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🛡️ CVE-2022-4304 on Alpine — openssl

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Distribution advisory

This page covers CVE-2022-4304 as tracked by Alpine, for the package openssl. The fix is available in version 3.0.8-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

ALPINE-CVE-2022-4304 is classified as CWE-203: Observable Discrepancy. The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

Affected software

ALPINE-CVE-2022-4304 is recorded against 2 packages.

  • openssl (from 1.0.2 up to 3.0.8-r0)
  • openssl3 (fixed in 3.0.8-r0)

Timeline and source

Published on 8 February 2023 and last revised on 8 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

Other advisories for this package

openssl has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-203: Observable Discrepancy) in other software:

CVE-2022-4304 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2023-02-08
Updated 2026-08-20
Modified 2026-07-08
Fix URL N/A

Affected Packages

Software From version Fixed in
openssl 1.0.2 3.0.8-r0
openssl3 — 3.0.8-r0

Vulnerability Monitoring

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