Ubuntu Linux Impacted By Decade-Old 'needrestart' Flaw That Gives Root

Five local privilege escalation (LPE) vulnerabilities in the Linux utility 'needrestart' -- widely used on Ubuntu to manage service updates -- allow attackers with local access to escalate privileges to root. The flaws were discovered by Qualys in needrestart version 0.8, and fixed in version 3.8. BleepingComputer reports: Complete information about the flaws was made available in a separate text file, but a summary can be found below:

- CVE-2024-48990: Needrestart executes the Python interpreter with a PYTHONPATH environment variable extracted from running processes. If a local attacker controls this variable, they can execute arbitrary code as root during Python initialization by planting a malicious shared library.
- CVE-2024-48992: The Ruby interpreter used by needrestart is vulnerable when processing an attacker-controlled RUBYLIB environment variable. This allows local attackers to execute arbitrary Ruby code as root by injecting malicious libraries into the process.
- CVE-2024-48991: A race condition in needrestart allows a local attacker to replace the Python interpreter binary being validated with a malicious executable. By timing the replacement carefully, they can trick needrestart into running their code as root.
- CVE-2024-10224: Perl's ScanDeps module, used by needrestart, improperly handles filenames provided by the attacker. An attacker can craft filenames resembling shell commands (e.g., command|) to execute arbitrary commands as root when the file is opened.
- CVE-2024-11003: Needrestart's reliance on Perl's ScanDeps module exposes it to vulnerabilities in ScanDeps itself, where insecure use of eval() functions can lead to arbitrary code execution when processing attacker-controlled input. The report notes that attackers would need to have local access to the operation system through malware or a compromised account in order to exploit these flaws. 'Apart from upgrading to version 3.8 or later, which includes patches for all the identified vulnerabilities, it is recommended to modify the needrestart.conf file to disable the interpreter scanning feature, which prevents the vulnerabilities from being exploited,' adds BleepingComputer.

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