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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1239 Squid Proxy Cache Security Update Advisory 20 April 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Squid Publisher: Squid Operating System: UNIX variants (UNIX, Linux, OSX) BSD variants Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-1172 Original Bulletin: http://www.squid-cache.org/Advisories/SQUID-2018_3.txt - --------------------------BEGIN INCLUDED TEXT-------------------- __________________________________________________________________ Squid Proxy Cache Security Update Advisory SQUID-2018:3 __________________________________________________________________ Advisory ID: SQUID-2018:3 Date: April 18, 2018 Summary: Denial of Service issue in ESI Response processing. Affected versions: Squid 3.1.12.2 -> 3.1.23 Squid 3.2.0.8 -> 3.2.14 Squid 3.3 -> 4.0.12 Fixed in version: Squid 4.0.13 __________________________________________________________________ http://www.squid-cache.org/Advisories/SQUID-2018_3.txt http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1172 __________________________________________________________________ Problem Description: Due to incorrect pointer handling Squid is vulnerable to denial of service attack when processing ESI responses. __________________________________________________________________ Severity: This problem allows a remote server delivering ESI responses to trigger a denial of service for all clients accessing the Squid service. This problem is limited to Squid operating as reverse proxy. __________________________________________________________________ Updated Packages: This bug is fixed by Squid version 4.0.13. In addition, patches addressing this problem for the stable releases can be found in our patch archives: Squid 3.5: <http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_3.patch> If you are using a prepackaged version of Squid then please refer to the package vendor for availability information on updated packages. __________________________________________________________________ Determining if your version is vulnerable: All Squid-2.x and older are not vulnerable. All Squid-3.0 and older version are not vulnerable. All Squid built with --disable-esi are not vulnerable. All Squid-3.x versions up to and including 3.4.14 built with --disable-ssl are not vulnerable. All Squid-3.x versions up to and including 3.4.14 built without --enable-ssl are not vulnerable. All Squid-3.x versions up to and including 3.5.27 built without --enable-esi are not vulnerable. All Squid-3.1.12.2 and later versions up to and including Squid-3.1.23 built with --enable-esi and--enable-ssl, and being used for reverse-proxy are vulnerable. All Squid-3.2.0.8 and later versions up to and including Squid-3.2.14 built with --enable-esi and --enable-ssl, and being used for reverse-proxy are vulnerable. All Squid-3.3 and later versions up to and including Squid-3.3.14 built with --enable-esi and --enable-ssl, and being used for reverse-proxy are vulnerable. All Squid-3.4 and later versions up to and including Squid-3.4.14 built with --enable-esi and --enable-ssl, and being used for reverse-proxy are vulnerable. All Squid-3.5 versions up to and including 3.5.27 built without --with-openssl are not vulnerable. All Squid-3.5 and later versions up to and including 3.5.27 built with --enable-esi and --with-openssl, and being used for reverse-proxy are vulnerable. All Squid-4 versions up to and including 4.0.12 built without --with-openssl are not vulnerable. All Squid-4 versions up to and including 4.0.12 built with --with-openssl and being used for reverse-proxy are vulnerable. __________________________________________________________________ Workarounds: Either; Build Squid with --disable-esi Or, Build Squid-3.1 to 3.4.14 or later with "--disable-ssl" Or, Build Squid-3.5 or later with "--without-openssl" __________________________________________________________________ Contact details for the Squid project: For installation / upgrade support on binary packaged versions of Squid: Your first point of contact should be your binary package vendor. If your install and build Squid from the original Squid sources then the squid-users@lists.squid-cache.org mailing list is your primary support point. For subscription details see <http://www.squid-cache.org/Support/mailing-lists.html>. For reporting of non-security bugs in the latest STABLE release the squid bugzilla database should be used <http://bugs.squid-cache.org/>. For reporting of security sensitive bugs send an email to the squid-bugs@lists.squid-cache.org mailing list. It's a closed list (though anyone can post) and security related bug reports are treated in confidence until the impact has been established. __________________________________________________________________ Credits: This vulnerability was discovered by Michael Marshall of Trend Micro working with Trend Micro's Zero Day Initiative. Fixed by Christos Tsantilas on behalf of Measurement Factory. __________________________________________________________________ Revision history: 2018-04-16 18:20:15 UTC Initial Report 2018-04-16 22:02:25 UTC Patches Released 2018-04-18 12:28:00 UTC Advisory Released __________________________________________________________________ END - --------------------------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: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane 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. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWtmNfox+lLeg9Ub1AQgYmg//avJnX3Wad5wMIpWNbOOd+tZoGrK1L9g2 BY+u1UdfFMSWW95IkBkYFPO4tEcjjyf1/rKY/vTeehuT/cC38V/U8oXgaUo0ot09 G3H0vzcp6iaAOhqkzqgDcN086sDVypuAub8R0xbN4qK+aAB37KtgyX8UK4IaOKv9 hcUzRK67MZYsWvP5ypm03A7ZF/fxVS1OVP9o1HOwAMh6zYQKX6Q18oBxaOmJKvF0 kZYmFHgi31BQ5AAxoOgP2I3EbwJfuyCt3r4pW8ir/Iwkp5Hi2WO1ZAiwzVupEFsw dlFxfpRywRTfr8/nE+vBUsOP5nvCcCbB95NoXpj99O4VOckOsvas0P85Vpk0OKD1 F4D6wYM9b4cudJPU0qVh6sRCkcArqZsquPjhXtezyvuCU9+dn1xMhkUfzdHe5kJ1 22bFHWuWzC3qAl9PQEYsYctxnm1LvTUtKmILwp4ujDyhLJYmI5K4BYTchOxeic4s lxw9aFS1QkF+XqSjkmfQ+vwoYIxJ6yCfMl9kU30lxZ7OT0LzpTHaFNA020f0yhwU OLlAPiMd9zHYhqtF+GiCrb/VK5okoOsFmVtpCI1dHyGD9OYBBqXYuBlWGg1Mqol5 48n+wM1JjcmJwMEgD8VKHfrR1OrW9pTPx8xeJTylHmgn2Bs5LUpT3cXKjeJCcV9s smjUC9bGuAM= =hCwB -----END PGP SIGNATURE-----