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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3229 USN-5090-1 and USN-5090-2: Apache HTTP Server vulnerabilities 28 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Apache HTTP Server Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated 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-2021.3148 ESB-2021.2985 ESB-2021.2978 Original Bulletin: https://ubuntu.com/security/notices/USN-5090-1 https://ubuntu.com/security/notices/USN-5090-2 Comment: This bulletin contains two (2) Ubuntu security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- USN-5090-1: Apache HTTP Server vulnerabilities 27 September 2021 Several security issues were fixed in Apache HTTP Server. Releases o Ubuntu 21.04 o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS Packages o apache2 - Apache HTTP server Details James Kettle discovered that the Apache HTTP Server HTTP/2 module incorrectly handled certain crafted methods. A remote attacker could possibly use this issue to perform request splitting or cache poisoning attacks. ( CVE-2021-33193 ) It was discovered that the Apache HTTP Server incorrectly handled certain malformed requests. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. ( CVE-2021-34798 ) Li Zhi Xin discovered that the Apache mod_proxy_uwsgi module incorrectly handled certain request uri-paths. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS and Ubuntu 21.04. ( CVE-2021-36160 ) It was discovered that the Apache HTTP Server incorrectly handled escaping quotes. If the server was configured with third-party modules, a remote attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code. ( CVE-2021-39275 ) It was discovered that the Apache mod_proxy module incorrectly handled certain request uri-paths. A remote attacker could possibly use this issue to cause the server to forward requests to arbitrary origin servers. ( CVE-2021-40438 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04 o apache2 - 2.4.46-4ubuntu1.2 o apache2-bin - 2.4.46-4ubuntu1.2 Ubuntu 20.04 o apache2 - 2.4.41-4ubuntu3.5 o apache2-bin - 2.4.41-4ubuntu3.5 Ubuntu 18.04 o apache2 - 2.4.29-1ubuntu4.17 o apache2-bin - 2.4.29-1ubuntu4.17 In general, a standard system update will make all the necessary changes. References o CVE-2021-34798 o CVE-2021-33193 o CVE-2021-40438 o CVE-2021-39275 o CVE-2021-36160 Related notices o USN-5090-2 : apache2-suexec-pristine, apache2-mpm-itk, apache2-utils, apache2-mpm-prefork, libapache2-mod-proxy-html, apache2-bin, apache2-doc, apache2, apache2-data, apache2-mpm-event, apache2-suexec-custom, apache2-mpm-worker, apache2.2-bin, apache2-dev, apache2-suexec, libapache2-mod-macro - -------------------------------------------------------------------------------- USN-5090-2: Apache HTTP Server vulnerabilities 27 September 2021 Several security issues were fixed in Apache HTTP Server. Releases o Ubuntu 16.04 ESM o Ubuntu 14.04 ESM Packages o apache2 - Apache HTTP server Details USN-5090-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. Original advisory details: It was discovered that the Apache HTTP Server incorrectly handled certain malformed requests. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. ( CVE-2021-34798 ) It was discovered that the Apache HTTP Server incorrectly handled escaping quotes. If the server was configured with third-party modules, a remote attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code. ( CVE-2021-39275 ) It was discovered that the Apache mod_proxy module incorrectly handled certain request uri-paths. A remote attacker could possibly use this issue to cause the server to forward requests to arbitrary origin servers. ( CVE-2021-40438 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 o apache2 - 2.4.18-2ubuntu3.17+esm2 Available with UA Infra or UA Desktop o apache2-bin - 2.4.18-2ubuntu3.17+esm2 Available with UA Infra or UA Desktop Ubuntu 14.04 o apache2 - 2.4.7-1ubuntu4.22+esm2 Available with UA Infra or UA Desktop o apache2-bin - 2.4.7-1ubuntu4.22+esm2 Available with UA Infra or UA Desktop In general, a standard system update will make all the necessary changes. References o CVE-2021-39275 o CVE-2021-40438 o CVE-2021-34798 Related notices o USN-5090-1 : apache2-dev, apache2-suexec-custom, apache2-doc, apache2, apache2-data, apache2-utils, apache2-ssl-dev, apache2-bin, libapache2-mod-md, libapache2-mod-proxy-uwsgi, apache2-suexec-pristine - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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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