PT-2020-6862 · Openssl+12 · Openssl+12
CVSS v2.0
7.8
High
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
OpenSSL (affected versions not specified)
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.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
DoS
Side Channel Attack
Double Free
NULL Pointer Dereference
Incorrect Type Conversion or Cast
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Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Freebsd
Ibm Aix
Linuxmint
Openssl
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu