#dos

Red Hat Security Advisory 2024-0776-03 - An update for jenkins and jenkins-2-plugins is now available for OpenShift Developer Tools and Services for OCP 4.13. Issues addressed include bypass, code execution, cross site scripting, and denial of service vulnerabilities.

# Microsoft Security Advisory CVE-2024-21386: .NET Denial of Service Vulnerability ## <a name="executive-summary"></a>Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET 6.0, ASP.NET 7.0 and, ASP.NET 8.0 . This advisory also provides guidance on what developers can do to update their applications to address this vulnerability. A vulnerability exists in ASP.NET applications using SignalR where a malicious client can result in a denial-of-service. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/295 ### <a name="mitigation-factors"></a>Mitigation factors Microsoft has not identified any mitigating factors for this vulnerability. ## <a name="affected-software"></a>Affected software * Any .NET 6.0 application running on .NET 6.0.26 or earlier. * Any .NET 7.0 application running on .NET 7.0.15 or earlier. * Any .NET 8.0 application running on .NET 8.0.1 or ...

Although considered of moderate risk, one of the vulnerabilities is being actively exploited in the wild — CVE-2024-21351, a security feature bypass vulnerability in Windows SmartScreen.

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-g74q-5xw3-j7q9. This link is maintained to preserve external references. ## Original Description .NET Denial of Service Vulnerability

**The following mitigating factors might be helpful in your situation:** Only .NET services running on non-Windows platforms are affected by this vulnerability. If your web server is running on Windows, an attacker cannot use this DoS vector to bring down your web server.

**According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?** Successful exploitation of this vulnerability could allow a Hyper-V guest to affect the functionality of the Hyper-V host.

**According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an attacker to take additional actions prior to exploitation to prepare the target environment.

The Comment module allows users to reply to comments. In certain cases, an attacker could make comment reply requests that would trigger a denial of service (DOS). Sites that do not use the Comment module are not affected.

### Summary When using form data, `python-multipart` uses a Regular Expression to parse the HTTP `Content-Type` header, including options. An attacker could send a custom-made `Content-Type` option that is very difficult for the RegEx to process, consuming CPU resources and stalling indefinitely (minutes or more) while holding the main event loop. This means that process can't handle any more requests. This can create a ReDoS (Regular expression Denial of Service): https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS This only applies when the app uses form data, parsed with `python-multipart`. ### Details A regular HTTP `Content-Type` header could look like: ``` Content-Type: text/html; charset=utf-8 ``` `python-multipart` parses the option with this RegEx: https://github.com/andrew-d/python-multipart/blob/d3d16dae4b061c34fe9d3c9081d9800c49fc1f7a/multipart/multipart.py#L72-L74 A custom option could be made and sent to the server to break it wit...

The [libgit2](https://github.com/libgit2/libgit2/) project fixed three security issues in the 1.7.2 release. These issues are: * The `git_revparse_single` function can potentially enter an infinite loop on a well-crafted input, potentially causing a Denial of Service. This function is exposed in the `git2` crate via the [`Repository::revparse_single`](https://docs.rs/git2/latest/git2/struct.Repository.html#method.revparse_single) method. * The `git_index_add` function may cause heap corruption and possibly lead to arbitrary code execution. This function is exposed in the `git2` crate via the [`Index::add`](https://docs.rs/git2/latest/git2/struct.Index.html#method.add) method. * The smart transport negotiation may experience an out-of-bounds read when a remote server did not advertise capabilities. The `libgit2-sys` crate bundles libgit2, or optionally links to a system libgit2 library. In either case, versions of the libgit2 library less than 1.7.2 are vulnerable. The 0.16.2 release ...