CVE-2017-8852 in SAPCAR
Summary
by MITRE
SAP SAPCAR 721.510 has a Heap Based Buffer Overflow Vulnerability. It could be exploited with a crafted CAR archive file received from an untrusted remote source. The problem is that the length of data written is an arbitrary number found within the file. The vendor response is SAP Security Note 2441560.
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Analysis
by VulDB Data Team • 12/23/2024
SAPCAR 721.510 represents a critical heap-based buffer overflow vulnerability that exists within SAP's archive extraction utility. This vulnerability stems from improper input validation when processing CAR archive files, which are commonly used for software distribution within SAP environments. The flaw manifests when the application encounters a crafted archive file containing maliciously constructed data lengths that exceed the allocated buffer boundaries. The vulnerability is particularly dangerous because it can be exploited through remote delivery mechanisms, allowing attackers to manipulate the extraction process without requiring local system access. The root cause lies in the application's failure to properly validate or constrain the length values extracted from the archive metadata, enabling arbitrary data writes beyond intended memory boundaries.
The technical exploitation of this vulnerability occurs when SAPCAR processes a specially crafted CAR file that contains malformed length fields within its internal structure. These length fields control how much data is read from the archive and written to memory buffers. When the application reads these arbitrary length values without proper bounds checking, it can overwrite adjacent memory locations, potentially leading to memory corruption that allows for code execution. The vulnerability is classified under CWE-121 Heap-based Buffer Overflow, which specifically addresses buffer overflows occurring in heap memory regions. This type of vulnerability is particularly concerning in enterprise environments where SAP systems process untrusted data from external sources, as it provides a direct pathway for remote code execution attacks.
The operational impact of CVE-2017-8852 extends beyond simple memory corruption, as successful exploitation can enable attackers to gain full control over affected systems. In enterprise SAP environments, this vulnerability represents a significant risk since SAPCAR is frequently used to extract software patches, updates, and other distribution packages from untrusted sources. The attack surface is broadened by the fact that these archive files may be received through automated update mechanisms, email attachments, or web downloads, making the exploitation vector both widespread and difficult to prevent. Organizations running SAP systems that utilize SAPCAR for software management are particularly vulnerable, as the exploitation can lead to complete system compromise and potential data breaches. The vulnerability also impacts the integrity of the SAP ecosystem, as successful exploitation could allow attackers to install backdoors, modify system configurations, or exfiltrate sensitive enterprise data.
Mitigation strategies for this vulnerability require immediate implementation of SAP Security Note 2441560, which provides specific patching guidance for affected systems. Organizations should prioritize updating all SAPCAR installations to versions that properly validate input data lengths and implement robust buffer boundary checks. Network segmentation and access controls should be implemented to limit exposure of systems that process untrusted archive files, while monitoring systems should be deployed to detect suspicious file processing activities. Regular vulnerability assessments and penetration testing should include verification of SAPCAR installations to ensure proper patch application. Additionally, organizations should implement secure coding practices for any custom SAP applications that may interact with archive file processing, following the principles outlined in the OWASP Secure Coding Practices and adhering to the ATT&CK framework's T1203 - Exploitation for Client Execution tactics. The vulnerability demonstrates the critical importance of input validation and memory safety practices in enterprise software systems, particularly those handling external data processing functions.