CVE-2019-1559
Published: 26 February 2019
If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).
Notes
| Author | Note |
|---|---|
| mdeslaur | doesn't affect 1.1.x this fix is a workaround for applications that call SSL_shutdown() twice even if a protocol error has occurred upstream fix uses error handling mechanism introduced in 1.0.2, which isn't available in 1.0.1f. While we are unlikely to fix this issue in Ubuntu 14.04 LTS, marking as deferred for now in case the vulnerable applications are identified. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
openssl1.0 Launchpad, Ubuntu, Debian |
xenial |
Does not exist
|
| bionic |
Released
(1.0.2n-1ubuntu5.3)
|
|
| cosmic |
Released
(1.0.2n-1ubuntu6.2)
|
|
| disco |
Does not exist
|
|
| eoan |
Does not exist
|
|
| focal |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
|
nodejs Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(uses system openssl1.0)
|
| cosmic |
Not vulnerable
(uses system openssl1.0)
|
|
| disco |
Not vulnerable
(uses system openssl1.1)
|
|
| eoan |
Not vulnerable
(uses system openssl1.1)
|
|
| focal |
Not vulnerable
(uses system openssl1.1)
|
|
| trusty |
Not vulnerable
(uses system openssl)
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(uses system openssl)
|
|
|
openssl Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(1.1.0g-2ubuntu4.3)
|
| cosmic |
Not vulnerable
(1.1.1-1ubuntu2.1)
|
|
| disco |
Not vulnerable
(1.1.1a-1ubuntu2)
|
|
| eoan |
Not vulnerable
(1.1.1a-1ubuntu2)
|
|
| focal |
Not vulnerable
(1.1.1a-1ubuntu2)
|
|
| trusty |
Released
(1.0.1f-1ubuntu2.27+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Needs triage
|
|
| xenial |
Released
(1.0.2g-1ubuntu4.15)
|
|
|
Patches: upstream: https://github.com/openssl/openssl/commit/e9bbefbf0f24c57645e7ad6a5a71ae649d18ac8e |
||
|
openssl098 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| eoan |
Does not exist
|
|
| focal |
Does not exist
|
|
| trusty |
Does not exist
(trusty was needs-triage)
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| 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 |