Information Exposure Affecting openssl-libs package, versions <2:1.1.1k-9.ksplice1.el8_7



    Attack Complexity High
    Confidentiality High

    Threat Intelligence

    EPSS 0.16% (52nd percentile)
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5.9 medium
Expand this section
5.9 medium
Expand this section
Red Hat
5.9 medium

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  • published 1 Mar 2023
  • disclosed 8 Feb 2023

How to fix?

Upgrade Oracle:8 openssl-libs to version 2:1.1.1k-9.ksplice1.el8_7 or higher.
This issue was patched in ELSA-2023-12213.

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 Oracle. See How to fix? for Oracle:8 relevant fixed versions and status.

A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext across a network in a Bleichenbacher style attack. To achieve a successful decryption an attacker would have to be able to send a very large number of trial messages for decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5, RSA-OEAP and RSASVE.

For example, in a TLS connection, RSA is commonly used by a client to send an encrypted pre-master secret to the server. An attacker that had observed a genuine connection between a client and a server could use this flaw to send trial messages to the server and record the time taken to process them. After a sufficiently large number of messages the attacker could recover the pre-master secret used for the original connection and thus be able to decrypt the application data sent over that connection.