ECDSA Timing Side-Channel Vulnerability in OpenSSL Package
Summary
ALPINE-CVE-2024-13176: Issue summary: A timing side-channel which could potentially allow recovering the private key exists in the ECDSA signature computation. Affects openssl versions < 3.1.8-r0. Fixed in 3.1.8-r0. How to fix ↓
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Background
OpenSSL is a widely-used cryptographic library that provides secure communication over networks. It implements various cryptographic algorithms and protocols, including SSL and TLS. The library is essential for ensuring data integrity and confidentiality in applications. However, certain versions of OpenSSL are vulnerable to a timing side-channel attack during ECDSA signature computations, which could potentially expose private keys.
Vulnerability Detail
The vulnerability arises from a timing side-channel in the ECDSA signature computation process. An attacker could exploit this timing information to recover the private key, provided they have local access to the signing application or a fast network connection with low latency. The issue is particularly pronounced with the NIST P-521 elliptic curve, where a timing signal of approximately 300 nanoseconds can leak information about the nonce value used in the signature. This vulnerability is classified as low severity due to the specific conditions required for exploitation.
How To Fix
Minimum fixed version
3.1.8-r0
This is the first release that contains the fix.
sudo apk add --upgrade opensslTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate patching is not feasible, consider isolating the application from untrusted networks and limiting access to the signing process to trusted users only. Additionally, using alternative elliptic curves that are not affected by this timing issue may mitigate the risk.
Conclusion
The ECDSA timing side-channel vulnerability in OpenSSL poses a risk of private key exposure under certain conditions. It is crucial for users of affected versions to apply the necessary updates to mitigate this risk. Understanding the nature of the vulnerability and implementing recommended fixes or workarounds can help maintain the security of applications relying on OpenSSL.
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FAQ
It is a timing side-channel vulnerability in ECDSA signature computations that could allow an attacker to recover private keys.
Affected versions include OpenSSL in Alpine Linux v3.18, v3.19, v3.20, v3.21, and v3.22.
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Consider implementing workarounds such as isolating the application from untrusted networks and limiting access to trusted users.
The vulnerability is classified as low severity due to the specific conditions required for exploitation, although it should still be addressed promptly.
References
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