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    May 28, 2023
    Rewterz
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    Rewterz Threat Update – Barracuda Issues Warning Regarding Zero-Day Exploitation to Breach Email Security Gateway (ESG) Appliances
    Severity High Analysis Summary An email protection and network security services provider has issued a warning regarding a zero-day vulnerability that has been exploited to compromise […]
    May 26, 2023
    Rewterz
    May 26, 2023
    Rewterz Threat Advisory – Multiple D-Link D-View Vulnerabilities
    Severity High Analysis Summary CVE-2023-32165 CVSS:9.8 D-Link D-View could allow a remote attacker to execute arbitrary code on the system, caused by a flaw in TftpReceiveFileHandler […]

    Threat Insights

    16
    pdf-file (1)
    Annual Threat Intelligence Report 2022
    • Threat Advisories
    • Monthly Threat Insights
    • Threat Intelligence Reports
  • Why Rewterz?

    About Us

    Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.

    Read More

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    At Rewterz, we believe that businesses have a responsibility to impact positively and contribute to the well-being of our communities as well as the planet. That's why we are committed to operating in a socially responsible and sustainable way.

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Rewterz Threat Advisory – Microsoft Windows ‘SchRpcSetSecurity()’ Privilege Escalation Vulnerability

August 29, 2018

 A vulnerability in Microsoft Windows Task Scheduler can be exploited to gain escalated privileges.

IMPACT: MEDIUM

PUBLISH DATE: 28-08-2018

OVERVIEW

Elevated SYSTEM privileges can be gained by exploiting an error in the Microsoft Windows task scheduler. The error occurs while handling the ALPC calls related to the “SchRpcSetSecurity()” function.

 

ANALYSIS

In the handling of ALPC calls, the Microsoft Windows task scheduler contains a vulnerability which can permit a local user to gain System privileges, without needing authentication.

 

The public exploit code works on 64-bit Windows 10 and Windows Server 2016 systems. The publicly-available exploit source code can be modified to make it compatible to other systems.

 

_SchRpcSetSecurity, a part of the task scheduler ALPC endpoint, allows us to set an arbitrary DACL. It will Set the security of a file in c:\windows\tasks. Even a Guest can write here without impersonating. Before the task scheduler writes the DACL we can create a hard link to any file we have read access over. This will result in an arbitrary DACL write. This PoC will overwrite a printer related dll and use it as a hijacking vector. This is just one of the many options to abuse this.

 

The error in the Task Scheduler is that the API function SchRpcSetSecurity fails to check permissions, allowing even a guest to call it and set file permissions on anything.The vulnerability was discovered by SandboxEscaper and needs prior code execution to exploit.

 

AFFECTED PRODUCTS

Exploit currently only works on 64-bit OSes (likely Win 10 and Server 2016).

 

MITIGATION

There is currently no practical solution to address the vulnerability. Therefore, extra vigilance is required in monitoring a network user’s behavior. Network traffic analytics should be used to detect unusual behavior from traffic going across the network.

 

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