openbsd openssh CVE-2019-6111 vulnerability in OpenBSD and Other Products
Published on January 31, 2019

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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).

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Vulnerability Analysis

CVE-2019-6111 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2019-6111. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Type

What is a Directory traversal Vulnerability?

The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

CVE-2019-6111 has been classified to as a Directory traversal vulnerability or weakness.


Products Associated with CVE-2019-6111

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2019-6111 are published in these products:

OpenBSD OpenSSH
 
Winscp
 
Canonical Ubuntu Linux
 
Debian Linux
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Enterprise Linux Eus
 
Red Hat Enterprise Linux Server Tus
 
Red Hat Enterprise Linux Server Aus
 
Fedora Project Fedora
 
Apache Mina Sshd
 
FreeBSD
 

Exploit Probability

EPSS
54.41%
Percentile
97.97%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.