Red Hat Insights Client LPE via Unsafe Temp Dir Handling
CVE-2023-3972 Published on November 1, 2023
Insights-client: unsafe handling of temporary files and directories
A vulnerability was found in insights-client. This security issue occurs because of insecure file operations or unsafe handling of temporary files and directories that lead to local privilege escalation. Before the insights-client has been registered on the system by root, an unprivileged local user or attacker could create the /var/tmp/insights-client directory (owning the directory with read, write, and execute permissions) on the system. After the insights-client is registered by root, an attacker could then control the directory content that insights are using by putting malicious scripts into it and executing arbitrary code as root (trivially bypassing SELinux protections because insights processes are allowed to disable SELinux system-wide).
Vulnerability Analysis
CVE-2023-3972 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Timeline
Reported to Red Hat.
Made public. 97 days later.
Weakness Type
Creation of Temporary File in Directory with Insecure Permissions
The software creates a temporary file in a directory whose permissions allow unintended actors to determine the file's existence or otherwise access that file. On some operating systems, the fact that the temporary file exists may be apparent to any user with sufficient privileges to access that directory. Since the file is visible, the application that is using the temporary file could be known. If one has access to list the processes on the system, the attacker has gained information about what the user is doing at that time. By correlating this with the applications the user is running, an attacker could potentially discover what a user's actions are. From this, higher levels of security could be breached.
Products Associated with CVE-2023-3972
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Affected Versions
Red Hat Enterprise Linux 7:- Version 0:3.1.9-1.el7_9 and below * is unaffected.
- Version 0:3.2.2-1.el8_8 and below * is unaffected.
- Version 0:3.2.3-1.el8_1 and below * is unaffected.
- Version 0:3.2.3-1.el8_2 and below * is unaffected.
- Version 0:3.2.3-1.el8_2 and below * is unaffected.
- Version 0:3.2.3-1.el8_2 and below * is unaffected.
- Version 0:3.2.3-1.el8_4 and below * is unaffected.
- Version 0:3.2.3-1.el8_4 and below * is unaffected.
- Version 0:3.2.3-1.el8_4 and below * is unaffected.
- Version 0:3.2.2-1.el8_6 and below * is unaffected.
- Version 0:3.2.2-1.el9_2 and below * is unaffected.
- Version 0:3.2.2-1.el9_0 and below * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.