CVE-2017-8929 : Exploit Details and Defense Strategies
Learn about CVE-2017-8929 affecting YARA 3.5.0. Discover the impact, technical details, affected systems, exploitation method, and mitigation steps to secure your systems.
YARA 3.5.0 is susceptible to a denial of service vulnerability due to a crafted rule causing a use-after-free scenario and application crash.
Understanding CVE-2017-8929
What is CVE-2017-8929?
The vulnerability in YARA 3.5.0 arises from the sized_string_cmp function in libyara/sizedstr.c, enabling remote attackers to trigger a denial of service through a specific rule.
The Impact of CVE-2017-8929
The vulnerability can lead to a denial of service, potentially resulting in system crashes and disruption of YARA's functionality.
Technical Details of CVE-2017-8929
Vulnerability Description
The issue in YARA 3.5.0 allows attackers to exploit a use-after-free condition and crash the application by utilizing a maliciously crafted rule.
Affected Systems and Versions
- Product: YARA 3.5.0
- Vendor: N/A
- Version: N/A
Exploitation Mechanism
The vulnerability can be exploited remotely by sending specially crafted rules to the targeted YARA instance, triggering the use-after-free condition and subsequent application crash.
Mitigation and Prevention
Immediate Steps to Take
- Apply the latest patches and updates provided by YARA to address the vulnerability.
- Monitor security advisories for any new information or patches related to CVE-2017-8929.
Long-Term Security Practices
- Regularly update YARA to the latest version to ensure all security patches are applied.
- Implement network security measures to prevent unauthorized access to YARA instances.
Patching and Updates
It is crucial to promptly apply any security patches or updates released by YARA to mitigate the risk of exploitation of CVE-2017-8929.