Sensitive Information Exposure in Crypto++ Package - CVE-2016-7420
Summary
UBUNTU-CVE-2016-7420: Crypto++ (aka cryptopp) through 5.6.4 does not document the requirement for a compile-time NDEBUG definition disabling the many assert calls that are unintended in production use, which might allow context-dependent atta... Affects libcrypto++ versions 5.6.1-6 – 5.6.1-6+deb8u3ubuntu0.1~esm1. No fix is published. How to fix ↓
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Background
Crypto++ (also known as cryptopp) is a widely used C++ library that provides a rich set of cryptographic algorithms and schemes. It is designed for developers who need to implement secure communications and data protection in their applications. The library is known for its performance and flexibility, but it has a critical vulnerability that can expose sensitive information if not properly configured.
Vulnerability Detail
The vulnerability identified as CVE-2016-7420 arises from the lack of documentation regarding the necessity of a compile-time NDEBUG definition. This oversight can lead to the inclusion of numerous assert calls in production builds, which are not intended for such environments. If an assertion fails, it may allow context-dependent attackers to access sensitive information by leveraging process memory, potentially exposing data through core dumps. The vulnerability affects versions of Crypto++ up to 5.6.4.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, developers can define the NDEBUG macro during compilation to disable assert calls. This can be done by adding the following flag to the compiler: -DNDEBUG. However, this is not a permanent fix and updating the package is strongly recommended.
Conclusion
CVE-2016-7420 is a significant vulnerability in the Crypto++ library that can lead to sensitive information exposure. It is crucial for developers to understand the implications of this vulnerability and take appropriate steps to mitigate the risks by updating to the latest patched versions or applying workarounds.
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FAQ
CVE-2016-7420 is a vulnerability in the Crypto++ library that can lead to sensitive information exposure due to improper handling of assert calls in production environments.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Check your application against the vulnerability using the Vulert playground at Vulert Scanner.
The primary risk is the potential exposure of sensitive information from process memory, which can be exploited by attackers if they gain access to core dumps.
Yes, there are patched versions of the Crypto++ library available for various Ubuntu distributions. It is recommended to update to these versions.
If an immediate update is not possible, you can define the NDEBUG macro during compilation to disable assert calls as a temporary workaround.
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