Debian LTS Advisory ([SECURITY] [DLA 1728-1] openssh security update)

Published: 2019-03-25 22:00:00
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:M/Au:N/C:N/I:P/A:P

Summary:
The remote host is missing an update for the 'openssh' Linux Distribution Package(s) announced via the DSA-1728-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Multiple scp client vulnerabilities have been discovered in OpenSSH, the premier connectivity tool for secure remote shell login and secure file transfer. CVE-2018-20685 In scp.c, the scp client allowed remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact was modifying the permissions of the target directory on the client side. CVE-2019-6109 Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) was able to employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affected refresh_progress_meter() in progressmeter.c. CVE-2019-6111 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 performed cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) was able to overwrite arbitrary files in the scp client target directory. If recursive operation (-r) was performed, the server was able to manipulate subdirectories, as well (for example, to overwrite the .ssh/authorized_keys file).

Affected Versions:
'openssh' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 8 'Jessie', these problems have been fixed in version 1:6.7p1-5+deb8u8. We recommend that you upgrade your openssh Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2018-20685
https://nvd.nist.gov/vuln/detail/CVE-2019-6109
https://nvd.nist.gov/vuln/detail/CVE-2019-6111

References:

https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html
https://security-tracker.debian.org/tracker/DLA-1728-1

Severity
Medium
CVSS Score
5.8
Published
2019-03-25
Modified
2019-03-27
Category
Debian Local Security Checks

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