XML document that references external entities pointing to local files on the server, which the parser then resolves and processes, ultimately exposing the contents of those files to the attacker.
From an operational impact perspective, this vulnerability poses significant risks to organizations using CandidATS version 3.0.0 as it can lead to unauthorized data access, potential information disclosure, and in severe cases, system compromise. Attackers can potentially access configuration files, database credentials, application source code, and other sensitive information stored on the server. The vulnerability's remote nature means that attackers do not require physical access or prior authentication to exploit the flaw, making it particularly dangerous in environments where the application is accessible from untrusted networks. The impact extends beyond simple file reading as the exposure of sensitive configuration data could enable further attacks or facilitate lateral movement within the network infrastructure.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, specifically mapping it to techniques involving data extraction and credential access. The vulnerability can be exploited as part of a broader attack chain where initial reconnaissance leads to exploitation of this XXE flaw, followed by information gathering and potentially privilege escalation. Organizations should implement immediate mitigations including updating to a patched version of CandidATS, configuring the XML parser to disable external entity resolution, and implementing proper input validation controls. Network segmentation and firewall rules should be reviewed to limit access to the affected application, while monitoring systems should be enhanced to detect suspicious XML processing activities. Additionally, regular security assessments should be conducted to identify similar vulnerabilities in other applications and ensure comprehensive protection against XML injection attacks.