Headline
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.
- GitHub Advisory Database
- GitHub Reviewed
- 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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