CVE-2008-0598 in Linux
Summary
by MITRE
Unspecified vulnerability in the 32-bit and 64-bit emulation in the Linux kernel 2.6.9, 2.6.18, and probably other versions allows local users to read uninitialized memory via unknown vectors involving a crafted binary.
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Analysis
by VulDB Data Team • 08/12/2019
The vulnerability described in CVE-2008-0598 represents a critical security flaw within the Linux kernel's emulation layer that affects both 32-bit and 64-bit architectures. This issue manifests in kernel versions 2.6.9 and 2.6.18, with the potential for affecting other versions in the same release series. The vulnerability stems from improper handling of uninitialized memory within the kernel's emulation mechanisms, creating a pathway for local attackers to access sensitive data that should remain protected from user-space processes. The unspecified nature of the vulnerability vectors suggests that multiple attack pathways may exist within the emulation subsystem, making the flaw particularly concerning for security professionals who must account for various potential exploitation methods.
The technical implementation of this vulnerability lies within the kernel's binary emulation capabilities, which are designed to allow execution of binaries compiled for different architectures on the same system. When a crafted binary is executed, the kernel's emulation layer fails to properly initialize memory regions before accessing them, leading to information disclosure through the reading of uninitialized memory contents. This type of vulnerability falls under the category of information disclosure flaws, specifically aligning with CWE-248, which addresses the exposure of uninitialized variables in software implementations. The attack vector requires local system access, meaning that an attacker must already have user-level privileges on the target system to exploit this vulnerability effectively.
From an operational impact perspective, this vulnerability presents significant risks to system security and data integrity. Local users who can execute crafted binaries gain access to potentially sensitive kernel memory that may contain cryptographic keys, passwords, user credentials, or other confidential information that was not intended for user-space access. The implications extend beyond simple information disclosure, as this access could potentially lead to privilege escalation or further exploitation attempts. The vulnerability's presence in widely-used kernel versions means that numerous systems across different environments could be affected, creating a substantial attack surface for malicious actors who have already gained local access to target systems. This aligns with ATT&CK technique T1068, which describes the use of local privilege escalation techniques to gain higher-level system access.
The mitigation strategies for CVE-2008-0598 primarily involve applying the appropriate kernel security patches that address the uninitialized memory access issue within the emulation subsystem. System administrators should prioritize updating to kernel versions that contain fixes for this vulnerability, ensuring that the patches properly address the memory initialization issues in both 32-bit and 64-bit emulation contexts. Additionally, implementing proper access controls and limiting local user privileges can help reduce the attack surface for this vulnerability. The remediation process should include thorough testing of updated kernel versions to ensure that system functionality remains intact while addressing the security concerns. Organizations should also conduct comprehensive vulnerability assessments to identify systems running affected kernel versions and prioritize their patching efforts accordingly, considering the potential for this vulnerability to be leveraged as part of broader exploitation campaigns.