Information Exposure Affecting openssl package, versions <0:1.0.1e-42.el6_7.4


high

Snyk CVSS

    Attack Complexity High

    Threat Intelligence

    EPSS 0.15% (52nd percentile)
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NVD
5.1 medium
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Red Hat
4 medium

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  • Snyk ID SNYK-CENTOS6-OPENSSL-2127929
  • published 26 Jul 2021
  • disclosed 1 Mar 2016

How to fix?

Upgrade Centos:6 openssl to version 0:1.0.1e-42.el6_7.4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Centos. See How to fix? for Centos:6 relevant fixed versions and status.

The MOD_EXP_CTIME_COPY_FROM_PREBUF function in crypto/bn/bn_exp.c in OpenSSL 1.0.1 before 1.0.1s and 1.0.2 before 1.0.2g does not properly consider cache-bank access times during modular exponentiation, which makes it easier for local users to discover RSA keys by running a crafted application on the same Intel Sandy Bridge CPU core as a victim and leveraging cache-bank conflicts, aka a "CacheBleed" attack.

References