Information Exposure Affecting openssl package, versions <1:1.0.1k-14.89.amzn1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.36% (58th percentile)

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  • Snyk IDSNYK-AMZN201803-OPENSSL-1693692
  • published27 Sept 2021
  • disclosed3 Mar 2016

Introduced: 3 Mar 2016

CVE-2016-0702  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 openssl to version 1:1.0.1k-14.89.amzn1 or higher.
This issue was patched in ALAS-2016-661.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 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

CVSS Base Scores

version 3.1