This week in infosec: links

February 9, 2022    Article    899 words    5 mins read

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Operation EmailThief: Active Exploitation of Zero-day XSS Vulnerability in Zimbra - In December 2021, through its Network Security Monitoring service, Volexity identified a series of targeted spear-phishing campaigns against one of its customers from a threat actor it tracks as TEMP_Heretic. Analysis of the emails from these spear phishing campaigns led to a discovery: the attacker was attempting to exploit a zero-day cross-site scripting (XSS) vulnerability in the Zimbra email platform. Zimbra is an open source email platform often used by organizations as an alternative to Microsoft Exchange.

Kasper: Scanning for Generalized Transient Execution Gadgets in the Linux Kernel - We present Kasper, a transient (or speculative) execution gadget scanner. It uses taint analysis policies to model an attacker capable of exploiting arbitrary software/hardware vulnerabilities on a transient path. Namely, it models an attacker capable of controlling data (e.g., via memory massaging or value injection a la LVI), accessing secrets (e.g., via out-of-bounds or use-after-free accesses), and leaking these secrets (e.g., via cache-based, MDS-based, or port contention-based covert channels). As a result, Kasper discovered 1,379 previously unknown gadgets in the heavily-hardened Linux kernel. We confirm our findings by demonstrating an end-to-end proof-of-concept exploit for one of the gadgets found.

Cisco Small Business RV Series Routers Vulnerabilities - Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker to do any of the following:

  • Execute arbitrary code
  • Elevate privileges
  • Execute arbitrary commands
  • Bypass authentication and authorization protections
  • Fetch and run unsigned software
  • Cause denial of service (DoS)

CISA Adds One Known Exploited Vulnerability to Catalog - CISA has added one new vulnerability to its Known Exploited Vulnerabilities Catalog, based on evidence that threat actors are actively exploiting the vulnerabilities listed in the table below. These types of vulnerabilities are a frequent attack vector for malicious cyber actors of all types and pose significant risk to the federal enterprise.

Path traversal and dereference of symlinks when passing Helm value files - All versions of Argo CD are vulnerable to a path traversal bug that allows to pass arbitrary values files to be consumed by Helm charts.

Additionally, it is possible to craft special Helm chart packages containing value files that are actually symbolic links, pointing to arbitrary files outside the repository’s root directory.

If an attacker with permissions to create or update Applications knows or can guess the full path to a file containing valid YAML, they can create a malicious Helm chart to consume that YAML as values files, thereby gaining access to data they would otherwise have no access to.

Decrypted: TargetCompany Ransomware - On January 25, 2022, a victim of a ransomware attack reached out to us for help. The extension of the encrypted files and the ransom note indicated the TargetCompany ransomware (not related to Target the store), which can be decrypted under certain circumstances.

Distribution of Kimsuky Group’s xRAT (Quasar RAT) Confirmed - On January 26th, 2022, the ASEC analysis team has discovered that the Kimsuky group was using the xRAT (Quasar RAT-based open-source RAT) malware. According to the logs collected by AhnLab’s ASD (AhnLab Smart Defense) infrastructure, the attacker installed a variant of Gold Dragon on the first infected PC on January 24th.

Helping users stay safe: Blocking internet macros by default in Office - For years Microsoft Office has shipped powerful automation capabilities called active content, the most common kind are macros. While we provided a notification bar to warn users about these macros, users could still decide to enable the macros by clicking a button. Bad actors send macros in Office files to end users who unknowingly enable them, malicious payloads are delivered, and the impact can be severe including malware, compromised identity, data loss, and remote access.

Qbot Likes to Move It, Move It - Qbot (aka QakBot, Quakbot, Pinkslipbot ) has been around for a long time having first been observed back in 2007.

In this case, from October 2021, we will break down how Qbot quickly spread across all workstations in an environment, while stealing browser information and emails. While the case is nearly 5 months old, Qbot infections in the past week have followed the same pattern.

CVE-2022–22718 - SpoolFool: Windows Print Spooler Privilege Escalation (POC) - In this blog post, we’ll look at a Windows Print Spooler local privilege escalation vulnerability that I found and reported in November 2021. The vulnerability got patched as part of Microsoft’s Patch Tuesday in February 2022. We’ll take a quick tour of the components and inner workings of the Print Spooler, and then we’ll dive into the vulnerability with root cause, code snippets, images and much more.

Attackers Disguise RedLine Stealer as a Windows 11 Upgrade - Threat actors are always looking for topical lures to socially engineer victims into infecting systems. We recently analyzed one such lure, namely a fake Windows 11 installer. On 27 January 2022, the day after the final phase of the Windows 11 upgrade was announced, we noticed a malicious actor registered the domain windows-upgraded[.]com, which they used to spread malware by tricking users into downloading and running a fake installer. The domain caught our attention because it was newly registered, imitated a legitimate brand and took advantage of a recent announcement. The threat actor used this domain to distribute RedLine Stealer, an information stealing malware family that is widely advertised for sale within underground forums.