CVE-2016-4476 Denial of service in n/a

What is CVE-2016-4476?

CVE-2016-4476 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 9 May 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

hostapd 0.6.7 through 2.5 and wpa_supplicant 0.6.7 through 2.5 do not reject \n and \r characters in passphrase parameters, which allows remote attackers to cause a denial of service (daemon outage) via a crafted WPS operation.

Weakness: CWE-20

Which versions are affected by CVE-2016-4476?

It affects 3 products.

Products include Canonical Ubuntu Linux, W1.fi Hostapd, W1.fi Wpa Supplicant.

How do I fix CVE-2016-4476?

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-2016-4476 being exploited?

There is no known exploitation of CVE-2016-4476 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-2016-4476, DEBIAN-CVE-2016-4476, GHSA-p986-2574-rgvr, UBUNTU-CVE-2016-4476.