Information Exposure Affecting openssl package, versions <1.0.2g-1ubuntu2


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.73% (81st percentile)

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  • Snyk IDSNYK-UBUNTU1604-OPENSSL-374151
  • published3 Mar 2016
  • 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 Ubuntu:16.04 openssl to version 1.0.2g-1ubuntu2 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 Ubuntu. See How to fix? for Ubuntu:16.04 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 Scores

version 3.1