CVE-2017-6056 Denial of service in n/a

What is CVE-2017-6056?

CVE-2017-6056 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 17 Feb 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

It was discovered that a programming error in the processing of HTTPS requests in the Apache Tomcat servlet and JSP engine may result in denial of service via an infinite loop. The denial of service is easily achievable as a consequence of backporting a CVE-2016-6816 fix but not backporting the fix for Tomcat bug 57544. Distributions affected by this backporting issue include Debian (before 7.0.56-3+deb8u8 and 8.0.14-1+deb8u7 in jessie) and Ubuntu.

Weakness: CWE-835

Which versions are affected by CVE-2017-6056?

It affects 2 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux.

How do I fix CVE-2017-6056?

Apply the vendor's patch.

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-2017-6056 being exploited?

There is no known exploitation of CVE-2017-6056 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 DLA-823-1, DSA-3787-1, DSA-3788-1, GHSA-vf6r-cgfg-q96j, UBUNTU-CVE-2017-6056, USN-3204-1.