CVE-2018-0732
Publication date 12 June 2018
Last updated 24 July 2024
Ubuntu priority
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).
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| openssl | ||
| 18.04 LTS bionic |
Fixed 1.1.0g-2ubuntu4.1
|
|
| 16.04 LTS xenial |
Fixed 1.0.2g-1ubuntu4.13
|
|
| 14.04 LTS trusty |
Fixed 1.0.1f-1ubuntu2.26
|
|
| openssl098 | ||
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| openssl1.0 | ||
| 18.04 LTS bionic |
Fixed 1.0.2n-1ubuntu5.1
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release |
Patch details
| Package | Patch details |
|---|---|
| openssl |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.5 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-3692-1
- OpenSSL vulnerabilities
- 26 June 2018
- USN-3692-2
- OpenSSL vulnerabilities
- 26 June 2018