CVE-2017-15804 : Exploit Details and Defense Strategies
Learn about CVE-2017-15804, a buffer overflow vulnerability in the GNU C Library (glibc) before version 2.27, allowing attackers to execute arbitrary code. Find mitigation steps and long-term security practices here.
In the GNU C Library before version 2.27, a buffer overflow issue exists in the glob function when unescaping user names using the ~ operator.
Understanding CVE-2017-15804
This CVE entry describes a vulnerability in the GNU C Library (glibc) that could be exploited through a buffer overflow in the glob function.
What is CVE-2017-15804?
The vulnerability in the glob function of the GNU C Library allows for a buffer overflow during the unescaping of user names containing the ~ operator.
The Impact of CVE-2017-15804
- Attackers could potentially exploit this vulnerability to execute arbitrary code or cause a denial of service on affected systems.
Technical Details of CVE-2017-15804
This section provides more in-depth technical details about the CVE.
Vulnerability Description
The glob function in glob.c within the GNU C Library (glibc) before version 2.27 is susceptible to a buffer overflow when processing user names with the ~ operator.
Affected Systems and Versions
- The vulnerability affects GNU C Library versions prior to 2.27.
Exploitation Mechanism
- By crafting a malicious input containing the ~ operator, an attacker could trigger the buffer overflow in the glob function, potentially leading to arbitrary code execution.
Mitigation and Prevention
Protecting systems from CVE-2017-15804 involves taking immediate steps and implementing long-term security practices.
Immediate Steps to Take
- Update the GNU C Library to version 2.27 or newer to mitigate the vulnerability.
- Monitor for any unusual activities on the system that could indicate exploitation attempts.
Long-Term Security Practices
- Regularly apply security patches and updates to all software components to prevent known vulnerabilities.
- Implement proper input validation mechanisms to sanitize user inputs and prevent buffer overflows.
Patching and Updates
- Stay informed about security advisories and patches released by the GNU C Library maintainers to address vulnerabilities like the one described in CVE-2017-15804.