CVE-2020-35499 : Exploit Details and Defense Strategies
Learn about CVE-2020-35499, a flaw in Linux kernel versions prior to 5.11 that could allow a local attacker to crash the system or leak kernel internal information. Find mitigation steps and preventive measures here.
A NULL pointer dereference flaw in Linux kernel versions prior to 5.11 may be seen if sco_sock_getsockopt function in net/bluetooth/sco.c do not have a sanity check for a socket connection, when using BT_SNDMTU/BT_RCVMTU for SCO sockets. This could allow a local attacker with a special user privilege to crash the system (DOS) or leak kernel internal information.
Understanding CVE-2020-35499
This CVE involves a vulnerability in the Linux kernel that could be exploited by a local attacker to cause a denial of service (DOS) or disclose sensitive kernel information.
What is CVE-2020-35499?
CVE-2020-35499 is a NULL pointer dereference flaw in Linux kernel versions prior to 5.11, specifically affecting the sco_sock_getsockopt function in net/bluetooth/sco.c.
The Impact of CVE-2020-35499
The vulnerability could allow a local attacker with specific user privileges to crash the system or reveal kernel internal data, potentially leading to a denial of service attack or information leakage.
Technical Details of CVE-2020-35499
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The flaw arises from the lack of a sanity check for a socket connection in the sco_sock_getsockopt function, particularly when utilizing BT_SNDMTU/BT_RCVMTU for SCO sockets.
Affected Systems and Versions
- Product: Kernel
- Vendor: N/A
- Versions Affected: Kernel 5.11
Exploitation Mechanism
The vulnerability can be exploited by a local attacker with specific user privileges.
Mitigation and Prevention
Protecting systems from CVE-2020-35499 requires immediate actions and long-term security measures.
Immediate Steps to Take
- Apply relevant patches and updates promptly.
- Monitor and restrict user privileges to minimize the risk of exploitation.
Long-Term Security Practices
- Regularly update and patch the Linux kernel to address known vulnerabilities.
- Implement strong access controls and user privilege management.
Patching and Updates
Ensure that the affected systems are updated with the latest patches provided by the Linux kernel maintainers.