[3.10] openssh: Multiple vulnerabilities (CVE-2018-20685, CVE-2019-6109, CVE-2019-6111)
CVE-2018-20685: In OpenSSH 7.9, scp.c in the scp client allows
remote SSH servers to bypass intended access restrictions via the
filename of . or an empty filename. The impact is modifying the
permissions of the target directory on the client side.
References:
https://nvd.nist.gov/vuln/detail/CVE-2018-20685
https://marc.info/?l=oss-security&m=154745764812881&w=2
Patch:
https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2
CVE-2019-6109: An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affects refresh_progress_meter() in progressmeter.c.
References:
https://nvd.nist.gov/vuln/detail/CVE-2019-6109
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
Patch:
https://github.com/openssh/openssh-portable/commit/8976f1c4b2721c26e878151f52bdf346dfe2d54c
possibly additionally needed:
https://github.com/openssh/openssh-portable/commit/bdc6c63c80b55bcbaa66b5fde31c1cb1d09a41eb
CVE-2019-6111: 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).
References:
https://nvd.nist.gov/vuln/detail/CVE-2019-6111
Patch:
https://github.com/openssh/openssh-portable/commit/391ffc4b9d31fa1f4ad566499fef9176ff8a07dc
(from redmine: issue id 9996, created on 2019-02-20, closed on 2019-03-05)
- Relations:
- parent #9995 (closed)
- Changesets:
- Revision 9730fd96 on 2019-03-01T14:30:52Z:
main/openssh: security fixes
CVE-2018-20685, CVE-2019-6109, CVE-2019-6111
Rebase HPN patch
Fixes #9996- Revision e231e6be on 2019-03-04T07:40:56Z:
main/openssh: security fixes
CVE-2018-20685, CVE-2019-6109, CVE-2019-6111
Rebase HPN patch
Fixes #9996