#dos

Use of default credentials vulnerability in MR-GM2 firmware Ver. 3.00.03 and earlier, and MR-GM3 (-D/-K/-S/-DK/-DKS/-M/-W) firmware Ver. 1.03.45 and earlier allows a network-adjacent unauthenticated attacker to intercept wireless LAN communication, when the affected product performs the communication without changing the pre-shared key from the factory-default configuration.

Microsoft today issued security updates for more than 100 newly-discovered vulnerabilities in its Windows operating system and related software, including four flaws that are already being exploited. In addition, Apple recently released emergency updates to quash a pair of zero-day bugs in iOS.

### Impact The MsQuic server will continue to leak memory until no more is available, resulting in a denial of service. ### Patches The following patch was made: - Fix Memory Leak from Multiple Decodes of TP - https://github.com/microsoft/msquic/commit/d364feeda0dd8b729eca6fef149c1ef98630f0cb ### Workarounds Beyond upgrading to the patched versions, there is no other workaround.

October's CVE update is here. Here's which security vulnerabilities to patch now to exorcise your Microsoft systems demons.

swift-nio-http2 is vulnerable to a denial-of-service vulnerability in which a malicious client can create and then reset a large number of HTTP/2 streams in a short period of time. This causes swift-nio-http2 to commit to a large amount of expensive work which it then throws away, including creating entirely new `Channel`s to serve the traffic. This can easily overwhelm an `EventLoop` and prevent it from making forward progress. swift-nio-http2 1.28 contains a remediation for this issue that applies reset counter using a sliding window. This constrains the number of stream resets that may occur in a given window of time. Clients violating this limit will have their connections torn down. This allows clients to continue to cancel streams for legitimate reasons, while constraining malicious actors.

### Impact A malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. ### Patches Server administrators are advised to upgrade to Synapse 1.94.0 or later. ### Workarounds Rooms with malicious server ACL events can be [purged and blocked](https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version) using the admin API. ### References https://github.com/matrix-org/synapse/pull/16360

### Impact The MsQuic server application or process will crash, resulting in a denial of service. ### Patches The following patch was made: - Don't Allow Version Negotiation Packets for Server Connections - https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343 ### Workarounds Beyond upgrading to the patched versions, there is no other workaround. You must upgrade or disable MsQuic functionality.

An integer overflow in `MetaDataBuilder.checkSize` allows for HTTP/2 HPACK header values to exceed their size limit. In `MetaDataBuilder.java`, the following code determines if a header name or value exceeds the size limit, and throws an exception if the limit is exceeded: ```java 291 public void checkSize(int length, boolean huffman) throws SessionException 292 { 293 // Apply a huffman fudge factor 294 if (huffman) 295 length = (length * 4) / 3; 296 if ((_size + length) > _maxSize) 297 throw new HpackException.SessionException("Header too large %d > %d", _size + length, _maxSize); 298 } ``` However, when length is very large and huffman is true, the multiplication by 4 in line 295 will overflow, and length will become negative. (_size+length) will now be negative, and the check on line 296 will not be triggered. Furthermore, `MetaDataBuilder.checkSize` allows for user-entered HPACK header value sizes to be negative, potentially leading to a very large buffer allocation later on w...

Ongoing Rapid Reset DDoS flood attacks exposed organizations need to patch CVE-2023-44487 immediately to head off crippling outages and business disruption.

DDoS for hire and live attacks hit both sides as cyber campaigns continue.