CVE-2018-6540 Denial of service in n/a

What is CVE-2018-6540?

CVE-2018-6540 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 2 Feb 2018. 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 ZZIPlib 0.13.67, there is a bus error caused by loading of a misaligned address in the zzip_disk_findfirst function of zzip/mmapped.c. Remote attackers could leverage this vulnerability to cause a denial of service via a crafted zip file.

Which versions are affected by CVE-2018-6540?

It affects 2 products.

Products include Canonical Ubuntu Linux, Gdraheim Zziplib.

How do I fix CVE-2018-6540?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-6540 being exploited?

There is no known exploitation of CVE-2018-6540 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-2018-6540, GHSA-g9wc-x35v-4258, UBUNTU-CVE-2018-6540.