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CVE-2019-6111

Status Candidate

Overview

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).

Related Files

Red Hat Security Advisory 2019-3702-01
Posted Nov 6, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-3702-01 - OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Character encoding and input validation flaws were addressed.

tags | advisory, protocol
systems | linux, redhat, unix
advisories | CVE-2018-20685, CVE-2019-6109, CVE-2019-6111
MD5 | abff3d3f524915f5094636070f7aaf3c
Gentoo Linux Security Advisory 201903-16
Posted Mar 20, 2019
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201903-16 - Multiple vulnerabilities have been found in OpenSSH, the worst of which could allow a remote attacker to gain unauthorized access. Versions less than 7.9_p1-r4 are affected.

tags | advisory, remote, vulnerability
systems | linux, gentoo
advisories | CVE-2018-20685, CVE-2019-6109, CVE-2019-6110, CVE-2019-6111
MD5 | 87bd4d4026e3b8a5385b4e39b0a9bafc
Ubuntu Security Notice USN-3885-2
Posted Mar 4, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3885-2 - USN-3885-1 fixed vulnerabilities in OpenSSH. It was discovered that the fix for CVE-2019-6111 turned out to be incomplete. This update fixes the problem. Harry Sintonen discovered multiple issues in the OpenSSH scp utility. If a user or automated system were tricked into connecting to an untrusted server, a remote attacker could possibly use these issues to write to arbitrary files, change directory permissions, and spoof client output. Various other issues were also addressed.

tags | advisory, remote, arbitrary, spoof, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-6111
MD5 | f34497e7fb170dcf3d9ac60a51149cd4
Debian Security Advisory 4387-2
Posted Mar 4, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4387-2 - It was found that a security update (DSA-4387-1) of OpenSSH, an implementation of the SSH protocol suite, was incomplete. This update did not completely fix CVE-2019-6111, an arbitrary file overwrite vulnerability in the scp client implementing the SCP protocol.

tags | advisory, arbitrary, protocol
systems | linux, debian
advisories | CVE-2019-6111
MD5 | 88cea46d231b8279eecaac5b7333b593
Debian Security Advisory 4387-1
Posted Feb 11, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4387-1 - Harry Sintonen from F-Secure Corporation discovered multiple vulnerabilities in OpenSSH, an implementation of the SSH protocol suite. All the vulnerabilities are in found in the scp client implementing the SCP protocol.

tags | advisory, vulnerability, protocol
systems | linux, debian
advisories | CVE-2018-20685, CVE-2019-6109, CVE-2019-6111
MD5 | 186034ec42a5ba2b80b00bd110f34130
SSHtranger Things SCP Client File Issue
Posted Jan 18, 2019
Authored by Mark E. Haase

SCP clients have an issue where additional files can be copied over without your knowledge.

tags | exploit
advisories | CVE-2019-6110, CVE-2019-6111
MD5 | 626b8f9ed7ac34747bdfe8ac1d82a454
SCP Server Verification Issues
Posted Jan 16, 2019
Authored by Harry Sintonen

Many scp clients fail to verify if the objects returned by the scp server match those it asked for. This issue dates back to 1983 and rcp, on which scp is based. A separate flaw in the client allows the target directory attributes to be changed arbitrarily. Finally, two vulnerabilities in clients may allow server to spoof the client output.

tags | advisory, spoof, vulnerability
advisories | CVE-2000-0992, CVE-2018-20684, CVE-2018-20685, CVE-2019-6109, CVE-2019-6110, CVE-2019-6111
MD5 | d3b18a0146f2be70c357e933eb037d03
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