Ubuntu Security Notice 4213-1 - Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled certain URN requests. A remote attacker could possibly use this issue to bypass access checks and access restricted servers. This issue was only addressed in Ubuntu 19.04 and Ubuntu 19.10. Jeriko One discovered that Squid incorrectly handed URN responses. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.
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Ubuntu Security Notice USN-4213-1
December 04, 2019
squid, squid3 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Squid.
Software Description:
- squid: Web proxy cache server
- squid3: Web proxy cache server
Details:
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled certain URN requests. A remote attacker could possibly use this
issue to bypass access checks and access restricted servers. This issue was
only addressed in Ubuntu 19.04 and Ubuntu 19.10. (CVE-2019-12523)
Jeriko One discovered that Squid incorrectly handed URN responses. A remote
attacker could use this issue to cause Squid to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2019-12526)
Alex Rousskov discovered that Squid incorrectly handled certain strings. A
remote attacker could possibly use this issue to cause Squid to crash,
resulting in a denial of service. This issue only affected Ubuntu 19.04.
(CVE-2019-12854)
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled certain input. A remote attacker could use this issue to cause
Squid to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue was only addressed in Ubuntu 19.04 and Ubuntu
19.10. (CVE-2019-18676)
Kristoffer Danielsson discovered that Squid incorrectly handled certain
messages. This issue could result in traffic being redirected to origins
it should not be delivered to. (CVE-2019-18677)
RĂ©gis Leroy discovered that Squid incorrectly handled certain HTTP
request headers. A remote attacker could use this to smuggle HTTP requests
and corrupt caches with arbitrary content. (CVE-2019-18678)
David Fifield discovered that Squid incorrectly handled HTTP Digest
Authentication. A remote attacker could possibly use this issue to obtain
pointer contents and bypass ASLR protections. (CVE-2019-18679)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 19.10:
squid 4.8-1ubuntu2.1
Ubuntu 19.04:
squid 4.4-1ubuntu2.3
Ubuntu 18.04 LTS:
squid3 3.5.27-1ubuntu1.4
Ubuntu 16.04 LTS:
squid3 3.5.12-1ubuntu7.9
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4213-1
CVE-2019-12523, CVE-2019-12526, CVE-2019-12854, CVE-2019-18676,
CVE-2019-18677, CVE-2019-18678, CVE-2019-18679
Package Information:
https://launchpad.net/ubuntu/+source/squid/4.8-1ubuntu2.1
https://launchpad.net/ubuntu/+source/squid/4.4-1ubuntu2.3
https://launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.4
https://launchpad.net/ubuntu/+source/squid3/3.5.12-1ubuntu7.9