CVE-2018-1000027 Null dereference in n/a

What is CVE-2018-1000027?

CVE-2018-1000027 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 9 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.

Weakness: CWE-476

Which versions are affected by CVE-2018-1000027?

It affects 3 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Squid-Cache Squid.

How do I fix CVE-2018-1000027?

Upgrade to a fixed version.

Is CVE-2018-1000027 being exploited?

There is no known exploitation of CVE-2018-1000027 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-2018-1000027, DEBIAN-CVE-2018-1000027, DLA-1267-1, GHSA-hwhj-rr4w-2xmm, UBUNTU-CVE-2018-1000027.