Memory-Cache Side-Channel Attack in libgcrypt: CVE-2018-0495 Vulnerability
Summary
ALPINE-CVE-2018-0495: Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign functi... Affects libgcrypt versions < 1.8.3-r0. Fixed in 1.8.3-r0. How to fix ↓
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Background
libgcrypt is a cryptographic library that provides a wide range of cryptographic functions, including encryption, decryption, and digital signatures. It is widely used in various applications for secure data handling. However, certain versions of libgcrypt are vulnerable to a memory-cache side-channel attack, specifically affecting ECDSA signatures, which can compromise the security of cryptographic operations.
Vulnerability Detail
The vulnerability, identified as CVE-2018-0495, allows an attacker to exploit a memory-cache side-channel attack on ECDSA signatures. This issue arises from the lack of blinding during the signing process in the _gcry_ecc_ecdsa_sign function. An attacker with access to the local machine or another virtual machine on the same physical host can potentially discover the ECDSA key, leading to unauthorized access and data breaches. The vulnerability affects libgcrypt versions prior to 1.7.10 and 1.8.x before 1.8.3.
How To Fix
Minimum fixed version
1.8.3-r0
This is the first release that contains the fix.
sudo apk add --upgrade libgcryptTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider implementing additional security measures such as isolating sensitive operations to dedicated hardware or using alternative cryptographic libraries that are not affected by this vulnerability until an update can be applied.
Conclusion
CVE-2018-0495 represents a significant security risk for applications using vulnerable versions of libgcrypt. It is crucial to update to the patched version to mitigate the risk of key compromise through side-channel attacks. Regular monitoring and vulnerability management practices, such as using tools like Vulert, can help maintain the security of your software.
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FAQ
CVE-2018-0495 is a vulnerability in libgcrypt that allows a memory-cache side-channel attack on ECDSA signatures, potentially compromising cryptographic keys.
libgcrypt versions prior to 1.7.10 and 1.8.x before 1.8.3 are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score of CVE-2018-0495 is 4.7, indicating a moderate severity level.
If immediate updates are not possible, consider implementing additional security measures or using alternative libraries until the update can be applied.
References
Related vulnerabilities
Recent vulnerabilities recorded for libgcrypt.
