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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.2233 Squid Proxy Cache Security Update Advisory SQUID-2020:7 30 June 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Squid Publisher: Squid Operating System: UNIX variants (UNIX, Linux, OSX) Impact/Access: Denial of Service -- Existing Account Provide Misleading Information -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-15049 Original Bulletin: https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5 - --------------------------BEGIN INCLUDED TEXT-------------------- __________________________________________________________________ Squid Proxy Cache Security Update Advisory SQUID-2020:7 __________________________________________________________________ Advisory ID: | SQUID-2020:7 Date: | June 26, 2020 Summary: | Cache Poisoning Issue | in HTTP Request processing. Affected versions: | Squid 2.x -> 2.7.STABLE9 | Squid 3.x -> 3.5.28 | Squid 4.x -> 4.11 | Squid 5.x -> 5.0.2 Fixed in version: | Squid 4.12 and 5.0.3 __________________________________________________________________ <https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5> <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15049> __________________________________________________________________ Problem Description: Due to incorrect input validation Squid is vulnerable to a Request Smuggling and Poisoning attack against the HTTP cache. __________________________________________________________________ Severity: This problem allows a trusted client to perform request smuggling and poison the HTTP cache contents with crafted HTTP(S) request messages. This attack requires an upstream server to participate in the smuggling and generate the poison response sequence. Most popular server software are not vulnerable to participation in this attack. CVSS Score of 9.3 <https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C/CR:H/IR:H/AR:H/MAV:N/MAC:L/MPR:L/MUI:N/MS:C/MC:H/MI:H/MA:H&version=3.1> __________________________________________________________________ Updated Packages: This bug is fixed by Squid versions 4.12 and 5.0.3. In addition, patches addressing this problem for the stable releases can be found in our patch archives: Squid 4: <http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patch> Squid 5: <http://www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad0094647ea57a6eb8d.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-3.x up to and including 3.5.28 are vulnerable. All Squid-4.x up to and including 4.11 are vulnerable. Squid-5.0.1 and 5.0.2 are vulnerable. __________________________________________________________________ Workaround: There is no workaround for this vulnerability. __________________________________________________________________ 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 you 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 Alex Rousskov of The Measurement Factory. Independent discovery and replication reported by Amit Klein of Safebreach. Fixed by Alex Rousskov of The Measurement Factory. __________________________________________________________________ Revision history: 2016-09-06 02:45:20 UTC Initial Report 2020-05-11 12:41:17 UTC Replication Reported 2020-05-13 14:05:00 UTC Patch Released 2020-06-25 11:15:10 UTC CVE Allocated - --------------------------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). 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