CVE-2020-1925 in Olingo
Summary
by MITRE
Apache Olingo versions 4.0.0 to 4.7.0 provide the AsyncRequestWrapperImpl class which reads a URL from the Location header, and then sends a GET or DELETE request to this URL. It may allow to implement a SSRF attack. If an attacker tricks a client to connect to a malicious server, the server can make the client call any URL including internal resources which are not directly accessible by the attacker.
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Analysis
by VulDB Data Team • 01/10/2020
The vulnerability identified as CVE-2020-1925 affects Apache Olingo versions ranging from 4.0.0 through 4.7.0 and stems from the implementation of the AsyncRequestWrapperImpl class. This component within the Olingo library demonstrates a critical security flaw by automatically extracting URLs from the Location header of HTTP responses and subsequently initiating GET or DELETE requests to these locations. The design flaw creates an inherent trust model that allows the library to blindly follow redirects without proper validation or sanitization of the target URLs. This behavior fundamentally exposes applications using Olingo to server-side request forgery attacks where malicious actors can manipulate the redirect chain to access internal resources that would normally be protected from external access.
The technical exploitation of this vulnerability occurs through manipulation of HTTP responses that contain Location headers pointing to malicious endpoints. When the AsyncRequestWrapperImpl processes these responses, it automatically follows the redirect without implementing any security controls to verify the destination URL's legitimacy or restrict access to internal network resources. The flaw aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities, and represents a classic example of how insecure redirect handling can bypass network segmentation and access controls. Attackers can craft malicious responses that redirect to internal services such as internal APIs, database endpoints, or administrative interfaces that are normally protected by firewalls or network access controls.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to potentially access sensitive internal resources that may contain confidential data, administrative functions, or system configuration details. Applications using affected versions of Olingo become vulnerable to attacks where the client application acts as an unwitting proxy, making requests to internal systems that the attacker cannot directly reach. This creates a significant risk for organizations where the Olingo library is used in enterprise applications, web services, or API gateways that process user-supplied data or interact with external services. The vulnerability particularly affects systems where the client application has elevated privileges or access to internal network resources, amplifying the potential damage from such attacks.
Organizations should immediately upgrade to Apache Olingo versions 4.8.0 or later where this vulnerability has been addressed through proper URL validation and restriction of redirect behavior. The fix typically involves implementing strict validation of URLs extracted from Location headers, including checks for internal IP ranges, loopback addresses, and other restricted network destinations. Security teams should also consider implementing network segmentation controls, firewall rules, and proxy configurations that prevent outbound requests to internal network segments from applications that may be vulnerable. Additionally, monitoring for unusual redirect patterns and implementing proper input validation for HTTP headers can help detect and prevent exploitation attempts. The vulnerability demonstrates the importance of secure coding practices around URL handling and redirect processing, as outlined in the OWASP Top Ten and MITRE ATT&CK framework's server-side request forgery techniques, which emphasize the need for robust validation and access control mechanisms in web applications.