Information Exposure

Affecting libressl package, versions <2.6.5-r0

Overview

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 function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

References

• CVE Details
• Debian Security Advisory
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• Debian Security Tracker
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• Oracle Security Advisory
• REDHAT
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• RHSA Security Advisory
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• Security Tracker
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• Ubuntu CVE Tracker
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• Ubuntu Security Advisory
• Ubuntu Security Advisory
• Ubuntu Security Advisory