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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, 2020

Memory Corruption Vulnerability in Microsoft Exchange Servers

2 min read

THE THREAT

On February 11th, 2020 Microsoft disclosed a Memory Corruption Vulnerability in Microsoft Exchange Servers [1]. An authenticated user could exploit this vulnerability to cause remote code execution (RCE) on vulnerable Microsoft Exchange Servers. It is probable that public exploitation of the vulnerability will occur in the near future, as proof of concept code was released on February 24th, and mass scanning was identified on February 25th.

Successful exploitation of this RCE vulnerability could lead to further compromise of the targeted systems. It is highly recommended that organizations apply the official Microsoft security patches as soon as possible to avoid being impacted.

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Additional information

During installation, Microsoft Exchange Server fails to generate a unique validation key. Knowledge of the default key would allow an attacker to pass arbitrary objects to be deserialized by the web application which could lead to arbitrary code execution as SYSTEM.

February 24th,2020 Proof of Concept (PoC) code was published, demonstrating exploitation of the vulnerability [2]. The next day, Twitter user @bad_packets observed mass scanning for CVE-2020-0688 [3].

For additional technical details, see the ZDI technical write up [2].

Updates for Affected Products:

References:

[1] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0688

[2] https://www.thezdi.com/blog/2020/2/24/cve-2020-0688-remote-code-execution-on-microsoft-exchange-server-through-fixed-cryptographic-keys

[3] https://twitter.com/bad_packets/status/1232428319733272579