#nginx

### Summary When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates the RFC because in the origin-form the URL should only contain the absolute path and the query. When this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control restrictions. ### Details For example, we have this Nginx configuration: ``` location /admin { deny all; return 403; } ``` This can be bypassed when the attacker is requesting to /#/../admin This won’t be vulnerable if the backend server follows the RFC and ignores any characters after the fragment. However, if Nginx is chained with another reverse proxy which automatically URL encode the character # (Traefik) the URL will become /%23/../admin And allow the attacker to completely bypass the Access Restriction from the Nginx Front-End proxy. Here is a diagram to summarize the attack: ![i...

Traefik is an open source HTTP reverse proxy and load balancer. When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates RFC 7230 because in the origin-form the URL should only contain the absolute path and the query. When this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control restrictions. This vulnerability has been addressed in versions 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

kkFileView v4.3.0 is vulnerable to Incorrect Access Control.

nexkey is a microblogging platform. Insufficient validation of ActivityPub requests received in inbox could allow any user to impersonate another user in certain circumstances. This issue has been patched in version 12.122.2.

HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote attackers to obtain sensitive information or have unspecified other impact upon misinterpretation of a path_end rule, such as routing index.html#.png to a static server.

Cross Site Scripting vulnerability in Grocy v.4.0.3 allows a local attacker to execute arbitrary code and obtain sensitive information via the equipment description component within /equipment/ component.

BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.1 has a path traversal vulnerability that allows an attacker with a valid starting folder path, to traverse and read other files without authentication, assuming the files have certain extensions (txt, swf, svg, png). In version 2.6.0-beta.1, input validation was added on the parameters being passed and dangerous characters are stripped. There are no known workarounds.

# Description The laters version of Kimai is found to be vulnerable to a critical Server-Side Template Injection (SSTI) which can be escalated to Remote Code Execution (RCE). The vulnerability arises when a malicious user uploads a specially crafted Twig file, exploiting the software's PDF and HTML rendering functionalities. Snippet of Vulnerable Code: ```php public function render(array $timesheets, TimesheetQuery $query): Response { ... $content = $this->twig->render($this->getTemplate(), array_merge([ 'entries' => $timesheets, 'query' => $query, ... ], $this->getOptions($query))); ... $content = $this->converter->convertToPdf($content, $pdfOptions); ... return $this->createPdfResponse($content, $context); } ``` The vulnerability is triggered when the software attempts to render invoices, allowing the attacker to execute arbitrary code on the server. In below, you can find the docker-compose file was used for this testing: ``...

Three unpatched high-severity security flaws have been disclosed in the NGINX Ingress controller for Kubernetes that could be weaponized by a threat actor to steal secret credentials from the cluster. The vulnerabilities are as follows -  CVE-2022-4886 (CVSS score: 8.8) - Ingress-nginx path sanitization can be bypassed to obtain the credentials of the ingress-nginx controller CVE-2023-5043 (

VinChin Backup & Recovery v5.0.*, v6.0.*, v6.7.*, and v7.0.* was discovered to contain hardcoded credentials.