CVE-2013-6821 in NetWeaver
Summary
by MITRE
Directory traversal vulnerability in the Exportability Check Service in SAP NetWeaver allows remote attackers to read arbitrary files via unspecified vectors.
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Analysis
by VulDB Data Team • 03/16/2019
The vulnerability identified as CVE-2013-6821 represents a critical directory traversal flaw within SAP NetWeaver's Exportability Check Service component. This security weakness resides in the application's handling of file access requests and permits unauthorized remote exploitation through unspecified attack vectors that manipulate file path resolution mechanisms. The flaw specifically affects SAP NetWeaver systems where the Exportability Check Service is deployed, potentially enabling attackers to bypass normal access controls and retrieve sensitive files from the underlying operating system. Such vulnerabilities typically arise from insufficient input validation and inadequate sanitization of user-supplied data that influences file system operations. The impact extends beyond simple information disclosure as it can potentially lead to complete system compromise through access to configuration files, database credentials, or other sensitive system artifacts.
The technical implementation of this directory traversal vulnerability stems from improper validation of file path parameters within the Exportability Check Service. Attackers can exploit this weakness by crafting malicious requests that include directory traversal sequences such as "../" or similar path manipulation techniques. These sequences allow the service to navigate outside its intended directory boundaries and access files that should normally remain protected. The vulnerability operates at the application layer and requires no authentication for exploitation, making it particularly dangerous in environments where SAP NetWeaver is accessible from untrusted networks. This flaw aligns with CWE-22, which classifies directory traversal vulnerabilities as improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
From an operational perspective, the exploitation of CVE-2013-6821 can result in significant data breaches and system compromise across affected SAP NetWeaver installations. Organizations utilizing this service may experience unauthorized access to confidential business data, system configuration files, and potentially sensitive credentials stored within the application environment. The remote nature of the attack means that threat actors can exploit this vulnerability from anywhere on the internet without requiring physical access to the target network. This characteristic makes the vulnerability particularly attractive to automated attack campaigns and increases the potential attack surface significantly. The impact assessment must consider not only the immediate data exposure but also the potential for further lateral movement within the network infrastructure and the possibility of establishing persistent access points for future exploitation attempts.
Mitigation strategies for CVE-2013-6821 should prioritize immediate patch application from SAP as the primary defense mechanism against this vulnerability. Organizations must also implement network segmentation controls to limit access to SAP NetWeaver services and restrict external exposure of the Exportability Check Service. Additional protective measures include implementing web application firewalls to filter suspicious path traversal attempts, conducting regular security assessments of SAP environments, and establishing robust monitoring procedures to detect anomalous file access patterns. The remediation process should involve comprehensive vulnerability scanning across all SAP NetWeaver installations, followed by immediate patch deployment and configuration hardening. Security teams must also consider implementing principle of least privilege controls and regular access reviews to minimize the potential impact of successful exploitation attempts. These defensive measures align with ATT&CK framework techniques related to credential access and privilege escalation, emphasizing the importance of layered security approaches to protect against such directory traversal vulnerabilities.