{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"critical"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2021-29492","title":"Title"},{"category":"description","text":"Envoy is a cloud-native edge/middle/service proxy. Envoy does not decode escaped slash sequences `%2F` and `%5C` in HTTP URL paths in versions 1.18.2 and before. A remote attacker may craft a path with escaped slashes, e.g. `/something%2F..%2Fadmin`, to bypass access control, e.g. a block on `/admin`. A backend server could then decode slash sequences and normalize path and provide an attacker access beyond the scope provided for by the access control policy. ### Impact Escalation of Privileges when using RBAC or JWT filters with enforcement based on URL path. Users with back end servers that interpret `%2F` and `/` and `%5C` and `\\` interchangeably are impacted. ### Attack Vector URL paths containing escaped slash characters delivered by untrusted client. Patches in versions 1.18.3, 1.17.3, 1.16.4, 1.15.5 contain new path normalization option to decode escaped slash characters. As a workaround, if back end servers treat `%2F` and `/` and `%5C` and `\\` interchangeably and a URL path based access control is configured, one may reconfigure the back end server to not treat `%2F` and `/` and `%5C` and `\\` interchangeably.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2021-29492","url":"https://www.suse.com/security/cve/CVE-2021-29492"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1185960 for CVE-2021-29492","url":"https://bugzilla.suse.com/1185960"}],"title":"SUSE CVE CVE-2021-29492","tracking":{"current_release_date":"2025-02-17T05:33:42Z","generator":{"date":"2023-02-15T03:43:31Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2021-29492","initial_release_date":"2023-02-15T03:43:31Z","revision_history":[{"date":"2023-02-15T03:43:31Z","number":"2","summary":"Current version"},{"date":"2025-01-01T04:36:00Z","number":"3","summary":"Current version"},{"date":"2025-02-15T05:10:21Z","number":"4","summary":"Current version"},{"date":"2025-02-17T05:33:42Z","number":"5","summary":"Current version"}],"status":"interim","version":"5"}}}