Ubuntu Linux ppp load_ppp_generic_if_needed MODPROBE_OPTIONS information disclosure

Summaryinfo

A vulnerability was found in Ubuntu Linux. It has been declared as problematic. This issue affects some unknown processing of the file /debian/patches/load_ppp_generic_if_needed of the component ppp. Executing a manipulation of the argument MODPROBE_OPTIONS as part of Environment Variable can lead to information disclosure. This vulnerability is handled as CVE-2020-15704. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Ubuntu Linux (Operating System) (version now known). This vulnerability affects some unknown processing of the file /debian/patches/load_ppp_generic_if_needed of the component ppp. The manipulation of the argument MODPROBE_OPTIONS as part of a Environment Variable leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

The modprobe child process in the ./debian/patches/load_ppp_generic_if_needed patch file incorrectly handled module loading. A local non-root attacker could exploit the MODPROBE_OPTIONS environment variable to read arbitrary root files. Fixed in 2.4.5-5ubuntu1.4, 2.4.5-5.1ubuntu2.3+esm2, 2.4.7-1+2ubuntu1.16.04.3, 2.4.7-2+2ubuntu1.3, 2.4.7-2+4.1ubuntu5.1, 2.4.7-2+4.1ubuntu6. Was ZDI-CAN-11504.

The weakness was released 09/01/2020 (Website). The advisory is shared for download at ubuntu.com. This vulnerability was named CVE-2020-15704 since 07/14/2020. The attack needs to be approached locally. Required for exploitation is a single authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Operating System

Vendor

• Ubuntu

Name

• Linux

License

• open-source

Website

• Vendor: https://www.ubuntu.com/

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