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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
| Attack Vector | NETWORK |
|---|---|
| Attack Complexity | HIGH |
| Privileges Required | NONE |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | HIGH |
| Integrity Impact | NONE |
| Availability Impact | NONE |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-203
|
| 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary |
en
CWE-203
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| openssl | openssl | * | <built-in method update of dict object at 0x7b070c91bc00> | Application |
| openssl | openssl | * | <built-in method update of dict object at 0x7b06e87c10c0> | Application |
| openssl | openssl | * | <built-in method update of dict object at 0x7b070c9e4080> | Application |
| stormshield | endpoint_security | * | <built-in method update of dict object at 0x7b06e9207dc0> | Application |
| stormshield | sslvpn | * | <built-in method update of dict object at 0x7b06e8250d80> | Application |
| stormshield | stormshield_network_security | * | <built-in method update of dict object at 0x7b070c9f08c0> | Application |
| stormshield | stormshield_network_security | * | <built-in method update of dict object at 0x7b070c9f1fc0> | Application |
| stormshield | stormshield_network_security | * | <built-in method update of dict object at 0x7b070c6a18c0> | Application |
| stormshield | stormshield_network_security | * | <built-in method update of dict object at 0x7b070c9f2580> | Application |
| stormshield | stormshield_network_security | * | <built-in method update of dict object at 0x7b072ce81780> | Application |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:a:stormshield:endpoint_security:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:a:stormshield:sslvpn:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:* |