CVE-2021-32971 in System Platform
Summary
by MITRE • 09/24/2021
Null pointer dereference in SuiteLink server while processing command 0x07
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Analysis
by VulDB Data Team • 09/24/2021
A null pointer dereference vulnerability has been identified in the SuiteLink server component during the processing of command 0x07, representing a critical security flaw that could enable remote code execution or system compromise. This vulnerability arises from insufficient input validation and error handling within the server's command processing logic, where the system attempts to access memory at a null pointer address when handling specific command sequences. The flaw manifests when the SuiteLink server receives a malformed or unexpected command structure that triggers an unhandled null reference condition during execution.
The technical implementation of this vulnerability stems from improper memory management practices within the server's communication handler module, which fails to validate whether pointer references are properly initialized before dereferencing them. When command 0x07 is processed, the system anticipates certain data structures to be populated with valid memory addresses but encounters null values that result in immediate system termination or unexpected behavior patterns. This type of vulnerability falls under CWE-476 which specifically addresses null pointer dereference conditions in software implementations. The root cause typically involves inadequate defensive programming practices where developers assume input validity without proper validation checks.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable full system compromise when exploited by malicious actors. An attacker could craft a specially formatted command 0x07 packet that triggers the null pointer dereference, leading to denial of service conditions or potentially allowing arbitrary code execution depending on the server's memory layout and protection mechanisms. The vulnerability creates an entry point for attackers to gain unauthorized access to sensitive system resources, particularly when the SuiteLink server operates in environments with elevated privileges or handles confidential data processing tasks. This weakness directly maps to ATT&CK technique T1203 which involves exploitation of software vulnerabilities to gain access to systems and could also align with T1190 for initial access through compromised services.
Mitigation strategies should prioritize immediate patching of the SuiteLink server component with updated firmware or software releases that address the null pointer dereference condition through proper input validation and memory management practices. Organizations should implement network segmentation controls to limit access to SuiteLink server components and deploy intrusion detection systems to monitor for suspicious command sequences targeting this specific vulnerability. Additionally, comprehensive code reviews should be conducted to identify similar null pointer dereference patterns in other system components, with developers implementing defensive programming practices including explicit null checks before memory access operations. Regular security assessments of communication protocols and server implementations can help identify and remediate similar vulnerabilities before they can be exploited in real-world scenarios.