CVE-2018-20685 Missing authorization in n/a

What is CVE-2018-20685?

CVE-2018-20685 is a medium-severity missing authorization vulnerability in Canonical Ubuntu Linux, published on 10 Jan 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-863

Which versions are affected by CVE-2018-20685?

It affects 22 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fujitsu M10-1 Firmware, Fujitsu M10-4 Firmware, Fujitsu M10-4s Firmware, Fujitsu M12-1 Firmware and 16 more.

How do I fix CVE-2018-20685?

Upgrade to a fixed version.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2018-20685 being exploited?

There is no known exploitation of CVE-2018-20685 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2018-20685, DEBIAN-CVE-2018-20685, GHSA-28hp-2gv6-gjp8, MGASA-2019-0067, UBUNTU-CVE-2018-20685.