Denial-of-Service Vulnerability in libspring-java Package
Summary
DEBIAN-CVE-2023-20861: In Spring Framework versions 6.0.0 - 6.0.6, 5.3.0 - 5.3.25, 5.2.0.RELEASE - 5.2.22.RELEASE, and older unsupported versions, it is possible for a user to provide a specially crafted SpEL expression that may cause a denial... Affects libspring-java versions 4.3.30-1 – 4.3.30-3. No fix is published. How to fix ↓
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Background
The libspring-java package is a core component of the Spring Framework, which is widely used for building enterprise-level applications in Java. It provides comprehensive infrastructure support for developing Java applications, including features like dependency injection, transaction management, and aspect-oriented programming. However, certain versions of this package are susceptible to a vulnerability that can lead to denial-of-service (DoS) conditions, impacting application availability.
Vulnerability Detail
In Spring Framework versions 6.0.0 - 6.0.6, 5.3.0 - 5.3.25, 5.2.0.RELEASE - 5.2.22.RELEASE, and older unsupported versions, it is possible for a user to provide a specially crafted Spring Expression Language (SpEL) expression. This crafted expression can exploit the framework's evaluation mechanism, potentially leading to a denial-of-service (DoS) condition. The vulnerability arises from improper handling of these expressions, which can consume excessive resources and disrupt normal application operations.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, you can restrict the use of SpEL expressions in your application until you can upgrade to a secure version. This can be done by validating and sanitizing user inputs that may be processed as SpEL expressions.
Conclusion
The libspring-java package has a critical vulnerability that can lead to denial-of-service conditions when specific SpEL expressions are exploited. It is crucial to update to a patched version to ensure the security and availability of your applications. Implementing workarounds and monitoring for vulnerabilities using tools like Vulert can further enhance your security posture.
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FAQ
The vulnerability allows for denial-of-service conditions through specially crafted SpEL expressions.
Affected versions include 6.0.0 - 6.0.6, 5.3.0 - 5.3.25, and 5.2.0.RELEASE - 5.2.22, along with older unsupported versions.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If immediate updating is not possible, consider implementing input validation and sanitization to mitigate the risk of exploitation.
Detailed information can be found in the CVE report at https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-20861.json.
References
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