CVE-2016-0787
Published: 13 April 2016
The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."
Notes
| Author | Note |
|---|---|
| seth-arnold | Debian noted there may be discussion of incomplete fix |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libssh2 Launchpad, Ubuntu, Debian |
precise |
Released
(1.2.8-2ubuntu0.1)
|
| trusty |
Released
(1.4.3-2ubuntu0.1)
|
|
| upstream |
Released
(1.7.0)
|
|
| wily |
Ignored
(end of life)
|
|
| xenial |
Released
(1.5.0-2ubuntu0.1)
|
|
| yakkety |
Released
(1.7.0-1ubuntu0.1)
|
|
|
Patches: upstream: https://github.com/libssh2/libssh2/commit/ca5222ea819cc5ed797860070b4c6c1aeeb28420 upstream: https://github.com/libssh2/libssh2/commit/7934c9ce2a029c43e3642a492d3b9e494d1542be |
||
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:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |