CVE-2018-9251 Explained : Impact and Mitigation
Learn about CVE-2018-9251 affecting libxml2 2.9.8. Remote attackers can exploit this vulnerability by triggering an infinite loop through a crafted XML file, leading to denial of service.
CVE-2018-9251 was published on April 4, 2018, and affects libxml2 version 2.9.8 when the "--with-lzma" option is used. This vulnerability can be exploited by remote attackers to cause a denial of service through an infinite loop.
Understanding CVE-2018-9251
This CVE entry highlights a specific vulnerability in libxml2 version 2.9.8 that can be triggered by a crafted XML file.
What is CVE-2018-9251?
The xz_decomp function in xzlib.c within libxml2 2.9.8, when compiled with the "--with-lzma" option, allows remote attackers to exploit the system by causing a denial of service through an infinite loop. Attackers achieve this by providing a specially crafted XML file that triggers the LZMA_MEMLIMIT_ERROR.
The Impact of CVE-2018-9251
The vulnerability in libxml2 2.9.8 can lead to a denial of service condition due to the infinite loop caused by the exploitation of the xz_decomp function.
Technical Details of CVE-2018-9251
This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems, and exploitation mechanism.
Vulnerability Description
The xz_decomp function in xzlib.c within libxml2 2.9.8, when compiled with the "--with-lzma" option, can be exploited by remote attackers to cause a denial of service through an infinite loop triggered by a crafted XML file.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Version: Not applicable
Exploitation Mechanism
Attackers can exploit this vulnerability by providing a specially crafted XML file that triggers the LZMA_MEMLIMIT_ERROR, leading to a denial of service through an infinite loop.
Mitigation and Prevention
To address CVE-2018-9251, it is crucial to take immediate steps and implement long-term security practices.
Immediate Steps to Take
- Apply security updates provided by the vendor promptly.
- Monitor for any unusual system behavior that could indicate exploitation of the vulnerability.
Long-Term Security Practices
- Regularly update and patch software to mitigate known vulnerabilities.
- Implement network security measures to detect and prevent malicious activities.
Patching and Updates
Ensure that the affected systems are updated with the latest security patches to mitigate the risk of exploitation.