CVE-2021-44731 is a high-severity vulnerability found in the snapd 2.54.2 snap-confine binary. It arises from a race condition that occurs when preparing a private mount namespace for a snap. This vulnerability allows local attackers to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace. As a result, snap-confine may execute arbitrary code, leading to privilege escalation. This vulnerability has been fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04, and 2.54.3+21.10.1.
The CVSS score for this vulnerability is 7.8, indicating a high severity level. The exploitability is high, emphasizing the need for organizations to prioritize patching. Risk to organizations includes unauthorized access and potential system compromise.
Organizations using affected versions of snapd should address this vulnerability immediately to prevent exploitation. The urgency for defenders is critical, as local attackers can leverage this vulnerability with minimal effort.
This vulnerability is documented as CWE-362, indicating a race condition issue. With the potential impacts on confidentiality, integrity, and availability rated as high, the implications for affected systems could be significant.
Vulnerability Details
The official description states that a race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. The vulnerability has been addressed in snapd versions 2.54.3+18.04, 2.54.3+20.04, and 2.54.3+21.10.1.
The CVSS score for CVE-2021-44731 is 7.8, categorizing it as high severity. The attack vector is local, with a high attack complexity and low privileges required. No user interaction is necessary, and the scope of the vulnerability is changed, affecting confidentiality, integrity, and availability.
Technical Analysis
The root cause of this vulnerability is a race condition occurring during the setup of a private mount namespace. Attackers may leverage this vulnerability to execute arbitrary code with root privileges, which poses a severe security risk to systems running affected versions of snapd.
The attack vector is local, as the vulnerability can only be exploited from within the system where snapd is running. The attack complexity is deemed high, meaning that attackers need to conduct specific actions to exploit the vulnerability successfully.
Privileges required are low, indicating that any local user can potentially exploit the vulnerability without needing elevated permissions. User interaction is not required, making this flaw particularly dangerous.
The impacts on confidentiality, integrity, and availability are rated as high. An attacker exploiting this vulnerability could fully compromise the affected system, leading to significant operational risks.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2021-44731 is substantial. Organizations that do not address this vulnerability could face unauthorized access to sensitive data and system controls. The blast radius potential is significant as this vulnerability impacts multiple versions of snapd across various operating systems, including Ubuntu and Fedora.
The urgency assessment indicates that organizations should prioritize patching this vulnerability immediately. Given the high CVSS score and the nature of the exploit, rapid remediation is essential to safeguard against potential exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions of snapd include: 2.54.2 and all prior versions. Additionally, this vulnerability impacts Ubuntu Linux versions 18.04, 20.04, and 21.10, as well as Fedora versions 34 and 35, and Debian versions 10.0 and 11.0.
Mitigation & Remediation
Organizations should upgrade to snapd versions 2.54.3+18.04, 2.54.3+20.04, or 2.54.3+21.10.1 to mitigate this vulnerability. In cases where immediate patching is not possible, consider implementing strict access controls and monitoring systems for unusual activity.
For further guidance, organizations may refer to the application security assessment services offered to identify and remediate similar vulnerabilities.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual access patterns, particularly around the snap-confine binary. Look for behavioral anomalies that indicate unauthorized attempts to bind-mount contents into the private mount namespace.
AppSecure Threat Intelligence Insight
CVE-2021-44731 highlights the ongoing risk of privilege escalation vulnerabilities in widely used software components. Security teams should take note of the exploit patterns and ensure that their applications are regularly assessed for similar weaknesses.
For comprehensive security measures, organizations can explore our penetration testing services to proactively identify potential vulnerabilities.
Investing in a robust red teaming strategy can also enhance your organization's defense against such vulnerabilities.
Finally, continuous monitoring and updates are vital in maintaining the security posture against emerging threats. For further insights, consider our penetration testing methodology for best practices in vulnerability management.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)