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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.0328 Squid Proxy Cache Security Update Advisory SQUID-2014:1 12 March 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Squid Publisher: Squid Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2014-0128 Original Bulletin: http://www.squid-cache.org/Advisories/SQUID-2014_1.txt - --------------------------BEGIN INCLUDED TEXT-------------------- __________________________________________________________________ Squid Proxy Cache Security Update Advisory SQUID-2014:1 __________________________________________________________________ Advisory ID: SQUID-2014:1 Date: March 09, 2014 Summary: Denial of Service in SSL-Bump Affected versions: Squid 3.1 -> 3.3.11, Squid 3.4 -> 3.4.3 Fixed in version: Squid 3.3.12, 3.4.4 __________________________________________________________________ http://www.squid-cache.org/Advisories/SQUID-2014_1.txt http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0128 __________________________________________________________________ Problem Description: Due to incorrect state management Squid is vulnerable to a denial of service attack when processing certain HTTPS requests. __________________________________________________________________ Severity: This problem allows any client who can generate HTTPS requests to perform a denial of service attack on the Squid service. There are popular client software implementations which generate HTTPS requests and triggering this vulnerability during their normal activities. __________________________________________________________________ Updated Packages: This bug is fixed by Squid versions 3.3.12 and 3.4.4. In addition, patches addressing this problem can be found in our patch archives. Squid 3.3: <http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12677.patch> Squid 3.4: <http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13104.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 versions without SSL-Bump feature configured are not vulnerable. All Squid-3.0 and older versions, including Squid-2 are not vulnerable. All unpatched Squid-3.1 versions are vulnerable. All unpatched Squid-3.2 versions are vulnerable. All unpatched Squid-3.3 versions up to and including 3.3.11 are vulnerable. All unpatched Squid-3.4 versions up to and including 3.4.3 are vulnerable. __________________________________________________________________ Workarounds: Either Disable SSL-bump for clients affected by adding "ssl_bump none" rule(s) at the top of the ssl_bump configuration directives. Or Disable SSL-bump featrue completely by removing ssl-bump option from all http_port and/or https_port configuration directives. Or Use TCP_RESET instead of all Squid-generated error pages. Note that this is only a partial workaround as some error pages cannot be overridden. __________________________________________________________________ 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@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@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: The vulnerability was reported by Mathias Fischer and Fabian Hugelshofer from Open Systems AG. Fixes by Alex Rousskov from The Measurement Factory. __________________________________________________________________ Revision history: 2014-02-21 16:04 GMT Initial Report 2014-02-22 23:51 GMT Patch Provided 2014-03-09 00:14 GMT Packages 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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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 iQIVAwUBUx/m4RLndAQH1ShLAQLFbQ/+LpJq2x8lZvwuvonHeCG1V+Hcu0RtdAYQ u1GjLKOsMI6RWzOJLfbKqlldSeXDHYfvUGSTrOQRJNIu9SUJRwVYFrsSBwJ0frwW FyrhUG5UbUtDM4/VI6l9TW+xSWrL/sOKSzQHuvmuG0XpphaurdXglMa1L0ebkFDp HtX05V/wxcO+r7d27d4KkxdJFuwYch7uWzKJriagaD+qW6gs4D+kdAwxi2tQUyu/ xjuRaKfGZPXqrv3xTGZuFy3rNCpsGKoHP44VRisSmrqYb6qIm7s0panpBJ/275K1 lJ36CAs9o3uO8NpYkOFUyFBnya68t6y48v9708/Vd6XhsKVKf+5fGL61g9QufQWc 0KmdweySyq2dzaAH+B7OBCzmf5nsK9C5AVkixyYll1rEzZfcJqE6g7qeBxuvJ+B7 sdFaPI5froQ8B0Bf8Wug2TaGDOB6w0Qiu4YBfncLJTCyxv9R6Z5GP5rH6RAWLZqH C1iXN2F6wPTwp2byVpEk+QNOxgE50kWqg3GQuwiYFLMMf5kwtAKOJswyzWj/6qI1 WY9fPQM/FbTiDQ6bAb+NzhE3bVf6xB0SF999FOgjFu0PqYriu9hM1I/IIkjGWiIg 6rj16P24zY6lvqvc8n82GyxC8ykiSuKpBGRqXJNE3g49GPm4RMmUAxNFxJEofT4J MAvsUV5A6BA= =tCnl -----END PGP SIGNATURE-----