Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4560 USN-4213-1: Squid vulnerabilities 5 December 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Squid Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-18679 CVE-2019-18678 CVE-2019-18677 CVE-2019-18676 CVE-2019-12854 CVE-2019-12526 CVE-2019-12523 Reference: ESB-2019.4232 ESB-2019.2609 Original Bulletin: https://usn.ubuntu.com/4213-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4213-1: Squid vulnerabilities 4 December 2019 squid, squid3 vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 19.10 o Ubuntu 19.04 o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Summary Several security issues were fixed in Squid. Software Description o squid - Web proxy cache server o 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) RA(C)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 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades . In general, a standard system update will make all the necessary changes. References o CVE-2019-12523 o CVE-2019-12526 o CVE-2019-12854 o CVE-2019-18676 o CVE-2019-18677 o CVE-2019-18678 o CVE-2019-18679 - --------------------------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 iQIVAwUBXeh57maOgq3Tt24GAQh1MxAAx2JTD/OTiagyfQz/0W5NC+mHS0SeufoN vts+UdThWZ68pa8E26kdXVGCWRtGzABNQwc7yLlxyGqagbhT2cQfi7JIu1DXdrn/ Rf63BktNX08v7h8i8AI/Y2FYdGOapH1EPTWfqdzPwJH/V4SZAYtlSK5gIfI9WqqJ e1HZDOilad7XvKTTU34E1B+pAbDvG3o3U9uPvm89B6M2nxAlps7aWoowbFEdjzNB 9VgP4H5Hx7U7igRkjhBM1mpwesS009SKCeupBD02JVSn7Dp1XgjewHc/o9Q2I9JO BXc61X5NjLfLcZqHFPKZTRz4NaEiE6chTLla2elqip3ECI2s+uzHFNLJ545/JbcS Es8kO2cjS1A0+3/4dgRGfHa5L1IlMHgvJ5KE0xhCphyMKoZzdkp01bojf+orWhHM 3SPQ4IdkMe8h0ZzSlFyiH5hZSUFIJIR98NRw6lesljY3iQs+RyhhAMNydBImWt73 v3DW9zaYlCAQczP/9/TWSI7hzYVgfWDAGyYUSbQcaZ/H2ZlYNsGXFSiHmKwbtDVj W8FDgaJ4qdX2Uvqtxo/x7656DJe0dZf5znEVFTNhrS2nXL87/aMGV2C7AXvnge2k /gvzk1BDQxNRswxluMPcqj7ulFmWAcaVl7e/nWQkqnAnUVQf9/DcT6tz8Nsf/aih SJ3O6HLFxIY= =ng8D -----END PGP SIGNATURE-----