CVE-2022-22950 in Enterprise Manager for Database
Summary
by MITRE • 04/02/2022
n Spring Framework versions 5.3.0 - 5.3.16 and older unsupported versions, it is possible for a user to provide a specially crafted SpEL expression that may cause a denial of service condition.
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Analysis
by VulDB Data Team • 08/11/2023
The vulnerability identified as CVE-2022-22950 represents a critical denial of service flaw within the Spring Framework ecosystem, affecting versions ranging from 5.3.0 through 5.3.16 along with unsupported older releases. This vulnerability specifically targets the Spring Expression Language (SpEL) processing capabilities that form a fundamental component of the Spring Framework's functionality. The flaw enables malicious actors to craft specially constructed SpEL expressions that can trigger resource exhaustion or system instability, potentially leading to complete service unavailability for legitimate users. The Spring Framework's widespread adoption across enterprise applications makes this vulnerability particularly dangerous as it can affect numerous production systems simultaneously.
The technical root cause of this vulnerability stems from insufficient input validation and sanitization within the SpEL expression parser. When the Spring Framework processes user-supplied SpEL expressions, it fails to adequately constrain the complexity and resource consumption of these expressions during evaluation. This allows attackers to construct expressions that trigger exponential execution paths or infinite loops within the expression engine, consuming CPU cycles and memory resources at an unsustainable rate. The vulnerability operates at the level of expression evaluation where legitimate applications might process user input through SpEL for dynamic feature configuration, data binding, or conditional logic execution. The flaw manifests when the expression engine attempts to parse and evaluate maliciously crafted expressions that contain recursive structures or overly complex nested operations that can cause the JVM to become unresponsive or crash entirely.
The operational impact of CVE-2022-22950 extends beyond simple service disruption to encompass potential system compromise and business continuity issues. Organizations running affected Spring Framework versions face significant risk of denial of service attacks that can render their applications completely inaccessible to legitimate users, potentially resulting in substantial financial losses and reputational damage. The vulnerability's exploitation can occur through various attack vectors including web forms, API endpoints, or any application interface that accepts user input processed through SpEL expressions. Given that the Spring Framework powers countless enterprise applications, the potential attack surface is enormous, making this vulnerability a prime target for automated exploitation campaigns. The vulnerability aligns with CWE-400, which categorizes it as an Uncontrolled Resource Consumption vulnerability, and maps to ATT&CK technique T1499.004 for Network Denial of Service, highlighting its potential for widespread disruption across networked systems.
Mitigation strategies for CVE-2022-22950 primarily focus on immediate version upgrades to Spring Framework 5.3.17 or later, which contain patches addressing the expression evaluation constraints. Organizations should implement comprehensive input validation and sanitization measures for any user-supplied content that might eventually be processed through SpEL expressions, including implementing maximum expression length limits and complexity thresholds. Network-level protections such as rate limiting and request filtering can help reduce the impact of exploitation attempts, while application-level monitoring should be enhanced to detect unusual resource consumption patterns that might indicate exploitation. Security teams should also consider implementing automated scanning tools to identify applications running vulnerable Spring Framework versions and prioritize remediation efforts accordingly. The vulnerability demonstrates the critical importance of keeping enterprise frameworks updated and maintaining robust input validation practices, as the attack surface for such vulnerabilities continues to expand with the increasing complexity of modern application architectures.