USN-4289-1: Squid vulnerabilities

Releases

• Ubuntu 19.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• squid - Web proxy cache server
• squid3 - Web proxy cache server

Details

Jeriko One discovered that Squid incorrectly handled memory when connected
to an FTP server. A remote attacker could possibly use this issue to obtain
sensitive information from Squid memory. (CVE-2019-12528)

Regis Leroy discovered that Squid incorrectly handled certain HTTP
requests. A remote attacker could possibly use this issue to access server
resources prohibited by earlier security filters. (CVE-2020-8449)

Guido Vranken discovered that Squid incorrectly handled certain buffer
operations when acting as a reverse proxy. A remote attacker could use
this issue to cause Squid to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2020-8450)

Aaron Costello discovered that Squid incorrectly handled certain NTLM
authentication credentials. A remote attacker could possibly use this issue
to cause Squid to crash, resulting in a denial of service. (CVE-2020-8517)

Update instructions

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

Ubuntu 19.10

• squid - 4.8-1ubuntu2.2

Ubuntu 18.04

• squid - 3.5.27-1ubuntu1.5

Ubuntu 16.04

• squid - 3.5.12-1ubuntu7.10

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

References

• CVE-2019-12528
• CVE-2020-8449
• CVE-2020-8450
• CVE-2020-8517