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Information Exposure Affecting openssl-libs package, versions <1:1.0.2k-19.amzn2.0.1

0.0
medium

Snyk CVSS

    Attack Complexity High
    Confidentiality High

    Threat Intelligence

    EPSS 0.81% (82nd percentile)
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NVD
5.9 medium
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SUSE
4 medium
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Red Hat
5.9 medium

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  • Snyk ID SNYK-AMZN2-OPENSSLLIBS-1676764
  • published 27 Sep 2021
  • disclosed 27 Feb 2019
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Introduced: 27 Feb 2019

CVE-2019-1559 Open this link in a new tab
CWE-203 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2 openssl-libs to version 1:1.0.2k-19.amzn2.0.1 or higher.
This issue was patched in ALAS2-2019-1362.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl-libs package and not the openssl-libs package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

References