CVE-2021-22549 in Asylo
Summary
by MITRE • 06/08/2021
An attacker can modify the address to point to trusted memory to overwrite arbitrary trusted memory. It is recommended to update past 0.6.2 or git commit https://github.com/google/asylo/commit/53ed5d8fd8118ced1466e509606dd2f473707a5c
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Analysis
by VulDB Data Team • 06/11/2021
The vulnerability identified as CVE-2021-22549 resides within the Asylo framework, a trusted execution environment library developed by google for building confidential computing applications. This issue represents a critical memory corruption flaw that allows adversaries to manipulate memory addresses and overwrite trusted memory regions. The vulnerability specifically affects versions prior to 0.6.2 of the Asylo SDK, making it a significant concern for organizations relying on this framework for secure application development and execution.
The technical nature of this vulnerability stems from improper memory address validation within the framework's memory management mechanisms. An attacker who successfully exploits this flaw can manipulate pointers to redirect memory operations toward trusted memory regions, effectively enabling arbitrary code execution within the trusted environment. This type of vulnerability falls under the category of memory safety issues and aligns with CWE-787: "Out-of-bounds Write" and CWE-121: "Stack-based Buffer Overflow" classifications. The flaw operates by allowing untrusted code to influence memory addressing logic, potentially bypassing security boundaries that should protect sensitive data and execution contexts.
The operational impact of CVE-2021-22549 extends beyond simple memory corruption, as it fundamentally undermines the security model of trusted execution environments. When exploited, this vulnerability can compromise the confidentiality and integrity of data processed within the Asylo framework, potentially allowing attackers to access sensitive information, modify trusted code, or escalate privileges within the secure execution context. Organizations utilizing confidential computing workloads built on Asylo may face severe consequences including data breaches, compliance violations, and loss of trust in their security infrastructure. The vulnerability particularly affects systems implementing Intel SGX enclaves and similar trusted execution technologies where memory isolation is critical for maintaining security boundaries.
Mitigation strategies for this vulnerability require immediate action to update the Asylo framework to version 0.6.2 or later, or to apply the specific patch referenced in the git commit hash 53ed5d8fd8118ced1466e509606dd2f473707a5c. System administrators should also conduct thorough security assessments of all applications built using the affected framework versions to identify potential exploitation vectors. Organizations should implement monitoring for anomalous memory access patterns and consider additional defensive measures such as runtime integrity checking and memory access controls. The fix addresses the core memory addressing logic that allowed attackers to manipulate trusted memory regions, thereby restoring proper security boundaries within the trusted execution environment. This vulnerability demonstrates the critical importance of maintaining up-to-date security libraries in confidential computing environments where even minor flaws can compromise entire security architectures.