During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-0732 from the MITRE CVE dictionary dictionary and NIST NVD.
| CVSS3 Base Score | 4.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | Low |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (openssl) | RHSA-2018:3221 | 2018-10-30 |
| Red Hat OpenShift Application Runtimes 1.0 (rhoar-nodejs) | RHSA-2018:2552 | 2018-08-22 |
| Red Hat OpenShift Application Runtimes 1.0 (rhoar-nodejs) | RHSA-2018:2553 | 2018-08-22 |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss Web Server 3 | openssl | Affected |
| Red Hat JBoss EWS 2 | openssl | Will not fix |
| Red Hat JBoss EAP 6 | openssl | Will not fix |
| Red Hat JBoss EAP 5 | openssl | Under investigation |
| Red Hat JBoss Core Services 1 | openssl | Affected |
| Red Hat Enterprise Linux 7 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 7 | OVMF | Under investigation |
| Red Hat Enterprise Linux 6 | openssl | Will not fix |
| Red Hat Enterprise Linux 6 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 5 | openssl | Will not fix |
| Red Hat Enterprise Linux 5 | openssl097a | Will not fix |
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