Hash: SHA256

             AUSCERT External Security Bulletin Redistribution

                          Squid 4.8 is available
                               15 July 2019


        AusCERT Security Bulletin Summary

Product:           Squid HTTP Proxy
Publisher:         Squid HTTP Proxy Team
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service               -- Remote/Unauthenticated      
                   Execute Arbitrary Code/Commands -- Remote/Unauthenticated      
                   Cross-site Scripting            -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-13345 CVE-2019-12854 CVE-2019-12529
                   CVE-2019-12527 CVE-2019-12525 

Reference:         ESB-2019.2479

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

The Squid HTTP Proxy team is very pleased to announce the availability
of the Squid-4.8 release!

This release is a security release resolving several issues found in
the prior Squid releases.

The major changes to be aware of:

 * SQUID-2019:1 Denial of Service issue in cachemgr.cgi

This issue security vulnerability is in the cachemgr.cgi tool (not the
squid proxy). With certain requests the cachemgr.cgi may access
unallocated memory.

On systems with memory access protections this can result in the CGI
process terminating unexpectedly. Resulting in a denial of service for
all clients using it.

See the advisory for more details:

 * SQUID-2019:2 Denial of Service in HTTP Basic Authentication

The Basic authentication credentials decoder may access memory outside
the decode buffer.

On systems with memory access protections this can result in the Squid
process being terminated unexpectedly. Resulting in a denial of service
for all clients using the proxy.

See the advisory for more details:

 * SQUID-2019:3 Denial of Service in HTTP Digest Authentication

The HTTP Request header parser for Digest authentication may access
memory outside the allocated memory buffer.

On systems with memory access protections this can result in the Squid
process being terminated unexpectedly. Resulting in a denial of service
for all clients using the proxy.

See the advisory for more details:

 * SQUID-2019:5 Heap Overflow issue in HTTP Basic Authentication

This allows a malicious client to write a substantial amount of
arbitrary data to the heap. Potentially gaining ability to execute
arbitrary code.

On systems with memory access protections this can result in the Squid
process being terminated unexpectedly. Resulting in a denial of service
for all clients using the proxy.

This issue is limited to traffic accessing the Squid Cache Manager
reports or using the FTP protocol gateway.

See the advisory for more details:

 * SQUID-2019:6 Multiple Cross-Site Scripting issues in cachemgr.cgi

This allows a malicious server to embed URLs in its content such that
user credentials and other information can be extracted from a client or
administrator with access to the Squid cachemgr.cgi tool URL.

See the advisory for more details:

 * Regression: Fix tls-min-version= being ignored

Squid-4 has been allowing negotiation of TLS versions prohibited by this
option. Also, for some configurations the tls-options= also does not
work as intended. This release fixes both these options to work as

 * Add the NO_TLSv1_3 option to available tls-options values

This release brings the ability to prohibit OpenSSL from negotiating
TLS/1.3 with clients, peers or servers.

 * Bug 4953: to_localhost does not include ::

Some OS treat unspecified destination address as an implicit
localhost connection attempt. This was a well-known issue with IPv4
which was supposed to be prohibited with IPv6 traffic. However, once
again OS have appeared which treat IPv6 :: as an alias of localhost.

To make matters worse some domains return :: explicitly as their IP
address to DNS AAAA queries.

We have added ::/128 to the pre-defined to_localhost ACL. Any users of
that ACL not able to update are advised to add this to their squid.conf

  acl to_localhost dst ::/128

 * Bug 4889: Ignore ECONNABORTED in accept(2)

This shows up as a large number of hung socket connections and/or
cache.log entries like:
  oldAccept ...: (53) Software caused connection abort

It primarily occurs on OpenBSD 6.5 and later, but may be seen on other
systems as well.

  All users of Squid are urged to upgrade as soon as possible.

See the ChangeLog for the full list of changes in this and earlier

Please refer to the release notes at
when you are ready to make the switch to Squid-4

This new release can be downloaded from our HTTP or FTP servers


or the mirrors. For a list of mirror sites see


If you encounter any issues with this release please file a bug report.

Amos Jeffries

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
Comment: http://www.auscert.org.au/render.html?it=1967