RPM up to 4.13.0.1 Temp File Table Name link following

Summaryinfo

A vulnerability marked as problematic has been reported in RPM up to 4.13.0.1. This impacts an unknown function of the component Temp File Handler. This manipulation as part of Table Name causes link following. This vulnerability is registered as CVE-2017-7501. The attack needs to be launched locally. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in RPM up to 4.13.0.1. Affected by this vulnerability is an unknown code of the component Temp File Handler. The manipulation as part of a Table Name leads to a link following vulnerability. The CWE definition for the vulnerability is CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

It was found that versions of rpm before 4.13.0.2 use temporary files with predictable names when installing an RPM. An attacker with ability to write in a directory where files will be installed could create symbolic links to an arbitrary location and modify content, and possibly permissions to arbitrary files, which could be used for denial of service or possibly privilege escalation.

The bug was discovered 09/15/2017. The weakness was published 11/22/2017 (Website). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2017-7501 since 04/05/2017. Attacking locally is a requirement. A single authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 53 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 104447 (Fedora 26 : rpm (2017-9232eac8e8)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171665 (SUSE Enterprise Linux Security Update for rpm (SUSE-SU-2018:3286-1)).

Upgrading to version 4.13.0.2 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (104447). Similar entry is available at VDB-122793. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• RPM

Version

• 4.13.0.0
• 4.13.0.1

License

• open-source

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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