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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3441 USN-4571-1: rack-cors vulnerability 6 October 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: rack-cors Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-18978 Reference: ESB-2020.3428 ESB-2020.0444 ESB-2020.0376 Original Bulletin: https://usn.ubuntu.com/4571-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4571-1: rack-cors vulnerability 05 October 2020 rack-cors would allow unintended access to files over the network. Releases o Ubuntu 16.04 LTS Packages o ruby-rack-cors - provides support for Cross-Origin Resource Sharing (CORS) for Rack compatible web applications Details It was discovered that rack-cors did not properly handle relative file paths. An attacker could use this vulnerability to access arbitrary files. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 o ruby-rack-cors - 0.4.0-1+deb9u2build0.16.04.1 In general, a standard system update will make all the necessary changes. References o CVE-2019-18978 - --------------------------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 iQIVAwUBX3uuP+NLKJtyKPYoAQg8jhAAgziUIYTPvhEk2xvHIwdIWGHr3AwKgr5n OSB3HHAqpzILpgZH33AmG2kyD4a4AFK+1SYOSFcMI2ur+4i5XLSvaCnhPRsX/bDu GanQndkwmysN+S1fnxO7VaqnisOiD/uNnb+FXrgSAsr5oFuWKm+q/UJX4QCAFaqb VCQ/ryga0AVQrH+T3nkOBLU7YcTc41dGH+PdpaaMeIDxUTABcomwmGDpeKXes+PD VeKA4WpqgJh2nldmQWxk1Z7qOgfuhoE1c6dAPehM97LE6iqkqAmbKKr/dyTqJ6gw nHM/XXNMg4Fzj3TmiF81AcD0WaDZMAGhSfulyBfXpeDshEKt2W2hyFe8HfAopKg5 Pl9+DJf9bPB0JfO/67Nu7v06jcOWvkcY+c+Ys6dQWp5GR/s5bbh9dK4tiM5RC2rl dtjInjpyT15G2yMJyCw4WiAQFmHQJSBjpxesjiy7mhveOIe5eiHazT6H9Sn00ZEH XiD1gyflm1i2GZI9qbYyHWsIDqmXV29Zo5Zs0iMlHPDzcTFqLtNpBxMJQp7pDnHt Oye6Msc/jYQaTaUba3dJzg5zwVAWdPd73AHOpX6L8BLzJ2/K+61dpdMAjfDvA+el XleBNoEaxLxALRpzs/Y+pcVMJtekOKbIIxGoCLdHAhn9MkRgxJeH7GBSeiv8iQXL ylOxPEH6CVQ= =epAc -----END PGP SIGNATURE-----