5.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2022-4304

CVE-2022-4304: openssl-src subject to Timing Oracle in RSA Decryption

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.

(GitHub Advisory)

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CVE-2022-4304

CVE-2022-4304:

5.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
openssl-src	rust	< 111.25.0	111.25.0
openssl-src	rust	>= 300.0.0, < 300.0.12	300.0.12

Technical Details

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Root Cause Analysis

The analysis is based on the vulnerability description (CVE-2022-4304), which points to a timing oracle in OpenSSL's RSA decryption affecting PKCS#1 v1.5, RSA-OEAP, and RSASVE padding modes. Commit information could not be retrieved using the get_commit_infos tool. However, manual inspection of the commit details (messages and changed files) for the patch URLs (obtained from openssl-library.org) revealed that the fixes involved making RSA padding checks constant-time by adding dummy decryption operations in error paths. The functions modified by these patches, specifically those performing the padding checks (RSA_padding_check_PKCS1_type_2 for PKCS#1 v1.5, RSA_padding_check_PKCS1_OAEP_mgf1 for OAEP, and RSA_verify_PKCS1_PSS_mgf1 for PSS/RSASVE in OpenSSL 3.0), are identified as vulnerable. These functions would be in the execution path when an attacker attempts to exploit the timing oracle by sending crafted messages.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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