CVE-2020-15811 Other in n/a

What is CVE-2020-15811?

CVE-2020-15811 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 2 Sep 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.

Weakness: CWE-697

Which versions are affected by CVE-2020-15811?

It affects 5 products.

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

How do I fix CVE-2020-15811?

Upgrade to a fixed version.

Is CVE-2020-15811 being exploited?

There is no known exploitation of CVE-2020-15811 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-2020-15811, DEBIAN-CVE-2020-15811, GHSA-c7p8-xqhm-49wv, UBUNTU-CVE-2020-15811.