发布时间: 2023年3月17日
修改时间: 2023年3月17日
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.
| NVD | openEuler | |
|---|---|---|
| Confidentiality | High | High |
| Attack Vector | Network | Network |
| CVSS评分 | 5.9 | 5.9 |
| Attack Complexity | High | High |
| Privileges Required | None | None |
| Scope | Unchanged | Unchanged |
| Integrity | None | None |
| User Interaction | None | None |
| Availability | None | None |
| 公告名 | 概要 | 发布时间 |
|---|---|---|
| KylinSec-SA-2023-1204 | 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. | 2023年3月17日 |
| 产品 | 包 | 状态 |
|---|---|---|
| KY3.4-4A | compat-openssl11 | Unaffected |
| KY3.4-5A | compat-openssl11 | Unaffected |
| KY3.5.1 | compat-openssl11 | Unaffected |
| KY3.5.2 | compat-openssl11 | Unaffected |
