CVE-2019-6111
Published: 14 January 2019
An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the scp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file).
Notes
| Author | Note |
|---|---|
| seth-arnold | openssh-ssh1 is provided for compatibility with old devices that cannot be upgraded to modern protocols. Thus we may not provide security support for this package if doing so would prevent access to equipment. |
| mdeslaur | The recommended workaround for this issue is to switch to using sftp instead of scp. The updates in USN-3885-1 inverted two CVE numbers by accident. The initial USN was incomplete and did not include the second commit. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
openssh-ssh1 Launchpad, Ubuntu, Debian |
groovy |
Ignored
(end of life)
|
| hirsute |
Ignored
(end of life)
|
|
| kinetic |
Ignored
(end of life, was needs-triage)
|
|
| bionic |
Needs triage
|
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Ignored
(end of life)
|
|
| eoan |
Ignored
(end of life)
|
|
| focal |
Needs triage
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Needs triage
|
|
| lunar |
Needs triage
|
|
| trusty |
Does not exist
|
|
| upstream |
Ignored
(frozen on openssh 7.5p)
|
|
| xenial |
Does not exist
|
|
|
openssh Launchpad, Ubuntu, Debian |
impish |
Not vulnerable
(1:7.9p1-10)
|
| groovy |
Not vulnerable
(1:7.9p1-10)
|
|
| kinetic |
Not vulnerable
(1:7.9p1-10)
|
|
| bionic |
Released
(1:7.6p1-4ubuntu0.3)
|
|
| cosmic |
Released
(1:7.7p1-4ubuntu0.3)
|
|
| disco |
Not vulnerable
(1:7.9p1-10)
|
|
| eoan |
Not vulnerable
(1:7.9p1-10)
|
|
| focal |
Not vulnerable
(1:7.9p1-10)
|
|
| hirsute |
Not vulnerable
(1:7.9p1-10)
|
|
| jammy |
Not vulnerable
(1:7.9p1-10)
|
|
| lunar |
Not vulnerable
(1:7.9p1-10)
|
|
| trusty |
Released
(1:6.6p1-2ubuntu2.13)
|
|
| upstream |
Needs triage
|
|
| xenial |
Released
(1:7.2p2-4ubuntu2.8)
|
|
|
Patches: upstream: https://github.com/openssh/openssh-portable/commit/391ffc4b9d31fa1f4ad566499fef9176ff8a07dc upstream: https://github.com/openssh/openssh-portable/commit/3d896c157c722bc47adca51a58dca859225b5874 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6111
- https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
- https://lists.mindrot.org/pipermail/openssh-unix-dev/2019-January/037459.html
- https://ubuntu.com/security/notices/USN-3885-1
- https://ubuntu.com/security/notices/USN-3885-2
- NVD
- Launchpad
- Debian