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Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
August 21, 2023
Severity High Analysis Summary Gafgyt is a type of malware that is used to conduct Distributed Denial of Service (DDoS) attacks. These attacks involve overwhelming a […]August 21, 2023
Severity High Analysis Summary A significant security vulnerability has been resolved in WinRAR v6.22, a widely-used Windows utility for archiving files. Tracked as CVE-2023-40477, this flaw […]August 21, 2023
Severity Medium Analysis Summary AsyncRAT is an open-source tool designed for remote monitoring via encrypted connections. However, it could be utilized by threat actors as it […]Threat Insights
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.
Connect with Us
Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
August 21, 2023
Severity High Analysis Summary Gafgyt is a type of malware that is used to conduct Distributed Denial of Service (DDoS) attacks. These attacks involve overwhelming a […]August 21, 2023
Severity High Analysis Summary A significant security vulnerability has been resolved in WinRAR v6.22, a widely-used Windows utility for archiving files. Tracked as CVE-2023-40477, this flaw […]August 21, 2023
Severity Medium Analysis Summary AsyncRAT is an open-source tool designed for remote monitoring via encrypted connections. However, it could be utilized by threat actors as it […]Threat Insights
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.
Connect with Us
Rewterz Threat Alert – AsyncRAT – Active IOCs
August 21, 2023
Rewterz Threat Alert – Gafgyt aka Bashlite Malware – Active IOCs
August 21, 2023
Severity
High
Analysis Summary
A significant security vulnerability has been resolved in WinRAR v6.22, a widely-used Windows utility for archiving files. Tracked as CVE-2023-40477, this flaw could potentially allow remote attackers to execute arbitrary code on a victim’s system by simply opening a specially crafted RAR file.
A researcher reported this vulnerability on June 8th, 2023. The issue is rooted in the processing of recovery volumes, where inadequate validation of user data leads to memory access beyond allocated buffers.
In terms of severity, the vulnerability holds a CVSS rating of 7.8. While its rating is slightly reduced due to the requirement of user engagement in opening the compromised archive, convincing users to perform this action is not necessarily difficult. Given the substantial user base of WinRAR, malicious actors could find numerous opportunities for successful exploitation.
The immediate mitigation strategy involves the release of a new version of WinRAR that effectively addresses the vulnerability on August 2nd, 2023. This update not only fixes the vulnerability related to recovery volumes processing code but also addresses another high-severity issue tied to incorrectly initiated files within specially crafted archives.
It’s noteworthy that an upcoming operating system version is embracing native support for similar file formats. This move may diminish the need for third-party software like WinRAR, except in cases where advanced functionalities are required. For users still reliant on WinRAR, proactive steps involve regular updates to the software. A history of similar vulnerabilities being exploited by hackers underscores the importance of maintaining security-conscious behaviors, such as prudent selection of files to open and utilizing antivirus tools capable of scanning content.
Impact
- Code Execution
- Unauthorized Access
- Exposure Of Sensitive Data
Indicators Of Compromise
CVE
- CVE-2023-40477
Remediation
- Upgrade to the latest version of WinRAR, available from the WinRAR Web site.
- Regularly update software and applications to stay protected against known vulnerabilities.
- Exercise caution when opening RAR files from unknown or untrusted sources.
- Implement robust antivirus and security software to detect and prevent potential threats.
- Consider using native file format support available in operating systems to reduce reliance on third-party utilities.
- Educate users about safe browsing practices and the importance of avoiding suspicious or unverified content.
- Monitor system behavior for unusual activities that might indicate an exploit or breach.
- Maintain secure backup copies of important data to mitigate the impact of potential attacks.
- Follow best practices for cybersecurity, such as strong password policies and network segmentation.
- Stay informed about emerging threats and vulnerabilities through reliable security sources.