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Jul 26, 2021
PetitPotam NTLM Relay Attack
THE THREAT PetitPotam is a variant of NTLM Relay attacks discovered by security researcher Gilles Lionel. Proof of Concept code released last week [1] relies on the Encrypting File System Remote (EFSRPC) protocol to provoke a Windows host into performing an NTLM authentication request against an attacker-controlled server, exposing NTLM authentication details or authentication certificates.…
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Tecala and eSentire Partner to Protect Enterprises across APAC from Business-Disrupting Cyber Attacks
Sydney, 12 July, 2021 - Tecala, Australia’s award-winning technology services and IT consulting provider, today announced it has chosen eSentire, the global Authority in Managed Detection and Response (MDR) cybersecurity services, as their exclusive MDR solution provider in Australia and New Zealand. This partnership will enable Tecala to augment its cybersecurity practice and offer enterprises…
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Security advisories — Feb 27, 2019

Privilege Escalation Flaw in Windows Task Scheduler

2 min read

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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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