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May 11, 2022
CVE-2022-26923 - Active Directory Domain Services Elevation of Privilege Vulnerability
THE THREAT Microsoft has disclosed a new vulnerability impacting Active Directory Certificate Services (ADCS) tracked as CVE-2022-26923 (Active Directory Domain Services Elevation of Privilege Vulnerability). If exploited successfully, an authenticated attacker can escalate privileges in environments where ADCS is running on the domain. eSentire is aware of technical details and tooling [2] for…
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Waterloo, ON, May 17, 2022 — eSentire, the Authority in Managed Detection and Response (MDR), maintains one of the most secure and robust IT environments of any MDR provider in the industry. To that end, eSentire today announced that it has received the Payment Card Industry Data Security Standard (PCI DSS) certification, considered one of the most stringent and comprehensive payment card…
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Security advisories — Feb 27, 2019

Privilege Escalation Flaw in Windows Task Scheduler

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On August 27th, an independent security researcher released a vulnerability in Windows Task Scheduler [1]. If exploited the vulnerability would allow a threat actor, with pre-established access to the system, to raise their privilege from user-mode privileges to full system privileges. At the time of writing this attack has not been seen in the wild, but Proof of Concept (PoC) code has been publicly released, increasing the likelihood that threat actors will quickly adapt and employ this attack. Windows 10 and Windows Server 2016 systems are vulnerable to this privilege escalation method. The vulnerability and PoC were publicly released without giving the vendor notice; as such security patches are not yet available.

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Additional information

The major concern relating to this vulnerability is that threat actors may incorporate it into their malware. This would greatly increase the potential damage attacks by giving threat actors a higher privilege level than otherwise possible.

The flaw stems from the Task Scheduler API function, SchRpcSetSecurity, which fails to check permissions. Any account can call it and set file permissions on anything on the system [3].


References:

[1] Microsoft Windows task scheduler contains a local privilege escalation vulnerability in the ALPC interface Vulnerability Note VU#906424
https://www.kb.cert.org/vuls/id/906424

[2] CVE-2018-8440 | Windows ALPC Elevation of Privilege Vulnerability Security Vulnerability
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8440

[3] Double Pulsar: Task Scheduler ALPC exploit high-level analysis – CVE-2018–8440
https://doublepulsar.com/task-scheduler-alpc-exploit-high-level-analysis-ff08cda6ad4f

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