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

Tenable 博客

订阅

CVE-2019-16928:Exim 中的严重缓冲区溢出缺陷受到远程利用

CVE-2019-16928, a critical heap-based buffer overflow vulnerability in Exim email servers, could allow remote attackers to crash Exim or potentially execute arbitrary code.

背景

Exim Internet Mailer, the popular message transfer agent (MTA) for Unix hosts found on nearly 5 million systems, is back in the news. Earlier this month, CVE-2019-15846, a critical remote code execution (RCE) flaw, was patched in Exim 4.92.2. In June, we blogged about CVE-2019-10149, another RCE, which saw exploit attempts within a week of public disclosure.

On September 28, Exim maintainers published an advance notice concerning a new vulnerability in Exim 4.92 up to and including 4.92.2. From our analysis of Shodan results, over 3.5 million systems may be affected.

分析

CVE-2019-16928 is a heap-based buffer overflow vulnerability due to a flaw in string_vformat() found in string.c. As noted in the bug report, the flaw was a simple coding error where the length of the string was not properly accounted for, leading to a buffer overflow condition. The flaw can be exploited by an unauthenticated remote attacker who could use a large crafted Extended HELO (EHLO) string to crash the Exim process that receives the message. This could potentially be further exploited to execute arbitrary code on the host. The flaw was found internally by the QAX A-Team, who submitted the patch. However, the bug is trivial to exploit, and it’s likely attackers will begin actively probing for and attacking vulnerable Exim MTA systems in the near future.

概念验证

As part of the patch, a proof of concept (PoC) is available which can be used to exploit the flaw and cause a denial of service (DoS) condition in an affected Exim server.

解决方案

The Exim team released version 4.92.3 on September 29 to address CVE-2019-16928. Administrators are encouraged to upgrade as soon as possible. No mitigations exist at this time.

识别受影响的系统

A list of Tenable plugins to identify this vulnerability 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 Vulnerability Management.

相关文章

您可加以利用的网络安全新闻

输入您的电子邮件,绝不要错过 Tenable 专家的及时提醒和安全指导。

Tenable Vulnerability Management

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。

Tenable Vulnerability Management 试用版还包含 Tenable Lumin 和 Tenable Web App Scanning。

Tenable Vulnerability Management

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。

100 项资产

选择您的订阅选项:

立即购买

Tenable Vulnerability Management

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。

Tenable Vulnerability Management 试用版还包含 Tenable Lumin 和 Tenable Web App Scanning。

Tenable Vulnerability Management

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。

100 项资产

选择您的订阅选项:

立即购买

Tenable Vulnerability Management

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。

Tenable Vulnerability Management 试用版还包含 Tenable Lumin 和 Tenable Web App Scanning。

Tenable Vulnerability Management

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。

100 项资产

选择您的订阅选项:

立即购买

试用 Tenable Web App Scanning

您可以通过 Tenable One 风险暴露管理平台完全访问我们专为现代应用程序量身打造的最新 Web 应用程序扫描产品。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。

Tenable Web App Scanning 试用版还包含 Tenable Vulnerability Management 和 Tenable Lumin。

购买 Tenable Web App 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

试用 Tenable Lumin

使用 Tenable Lumin 直观呈现及探索您的风险暴露管理,长期追踪风险降低状况,并比照同行业者进行基准衡量。

Tenable Lumin 试用版还包括 Tenable Vulnerability Management 和 Tenable Web App Scanning。

购买 Tenable Lumin

联系销售代表,了解 Tenable Lumin 如何帮助您获取整个企业的洞见并管理网络安全风险。

免费试用 Tenable Nessus Professional

免费试用 7 天

Tenable Nessus 是当今市场上功能最全面的漏洞扫描器。

新 - Tenable Nessus Expert
不可用

Nessus Expert 添加了更多功能,包括外部攻击面扫描,以及添加域和扫描云基础设施的功能。单击此处试用 Nessus Expert。

填写下面的表格可继续试用 Nessus Pro。

购买 Tenable Nessus Professional

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

购买多年期许可,即享优惠价格添加高级支持功能,获取一年 365 天、一天 24 小时的电话、社区和聊天支持。

选择您的许可证

购买多年期许可,即享优惠价格

添加支持和培训

免费试用 Tenable Nessus Expert

免费试用 7 天

Nessus Expert 针对现代攻击面而量身打造,可以查看更多信息,保护企业免遭从 IT 到云中漏洞的攻击。

已经有 Tenable Nessus Professional?
升级到 Nessus Expert,免费试用 7 天。

购买 Tenable Nessus Expert

Nessus Expert 针对现代攻击面而量身打造,可以查看更多信息,保护企业免遭从 IT 到云中漏洞的攻击。

选择您的许可证

购买多年许可证,节省幅度更大。

添加支持和培训