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CVE-2018-20685

Status Candidate

Overview

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.

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
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
Ubuntu Security Notice USN-3885-1
Posted Feb 7, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3885-1 - 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.

tags | advisory, remote, arbitrary, spoof
systems | linux, ubuntu
advisories | CVE-2018-20685
MD5 | 558941eba51b7779c1347a96125fa2cc
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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