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Ubuntu Security Notice USN-4059-2
July 17, 2019

squid3 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Squid.

Software Description:
- squid3: Web proxy cache server

Details:

USN-4059-1 and USN-3557-1 fixed several vulnerabilities in Squid. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Louis Dion-Marcil discovered that Squid incorrectly handled certain
 Edge Side Includes (ESI) responses. A malicious remote server could
 possibly cause Squid to crash, resulting in a denial of service.
 (CVE-2018-1000024)

 Louis Dion-Marcil discovered that Squid incorrectly handled certain
 Edge Side Includes (ESI) responses. A malicious remote server could
 possibly cause Squid to crash, resulting in a denial of service.
 (CVE-2018-1000027)

 It was discovered that Squid incorrectly handled the cachemgr.cgi web
 module. A remote attacker could possibly use this issue to conduct
 cross-site scripting (XSS) attacks. (CVE-2019-13345)

Update instructions:

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

Ubuntu 12.04 ESM:
  squid3                          3.1.19-1ubuntu3.12.04.9

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

References:
  https://usn.ubuntu.com/4059-2
  https://usn.ubuntu.com/4059-1
  CVE-2018-1000024, CVE-2018-1000027, CVE-2019-13345