CVE-2018-19854 : Exploit Details and Defense Strategies
Learn about CVE-2018-19854, a vulnerability in the Linux kernel prior to version 4.19.3 that exposes sensitive memory to user programs. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
A vulnerability was found in the Linux kernel prior to version 4.19.3. The issue involves the crypto_report_one() function and its associated functions in crypto/crypto_user.c, which fail to fully initialize structures copied to userspace, potentially exposing sensitive memory to user programs. This vulnerability is a regression of CVE-2013-2547 but with easier exploitability.
Understanding CVE-2018-19854
This CVE affects the Linux kernel and poses a risk of exposing sensitive memory to user programs due to incomplete initialization of certain structures.
What is CVE-2018-19854?
CVE-2018-19854 is a vulnerability in the Linux kernel that allows attackers to potentially access sensitive memory without requiring special capabilities.
The Impact of CVE-2018-19854
The vulnerability could lead to the exposure of sensitive memory to user programs, posing a security risk to affected systems.
Technical Details of CVE-2018-19854
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The crypto_report_one() function and related functions in crypto/crypto_user.c do not fully initialize structures copied to userspace, potentially leaking sensitive memory to user programs.
Affected Systems and Versions
- Affected systems: Linux kernel versions before 4.19.3
- Affected versions: Not applicable
Exploitation Mechanism
- Attackers can exploit this vulnerability without requiring special capabilities, as long as the CONFIG_CRYPTO_USER kconfig option is present in the system.
Mitigation and Prevention
Protecting systems from CVE-2018-19854 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update the Linux kernel to version 4.19.3 or newer to mitigate the vulnerability.
- Monitor for any unusual activities that could indicate exploitation of the vulnerability.
Long-Term Security Practices
- Regularly update the Linux kernel and other software components to patch known vulnerabilities.
- Implement strong access controls and least privilege principles to limit potential attack surfaces.
Patching and Updates
- Apply patches provided by Linux distributions and vendors to address the vulnerability.