GSA_kwCzR0hTQS1wNTJnLWNtNWotbWp2NM4AAxfu

Moderate EPSS: 0.0023% (0.45861 Percentile) EPSS:

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openssl-src subject to Timing Oracle in RSA Decryption

Affected Packages	Affected Versions	Fixed Versions
cargo:openssl-src	>= 300.0.0, < 300.0.12, < 111.25.0	300.0.12, 111.25.0
13 Dependent packages 3,600 Dependent repositories 44,156,620 Downloads total Affected Version Ranges All affected versions 110.0.0, 110.0.0, 110.0.1, 110.0.2, 110.0.3, 110.0.4, 110.0.5, 110.0.6, 110.0.7, 111.0.0, 111.0.1, 111.1.0, 111.1.1, 111.2.1, 111.3.0, 111.4.0, 111.5.0, 111.6.0, 111.6.1, 111.7.0, 111.8.0, 111.8.1, 111.9.0, 111.10.0, 111.10.1, 111.10.2, 111.11.0, 111.12.0, 111.13.0, 111.14.0, 111.15.0, 111.16.0, 111.17.0, 111.18.0, 111.19.0, 111.20.0, 111.21.0, 111.22.0, 111.23.0, 111.24.0, 300.0.0, 300.0.1, 300.0.2, 300.0.3, 300.0.4, 300.0.5, 300.0.6, 300.0.7, 300.0.8, 300.0.9, 300.0.10, 300.0.11 All unaffected versions 111.25.0, 111.25.1, 111.25.2, 111.25.3, 111.26.0, 111.27.0, 111.28.0, 111.28.1, 111.28.2, 300.0.12, 300.0.13, 300.1.0, 300.1.1, 300.1.2, 300.1.3, 300.1.4, 300.1.5, 300.1.6, 300.2.0, 300.2.1, 300.2.2, 300.2.3, 300.3.0, 300.3.1, 300.3.2, 300.4.0, 300.4.1, 300.4.2, 300.5.0, 300.5.1

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:

ecosyste.ms

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GSA_kwCzR0hTQS1wNTJnLWNtNWotbWp2NM4AAxfu

openssl-src subject to Timing Oracle in RSA Decryption

Affected Version Ranges

All affected versions

All unaffected versions

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