Menu

  • Alerts
  • Incidents
  • News
  • APTs
  • Cyber Decoded
  • Cyber Hygiene
  • Cyber Review
  • Cyber Tips
  • Definitions
  • Malware
  • Threat Actors
  • Tutorials

Useful Tools

  • Password generator
  • Report an incident
  • Report to authorities
No Result
View All Result
CTF Hack Havoc
CyberMaterial
  • Education
    • Cyber Decoded
    • Definitions
  • Information
    • Alerts
    • Incidents
    • News
  • Insights
    • Cyber Hygiene
    • Cyber Review
    • Tips
    • Tutorials
  • Support
    • Contact Us
    • Report an incident
  • About
    • About Us
    • Advertise with us
Get Help
Hall of Hacks
  • Education
    • Cyber Decoded
    • Definitions
  • Information
    • Alerts
    • Incidents
    • News
  • Insights
    • Cyber Hygiene
    • Cyber Review
    • Tips
    • Tutorials
  • Support
    • Contact Us
    • Report an incident
  • About
    • About Us
    • Advertise with us
Get Help
No Result
View All Result
Hall of Hacks
CyberMaterial
No Result
View All Result
Home Alerts

Critical regreSSHion RCE Flaw Hits Cisco

July 2, 2024
Reading Time: 2 mins read
in Alerts
Critical regreSSHion RCE Flaw Hits Cisco

Cisco has issued a security advisory about a critical remote code execution (RCE) vulnerability named “regreSSHion” affecting multiple products. This vulnerability, identified as CVE-2024-6387, impacts the OpenSSH server (sshd) on glibc-based Linux systems. Disclosed by the Qualys Threat Research Unit on July 1, 2024, the flaw allows unauthenticated attackers to gain root access to affected systems. The issue arises from a regression of an older vulnerability (CVE-2006-5051), reintroduced in OpenSSH version 8.5p1 released in October 2020.

The regreSSHion vulnerability involves a race condition in the sshd’s SIGALRM handler. This handler invokes functions that are not async-signal-safe, such as syslog(). Attackers can exploit this by initiating multiple connections and failing to authenticate within the LoginGraceTime period, triggering the vulnerable signal handler asynchronously. Cisco is actively investigating the extent of the impact across its product line and will update the advisory as more information becomes available.

To mitigate the risk of exploitation, Cisco recommends several steps. Users should restrict SSH access to trusted hosts only by applying infrastructure access control lists (ACLs) to prevent unauthorized access. Upgrading to the latest patched version of OpenSSH (9.8p1) is also advised. Additionally, setting the LoginGraceTime parameter to 0 in the sshd configuration file can prevent the race condition, although this might lead to denial-of-service if all connection slots are occupied.

The vulnerability poses a significant risk to a wide range of Cisco products. Although a proof-of-concept exploit code is available, its use requires customization and there have been no reported instances of malicious exploitation. Cisco urges customers to follow the recommended mitigation steps and apply necessary patches to protect their systems from potential attacks.

Reference:
  • Critical regreSSHion RCE Vulnerability in OpenSSH Affects Cisco Products
Tags: Ciscocritical remote code executionCyber AlertsCyber Alerts 2024Cyber threatsJuly 2024LinuxOpenSSHregreSSHionVulnerabilities
ADVERTISEMENT

Related Posts

Fake DocuSign Alerts Target Corporate Logins

Fake DocuSign Alerts Target Corporate Logins

May 28, 2025
Fake DocuSign Alerts Target Corporate Logins

Fake Bitdefender Site Spreads Venom Malware

May 28, 2025
Fake DocuSign Alerts Target Corporate Logins

Microsoft Void Blizzard Cyber Threat Alert

May 28, 2025
GhostSpy Android Malware Full Device Control

FBI Warns Luna Moth Targets US Law Firms

May 27, 2025
GhostSpy Android Malware Full Device Control

Winos 4.0 Malware Spread Via Fake Installers

May 27, 2025
GhostSpy Android Malware Full Device Control

GhostSpy Android Malware Full Device Control

May 27, 2025

Latest Alerts

Microsoft Void Blizzard Cyber Threat Alert

Fake DocuSign Alerts Target Corporate Logins

Fake Bitdefender Site Spreads Venom Malware

FBI Warns Luna Moth Targets US Law Firms

Winos 4.0 Malware Spread Via Fake Installers

GhostSpy Android Malware Full Device Control

Subscribe to our newsletter

    Latest Incidents

    Migos IG Hack Blackmails Solana Cofounder

    Tiffany & Co. Faces Data Breach Incident

    MathWorks Crippled by Ransomware Attack

    Everest Ransomware Leaks Coke Staff Data

    Adidas Data Breach Exposes Customer Contacts

    Semiconductor Firm AXT Hit by Data Breach

    CyberMaterial Logo
    • About Us
    • Contact Us
    • Jobs
    • Legal and Privacy Policy
    • Site Map

    © 2025 | CyberMaterial | All rights reserved

    Welcome Back!

    Login to your account below

    Forgotten Password?

    Retrieve your password

    Please enter your username or email address to reset your password.

    Log In

    Add New Playlist

    No Result
    View All Result
    • Alerts
    • Incidents
    • News
    • Cyber Decoded
    • Cyber Hygiene
    • Cyber Review
    • Definitions
    • Malware
    • Cyber Tips
    • Tutorials
    • Advanced Persistent Threats
    • Threat Actors
    • Report an incident
    • Password Generator
    • About Us
    • Contact Us
    • Advertise with us

    Copyright © 2025 CyberMaterial