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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3287 Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 (CVE-2021-41773) 6 October 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Apache HTTP Server Publisher: Apache Software Foundation Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Access Privileged Data -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-41773 Original Bulletin: https://httpd.apache.org/security/vulnerabilities_24.html - --------------------------BEGIN INCLUDED TEXT-------------------- Severity: important Description: A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the expected document root. If files outside of the document root are not protected by "require all denied" these requests can succeed. Additionally this flaw could leak the source of interpreted files like CGI scripts. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. Acknowledgements: This issue was reported by Ash Daulton along with the cPanel Security Team Reported to security team 2021-09-29 fixed by r1893775 in 2.4.50 2021-10-01 Update 2.4.50 released 2021-10-04 Affects 2.4.49 Fixed in Apache HTTP Server 2.4.50 - --------------------------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 iQIVAwUBYVzdguNLKJtyKPYoAQiIzhAApqi2jzY0Ohezbp7nD6mCGFZYf4kvmiWx DK6FO2HDGF5at6VK0/2m0O7BPshHjYDEQzjMZyMWYxILmyQoMPcpFt7KK/yWmenl c+YsHBnrMJV5hx4gLL/mOxUvZhxIzyWiE7BIfFgI5Ufag/CDYQugtAIpV5K0woRl gI75KP3D25vuRhMEhw9VTuREnHO7bXnwJVm8SHSUvhZrQrB9vgRE1m9JDVofMtV/ 5ta+jefGpuf7WWhNxPw+s41tN5XzdO9KpeBRG/VSVLiQpzXeGcRVPj+z2R+gljQk JB21RF78HJigc49uCfE/9yCf8CZtgHR4C50y57ASZ4jesSx9ETZpp+Nt6CMMlY+d 0kH/bA0wWYlkx9haINwseQF1OGOGowJRWoeE4rVlKs9MMqCCKP/Ie+dbQ7K8oGcP k2Nyb7ITzU+AFn/U9TxQACqZrZdKTQaLMG8H4Gq7U2cMMu/DfUNUz3lqbhJzw/s1 7cd/QPs4iXlOkI94PJRMS4oc4LmALUNUIEfhuCvQlFlEGA7YYVw2g0gXgmTmElU2 O/leEczXcQuJoifn0gs4RzZKM764EtjEtEu3WXvyGa8q+o6bPaTk8Vz2XHDqzdL2 FXJ7WMHvLDtqOAwXVj8z2R8lL4HuHOxz8WD8q/jH5SUA8+pVd9G3Ag2gP5DklWDa Db1FEYtFd7Q= =lwhP -----END PGP SIGNATURE-----