diff --git a/advisories/github-reviewed/2024/11/GHSA-xq3w-v528-46rv/GHSA-xq3w-v528-46rv.json b/advisories/github-reviewed/2024/11/GHSA-xq3w-v528-46rv/GHSA-xq3w-v528-46rv.json
index 2c6b378c5fdec..1cb6ff06fa380 100644
--- a/advisories/github-reviewed/2024/11/GHSA-xq3w-v528-46rv/GHSA-xq3w-v528-46rv.json
+++ b/advisories/github-reviewed/2024/11/GHSA-xq3w-v528-46rv/GHSA-xq3w-v528-46rv.json
@@ -1,7 +1,7 @@
{
"schema_version": "1.4.0",
"id": "GHSA-xq3w-v528-46rv",
- "modified": "2024-11-12T19:53:17Z",
+ "modified": "2024-11-12T19:53:19Z",
"published": "2024-11-12T19:53:17Z",
"aliases": [
"CVE-2024-47535"
@@ -9,13 +9,9 @@
"summary": "Denial of Service attack on windows app using netty",
"details": "### Summary\n\nAn unsafe reading of environment file could potentially cause a denial of service in Netty.\nWhen loaded on an Windows application, Netty attemps to load a file that does not exist. If an attacker creates such a large file, the Netty application crash.\n\n\n### Details\n\nWhen the library netty is loaded in a java windows application, the library tries to identify the system environnement in which it is executed.\n\nAt this stage, Netty tries to load both `/etc/os-release` and `/usr/lib/os-release` even though it is in a Windows environment. \n\n
\n\nIf netty finds this files, it reads them and loads them into memory.\n\nBy default :\n\n- The JVM maximum memory size is set to 1 GB,\n- A non-privileged user can create a directory at `C:\\` and create files within it.\n\n
\n\n
\n\nthe source code identified :\nhttps://github.com/netty/netty/blob/4.1/common/src/main/java/io/netty/util/internal/PlatformDependent.java\n\nDespite the implementation of the function `normalizeOs()` the source code not verify the OS before reading `C:\\etc\\os-release` and `C:\\usr\\lib\\os-release`.\n\n### PoC\n\nCreate a file larger than 1 GB of data in `C:\\etc\\os-release` or `C:\\usr\\lib\\os-release` on a Windows environnement and start your Netty application.\n\nTo observe what the application does with the file, the security analyst used \"Process Monitor\" from the \"Windows SysInternals\" suite. (https://learn.microsoft.com/en-us/sysinternals/)\n\n```\ncd C:\\etc\nfsutil file createnew os-release 3000000000\n```\n\n
\n\n
\n\nThe source code used is the Netty website code example : [Echo ‐ the very basic client and server](https://netty.io/4.1/xref/io/netty/example/echo/package-summary.html).\n\nThe vulnerability was tested on the 4.1.112.Final version.\n\nThe security analyst tried the same technique for `C:\\proc\\sys\\net\\core\\somaxconn` with a lot of values to impact Netty but the only things that works is the \"larger than 1 GB file\" technique. https://github.com/netty/netty/blob/c0fdb8e9f8f256990e902fcfffbbe10754d0f3dd/common/src/main/java/io/netty/util/NetUtil.java#L186\n\n### Impact\n\nBy loading the \"file larger than 1 GB\" into the memory, the Netty library exceeds the JVM memory limit and causes a crash in the java Windows application.\n\nThis behaviour occurs 100% of the time in both Server mode and Client mode if the large file exists.\n\nClient mode :\n\n
\n\nServer mode :\n\n
\n\nsomaxconn :\n\n
\n\n### Severity\n\n- Attack vector : \"Local\" because the attacker needs to be on the system where the Netty application is running.\n- Attack complexity : \"Low\" because the attacker only need to create a massive file (regardless of its contents).\n- Privileges required : \"Low\" because the attacker requires a user account to exploit the vulnerability.\n- User intercation : \"None\" because the administrator don't need to accidentally click anywhere to trigger the vulnerability. Furthermore, the exploitation works with defaults windows/AD settings.\n- Scope : \"Unchanged\" because only Netty is affected by the vulnerability.\n- Confidentiality : \"None\" because no data is exposed through exploiting the vulnerability.\n- Integrity : \"None\" because the explotation of the vulnerability does not allow editing, deleting or adding data elsewhere.\n- Availability : \"High\" because the exploitation of this vulnerability crashes the entire java application.\n",
"severity": [
- {
- "type": "CVSS_V3",
- "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
- },
{
"type": "CVSS_V4",
- "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:H/SI:H/SA:L/E:P"
+ "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"
}
],
"affected": [
@@ -64,7 +60,7 @@
"cwe_ids": [
"CWE-400"
],
- "severity": "HIGH",
+ "severity": "MODERATE",
"github_reviewed": true,
"github_reviewed_at": "2024-11-12T19:53:17Z",
"nvd_published_at": "2024-11-12T16:15:22Z"