USN-4551-1: Squid vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• squid3 - Web proxy cache server

Details

Alex Rousskov and Amit Klein discovered that Squid incorrectly handled
certain Content-Length headers. A remote attacker could possibly use this
issue to perform an HTTP request smuggling attack, resulting in cache
poisoning. (CVE-2020-15049)

Amit Klein discovered that Squid incorrectly validated certain data. A
remote attacker could possibly use this issue to perform an HTTP request
smuggling attack, resulting in cache poisoning. (CVE-2020-15810)

Régis Leroy discovered that Squid incorrectly validated certain data. A
remote attacker could possibly use this issue to perform an HTTP request
splitting attack, resulting in cache poisoning. (CVE-2020-15811)

Lubos Uhliarik discovered that Squid incorrectly handled certain Cache
Digest response messages sent by trusted peers. A remote attacker could
possibly use this issue to cause Squid to consume resources, resulting in a
denial of service. (CVE-2020-24606)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04

• squid - 3.5.27-1ubuntu1.9

Ubuntu 16.04

• squid - 3.5.12-1ubuntu7.15

In general, a standard system update will make all the necessary changes.

References

• CVE-2020-15049
• CVE-2020-15810
• CVE-2020-15811
• CVE-2020-24606

Related notices

• USN-4895-1: squid3, squid, squidclient, squid-purge, squid-cgi, squid-common
• USN-4477-1: squid, squidclient, squid-purge, squid-cgi, squid-common