CVE-2018-0734
Publication date 30 October 2018
Last updated 25 August 2025
Ubuntu priority
Description
The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| openssl | ||
| 20.04 LTS focal |
Fixed 1.1.1a-1ubuntu2
|
|
| 18.04 LTS bionic |
Fixed 1.1.0g-2ubuntu4.3
|
|
| 16.04 LTS xenial |
Fixed 1.0.2g-1ubuntu4.14
|
|
| 14.04 LTS trusty |
Fixed 1.0.1f-1ubuntu2.27
|
|
| openssl098 | ||
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| openssl1.0 | ||
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Fixed 1.0.2n-1ubuntu5.2
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release |
Notes
mdeslaur
there are other similar commits in crypto/dsa/dsa_ossl.c that likely need backporting also. upstream advisory was ammended with more commits
Patch details
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.9 · Medium
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-3840-1
- OpenSSL vulnerabilities
- 6 December 2018