CVE-2017-1000253 is a high-severity vulnerability in the Linux kernel, specifically affecting distributions that have not patched their long-term kernels. The vulnerability stems from the load_elf_binary() function, which fails to correctly allocate space for position-independent executables (PIE), potentially allowing a local attacker to escalate privileges. The vulnerability was fixed in April 2015 but went unrecognized as a security threat until recently.
The CVSS score of 7.8 indicates a high severity level, and the attack vector is classified as local with low complexity. Attackers may leverage this vulnerability to gain elevated privileges within affected systems. As a result, organizations using vulnerable Linux distributions are at risk of unauthorized access and potential system compromise.
Organizations should prioritize patching immediately. The urgency of this issue is underscored by its inclusion in the Known Exploited Vulnerabilities (KEV) catalog, indicating that active exploitation is occurring in the wild.
Given the potential impact, organizations must assess their systems for the presence of this vulnerability and implement necessary mitigations or patches as soon as possible.
Vulnerability Details
Linux distributions that have not patched their long-term kernels with the commit identified in CVE-2017-1000253 are vulnerable. The vulnerability affects various versions of CentOS and Red Hat Enterprise Linux, and it allows local attackers to escalate privileges through a flaw in the load_elf_binary() function. This vulnerability is classified under CWE-119.
Technical Analysis
The root cause of CVE-2017-1000253 is a flaw in how the load_elf_binary() function handles position-independent executables (PIEs). Specifically, it does not allocate enough space for all necessary segments of the binary, leading to the potential for subsequent segments being mapped into unintended memory areas. This vulnerability is particularly concerning when CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE is enabled, as it increases the chances of exploitation.
The attack vector is local, requiring the attacker to have access to the system to exploit this vulnerability. The attack complexity is low, with no user interaction required. The impact on confidentiality, integrity, and availability is classified as high, emphasizing the seriousness of this vulnerability.
Risk & Impact Analysis
Risk to organizations includes the potential for local privilege escalation, which could lead to unauthorized access to sensitive data or critical system controls. The blast radius of this vulnerability is significant, as it affects numerous Linux distributions, particularly CentOS and Red Hat Enterprise Linux. Given its high CVSS score, organizations must take immediate action to remediate this vulnerability.
Organizations should address this vulnerability in their priority patch cycle. This vulnerability is also associated with known ransomware campaigns, adding an additional layer of urgency to the remediation process.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | Yes |
Affected Versions
The following versions of CentOS and Red Hat Enterprise Linux are affected: CentOS 6.0 through 6.9, CentOS 7.1406 through 7.1611, and various versions of the Linux kernel from 2.6.25 to 4.0.2.
Mitigation & Remediation
Organizations should apply the necessary patches as outlined in vendor advisories. Specifically, users should upgrade to patched versions of the Linux kernel as soon as possible. If patches are unavailable, organizations should consider alternative mitigations or discontinue the use of affected systems.
For additional guidance, organizations can refer to the penetration testing services offered by AppSecure to validate their security posture.
Detection Guidance
Organizations should monitor for log indicators associated with this vulnerability, particularly anomalies in the behavior of applications utilizing the Linux kernel. Additionally, network signatures that indicate exploitation attempts should be established, as well as monitoring for unauthorized system changes.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2017-1000253 lies in its representation of vulnerabilities that may remain unaddressed in common open-source components. This vulnerability serves as a reminder for security teams to maintain vigilance in patch management and vulnerability assessments to safeguard against potential exploitations.
Organizations can improve their resilience against such vulnerabilities by implementing a robust vulnerability management program and conducting regular security assessments.
Furthermore, adopting a proactive approach through continuous penetration testing can help identify and remediate vulnerabilities before they can be exploited. For more insights, refer to AppSecure's penetration testing methodology for best practices.
Lastly, organizations should stay informed on trends in vulnerability exposure and ransomware targeting to adapt their security strategies accordingly.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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