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GHSA-p52g-cm5j-mjv4: 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.

ghsa
#vulnerability#git#oracle#ssl
  1. GitHub Advisory Database
  2. GitHub Reviewed
  3. CVE-2022-4304

openssl-src subject to Timing Oracle in RSA Decryption

Moderate severity GitHub Reviewed Published Feb 8, 2023 to the GitHub Advisory Database • Updated Feb 8, 2023

Package

cargo openssl-src (Rust)

Affected versions

< 111.25

>= 300.0, < 300.0.12

Patched versions

111.25

300.0.12

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2022-4304
  • https://rustsec.org/advisories/RUSTSEC-2023-0007.html
  • https://www.openssl.org/news/secadv/20230207.txt

Published to the GitHub Advisory Database

Feb 8, 2023

Published by the National Vulnerability Database

Feb 8, 2023

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