Information Exposure Affecting openssl package, versions <1.1.1t-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.18% (55th percentile)

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  • Snyk IDSNYK-ALPINE314-OPENSSL-3314652
  • published8 Feb 2023
  • disclosed8 Feb 2023

Introduced: 8 Feb 2023

CVE-2022-4304  (opens in a new tab)
CWE-203  (opens in a new tab)

How to fix?

Upgrade Alpine:3.14 openssl to version 1.1.1t-r0 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 Alpine. See How to fix? for Alpine:3.14 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.

CVSS Scores

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