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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3148 Apache HTTP Server 2.4 vulnerabilities 20 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Apache HTTP Server Publisher: Apache Software Foundation Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-40438 CVE-2021-39275 CVE-2021-36160 CVE-2021-34798 CVE-2021-33193 Reference: ESB-2021.2985 ESB-2021.2978 Original Bulletin: https://httpd.apache.org/security/vulnerabilities_24.html - --------------------------BEGIN INCLUDED TEXT-------------------- Apache HTTP Server 2.4 vulnerabilities The initial GA release, Apache httpd 2.4.1, includes fixes for all vulnerabilities which have been resolved in Apache httpd 2.2.22 and all older releases. Consult the Apache httpd 2.2 vulnerabilities list for more information. Fixed in Apache HTTP Server 2.4.49 moderate: Request splitting via HTTP/2 method injection and mod_proxy ( CVE-2021-33193) A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48. Acknowledgements: Reported by James Kettle of PortSwigger Reported to security team 2021-05-11 Issue public 2021-08-06 Update 2.4.49 released 2021-09-16 Affects <=2.4.48, !<2.4.17 moderate: NULL pointer dereference in httpd core (CVE-2021-34798) Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier. Acknowledgements: The issue was discovered by the Apache HTTP security team Update 2.4.49 released 2021-09-16 Affects <=2.4.48 moderate: mod_proxy_uwsgi out of bound read (CVE-2021-36160) A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash (DoS). This issue affects Apache HTTP Server versions 2.4.30 to 2.4.48 (inclusive). Acknowledgements: LI ZHI XIN from NSFocus Security Team Reported to security team 2021-04-26 Update 2.4.49 release 2021-09-16 Affects <=2.4.48, !<2.4.30 low: ap_escape_quotes buffer overflow (CVE-2021-39275) ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier. Acknowledgements: ClusterFuzz Update 2.4.49 released 2021-09-16 Affects <=2.4.48 high: mod_proxy SSRF (CVE-2021-40438) A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier. Acknowledgements: The issue was discovered by the Apache HTTP security team while analysing CVE-2021-36160 Update 2.4.49 released 2021-09-16 Affects <=2.4.48 - --------------------------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. 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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 iQIVAwUBYUfZN+NLKJtyKPYoAQgo+Q//WWT7MSMINPJNBGy6ySQfgX4qyoLcONZZ RW6ZK6CjdSc5gXAShmL5w9FBN3WV6/54864YCqQTkL2wtJ9RylbM1vaMH1rIEgu5 YXaujv2DJDLG4zOz9VkZW+Hv+jSVnghCDVEChbLzDpGgbpbVtUeg8NOtZp2ozLTh nziD0nBo7xY+N5lc3vtH/qhpWVag+foPS8xBSKS9AFOI+E7z4podiJWRBfMg+sbh KlQjSgUp6AfiV1c0cF6XCVoHFygHIg1ari1INYCarJDSNknd2CLKfndgRkYgqphP ptvCOSF+gGHO0tIYzAXdnEHgCSRYj4wY9sUu1ihnSvy7IgFKYR2+WtXeqr4ZwGMw vD6BZgxE55hyrpP5nc2fE2Mixc9vsLBEaQCJjaQNZnez6O2icQf6CLwQubqZCLC3 WJ9ZFxclbiVWGo3KNNFugSSNw9FN71ppyfb510vJGzz8eVU+UPH52Kmh42MbQwGc EFDabjp/XoMQstc1DtB8iQZ2RaG5C/INPDCiihJDWxCougOEtx+7TK4chlkiCcU5 ihkLihPDIR8+0O8HBb+Fi/tbSl7acKJpfaF7AmYn4168Y5k/YlFsdXVcJTnnZXDS yz3sef4Cvp63qYzCS6XpOZnEBkm3joiS5yrdiHp/GcgIqL0d4Hl/0ZeNleEDM0nF 8hRjQHiyVe8= =hbLM -----END PGP SIGNATURE-----