CVE-2007-3024 in ClamAV
Summary
by MITRE
libclamav/others.c in ClamAV before 0.90.3 and 0.91 before 0.91rc1 uses insecure permissions for temporary files that are created by the cli_gentempstream function in clamd/clamdscan, which might allow local users to read sensitive files.
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Analysis
by VulDB Data Team • 07/20/2021
The vulnerability identified as CVE-2007-3024 affects ClamAV versions prior to 0.90.3 and 0.91rc1, specifically within the libclamav/others.c component. This issue stems from insecure temporary file permissions that are created by the cli_gentempstream function located in clamd/clamdscan. The flaw represents a classic privilege escalation vector that exploits improper file system access controls to compromise system security. The vulnerability is particularly concerning because it allows local users to potentially read sensitive files that should normally be restricted. This type of vulnerability falls under the category of insecure temporary file handling, which is categorized as CWE-377 in the Common Weakness Enumeration framework. The insecure permissions typically manifest as overly permissive file modes that grant unnecessary read access to temporary files created during the scanning process.
The technical implementation of this vulnerability occurs when the cli_gentempstream function generates temporary files without properly setting restrictive file permissions. These temporary files often contain scanned content or intermediate processing data that may include sensitive information from the files being analyzed. When temporary files are created with insecure permissions, they can be accessed by any local user on the system, effectively bypassing the intended security boundaries of the scanning process. The operational impact extends beyond simple information disclosure, as these temporary files might contain fragments of protected documents, system files, or other sensitive data that could be exploited for further attacks. Attackers could potentially harvest this information to gain insights into system configuration, user activities, or even extract confidential data from the scanning environment.
The security implications of this vulnerability are significant within enterprise and organizational contexts where ClamAV is deployed for malware scanning and protection. Local users with minimal privileges could exploit this weakness to access data that should remain confidential, potentially leading to data breaches or information leakage. This vulnerability aligns with several techniques described in the MITRE ATT&CK framework under the T1005 and T1059 categories, which relate to data hijacking and privilege escalation through local system access. The attack surface is particularly wide since ClamAV is commonly deployed across various systems including servers, workstations, and network appliances where local user access is prevalent. Organizations running affected versions of ClamAV are at risk of having their temporary file system access controls bypassed, potentially exposing sensitive information that was meant to be protected during the scanning process.
The recommended mitigation strategy involves upgrading to ClamAV versions 0.90.3 or 0.91rc1 and later, which contain the necessary patches to address the insecure temporary file permission issue. System administrators should also implement additional monitoring of temporary file creation and access patterns to detect potential exploitation attempts. Security configurations should include regular audits of file permissions for temporary directories and the implementation of proper file access controls that align with the principle of least privilege. Organizations should consider deploying additional security controls such as mandatory access controls or enhanced file system monitoring to detect unauthorized access to temporary files. The fix implemented in the patched versions ensures that temporary files are created with restrictive permissions that prevent unauthorized access by local users, thereby maintaining the confidentiality of scanned content and preventing information disclosure vulnerabilities.