CVE-2019-1563

Description

In situations where an attacker receives automated notification of the success or failure of a decryption attempt an attacker, after sending a very large number of messages to be decrypted, can recover a CMS/PKCS7 transported encryption key or decrypt any RSA encrypted message that was encrypted with the public RSA key, using a Bleichenbacher padding oracle attack. Applications are not affected if they use a certificate together with the private RSA key to the CMS_decrypt or PKCS7_decrypt functions to select the correct recipient info to decrypt. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).

How to fix CVE-2019-1563

To remediate CVE-2019-1563, upgrade the affected package to a fixed version below.

• —upgrade to 1.1.1d-r0 or later
• —upgrade to 1.1.1d-r1 or later
• —upgrade to 1.1.1d-1 or later

Is CVE-2019-1563 being exploited?

Low — EPSS is 1.1%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 1.1.1d-r0
• from 0, < 1.1.1d-r1
• from 0, < 1.1.1d-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-1563
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-1563