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PostPosted: Tue Jul 11, 2017 6:26 pm    Post subject: [ GLSA 201706-21 ] nettle Reply with quote

Gentoo Linux Security Advisory

Title: nettle: Information disclosure (GLSA 201706-21)
Severity: normal
Exploitable: local, remote
Date: 2017-06-22
Bug(s): #590484
ID: 201706-21

Synopsis

A cache-related side channel vulnerability was found in nettle
which might allow an attacker to obtain sensitive information.


Background

Nettle is a cryptographic library that is designed to fit easily in
almost any context: In cryptographic toolkits for object-oriented
languages, such as C++, Python, or Pike, in applications like lsh or
GnuPG, or even in kernel space.


Affected Packages

Package: dev-libs/nettle
Vulnerable: < 3.2-r1
Unaffected: >= 3.2-r1
Architectures: All supported architectures


Description

It was found that nettle’s RSA and DSA decryption code was vulnerable
to cache-related side channel attacks.
See the referenced technical paper “Cache Attacks Enable Bulk Key
Recovery on the Cloud” below for details.


Impact

An attacker could recover the private key from a co-located
virtual-machine instance.


Workaround

There is no known workaround at this time.

Resolution

All nettle users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=dev-libs/nettle-3.2-r1"
   


References

CVE-2016-6489
Cache Attacks Enable Bulk
Key Recovery on the Cloud
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