CVE-2019-18677 Open redirect in n/a

What is CVE-2019-18677?

CVE-2019-18677 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 26 Nov 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

An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.

Weakness: CWE-352

Which versions are affected by CVE-2019-18677?

It affects 3 products.

Products include Canonical Ubuntu Linux, Fedoraproject Fedora, Squid-Cache Squid.

How do I fix CVE-2019-18677?

Apply the vendor's patch.

Is CVE-2019-18677 being exploited?

There is no known exploitation of CVE-2019-18677 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 DEBIAN-CVE-2019-18677, GHSA-mm65-p7g9-c5hr, UBUNTU-CVE-2019-18677.