Facebook Google Plus Twitter LinkedIn YouTube RSS Menu Search Resource - BlogResource - WebinarResource - ReportResource - Eventicons_066 icons_067icons_068icons_069icons_070

CVE-2019-15107: Webmin 中的远程代码执行漏洞已有可用的漏洞利用模块

The popular Linux/UNIX systems management tool has more than 3 million downloads per year and the vulnerability has been present for at least a year, putting many virtual UNIX management systems at risk.

Background

On August 17, Webmin version 1.930 was released to address a remote code execution (RCE) vulnerability (CVE-2019-15107) present in Webmin versions 1.882 to 1.921. According to the Virtualmin site, “Webmin is the world's most popular Linux/UNIX systems management UI, with over three million downloads per year.” These vulnerabilities do have publicly available exploit modules, which puts many virtual UNIX management systems at risk.

The security notice indicates that version 1.890 (CVE-2019-15231) is vulnerable in the default configuration, while the other affected versions require the “user password change” option to be enabled. According to a BinaryEdge search, there are nearly 28,000 publicly accessible systems running version 1.890 of webmin.

CVE-2019-15107: Webmin 中的远程代码执行漏洞已有可用的漏洞利用模块

Analysis

An attacker can send a malicious http request to the password reset request form page to inject code and take over the webmin web application. According to the vulnerability writeup, an attacker does not need a valid username or password in order to exploit this flaw. The existence of this feature means this vulnerability has potentially been present in Webmin since July 2018.

According to a Webmin release note, the company’s security team “...received no advance notification of it, which is unusual and unethical on the part of the researcher who discovered it. But, in such cases there's nothing we can do but fix it ASAP.” While not entirely unheard of, unannounced public disclosures of vulnerabilities are uncommon, even at DEF CON, especially when the organization in question has a cash bug bounty program, as Webmin does.

This vulnerability disclosure comes on the heels of CVE-2019-12840, another RCE vulnerability that was disclosed by AKKUS back in June 2019. Webmin has stated for CVE-2019-12840, “This is NOT a workable exploit as it requires that the attacker already know the root password. Hence there is no fix for it in Webmin.”

Proof of concept

AKKUS has posted a full writeup with a detailed explanation of proof of concept code and an exploit module.

解决方案

Updating to Webmin 1.930 or disabling the “user password change” option in Webmin will mitigate CVE-2019-15107, but restricting "Package Updates" module access is the only mitigation step available to prevent exploitation of CVE-2019-12840. Additionally, the Webmin team has noted that 1.930 addresses some cross-site scripting (XSS) vulnerabilities as well and encourages users to upgrade even if the password expiry policy option is not in use.

识别受影响的系统

A list of Nessus plugins to identify these vulnerabilities will appear here as they’re released.

获取更多信息

加入 Tenable Community 中的 Tenable 安全响应团队

了解有关 Tenable 这款首创 Cyber Exposure 平台的更多信息,全面管理现代攻击面。

Get a free 60-day trial of Tenable.io.

订阅 Tenable 博客

订阅
免费试用 立即购买

选择 Tenable.io

免费试用 30 天

可全面访问基于云的现代化漏洞管理平台,从而以无可比拟的精确度发现并追踪所有资产。 立即注册。

立即购买 Tenable.io

可全面访问基于云的现代化漏洞管理平台,从而以无可比拟的精确度发现并追踪所有资产。 立即购买年度订阅。

65 项资产

$2,275

立即购买

免费试用 立即购买

免费试用 Nessus Professional

免费试用 7 天

Nessus® 是当今市场上功能最全面的漏洞扫描器。Nessus Professional 可帮助自动化漏洞扫描流程、节省合规周期的时间,并让您调动起 IT 团队的积极性。

购买 Nessus Professional

Nessus® 是当今市场上功能最全面的漏洞扫描器。Nessus Professional 可帮助自动化漏洞扫描流程、节省合规周期的时间,并让您调动起 IT 团队的积极性。

购买多年期许可,即享优惠价格添加高级版支持功能,获取一年 365 天、一天 24 小时的电话、邮件、社区和聊天支持。完整介绍请见此处。

购买 Nessus Professional

即享免费高级版支持

免费试用 立即购买

试用 Tenable.io Web Application Scanning

免费试用 30 天

完整享有专为现代化应用程序而设、属于 Tenable.io 平台组成部分的最新 Web 应用程序扫描功能。可安全扫描全部在线资产组合的漏洞,具有高度准确性,而且无需繁重的手动操作或中断关键的 Web 应用程序。 立即注册。

购买 Tenable.io Web Application Scanning

可全面访问基于云的现代化漏洞管理平台,从而以无可比拟的精确度发现并追踪所有资产。 立即购买年度订阅。

5 个 FQDN

$3,578

立即购买

免费试用 联系销售人员

试用 Tenable.io Container Security

免费试用 30 天

完整获得已集成至漏洞管理平台之唯一容器安全产品的功能。监控容器映像中的漏洞、恶意软件和策略违规。与持续集成和持续部署 (CI/CD) 系统进行整合,以支持 DevOps 实践、增强安全性并支持企业政策合规。

购买 Tenable.io Container Security

Tenable.io Container Security 经由与构建流程的集成,可供全面了解容器映像的安全性,包括漏洞、恶意软件和策略违规,借以无缝且安全地启用 DevOps 流程。

了解有关 Industrial Security 的详情

获取 Tenable.sc 演示

请将您的联系方式填写在下方表格中,我们的销售代表很快与您联系安排演示。您也可以写下简短评论(不得超过 255 个字符)。请注意,带星号 (*) 的字段为必填项。

免费试用 联系销售人员

试用 Tenable Lumin

免费试用 30 天

通过 Tenable Lumin 直观呈现及探索 Cyber Exposure,长期追踪风险降低状况,并比照同行业者进行基准度量。

购买 Tenable Lumin

联系销售代表,了解 Lumin 如何帮助获取整个企业的洞见并管理网络风险。

申请演示 Tenable.ot

获得符合需求的运营技术安全性。
降低避之不及的风险。