CVE-2019-10639 : Exploit Details and Defense Strategies
Learn about CVE-2019-10639, a Linux kernel vulnerability allowing partial exposure of kernel addresses and bypassing KASLR. Find mitigation steps and long-term security practices here.
This CVE involves a vulnerability in the Linux kernel versions 4.x and 5.x, allowing for a bypass of Kernel Address Space Layout Randomization (KASLR) through partial exposure of kernel addresses.
Understanding CVE-2019-10639
This vulnerability enables attackers to extract the KASLR kernel image offset using IP ID values generated by the kernel for connection-less protocols like UDP and ICMP.
What is CVE-2019-10639?
The exposure of kernel addresses through IP ID values allows for hash collisions in counter array indices, revealing the hashing key and exposing the kernel image offset. This attack can be remotely executed by coercing devices to send UDP or ICMP traffic to attacker-controlled IP addresses.
The Impact of CVE-2019-10639
- Allows partial exposure of kernel addresses
- Bypasses Kernel Address Space Layout Randomization (KASLR)
- Enables remote execution of attacks by manipulating UDP or ICMP traffic
Technical Details of CVE-2019-10639
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
- Vulnerability in Linux kernel versions 4.x and 5.x
- Allows for extraction of KASLR kernel image offset through IP ID values
Affected Systems and Versions
- Linux kernel versions 4.x (from 4.1) and 5.x before 5.0.8
- Affected systems with partial kernel address exposure
Exploitation Mechanism
- Attackers can coerce devices to send UDP or ICMP traffic to controlled IP addresses
- Hash collisions in counter array indices reveal the hashing key
Mitigation and Prevention
Protecting systems from CVE-2019-10639 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security updates and patches promptly
- Monitor and restrict UDP and ICMP traffic
- Implement network segmentation to limit exposure
Long-Term Security Practices
- Regularly update and patch the Linux kernel
- Implement network intrusion detection systems
- Conduct security audits and penetration testing
Patching and Updates
- Stay informed about security advisories and updates
- Apply patches provided by Linux distributions and vendors
- Monitor for any signs of exploitation and unusual network activity