CUPS up to 2.2.1 IPP scheduler/client.c valid_host POST Request 7pk security

Summaryinfo

A vulnerability was found in CUPS up to 2.2.1. It has been rated as critical. The impacted element is the function valid_host of the file scheduler/client.c of the component IPP. Performing a manipulation as part of POST Request results in 7pk security. This vulnerability is known as CVE-2017-18190. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in CUPS up to 2.2.1 (Printing Software). It has been classified as critical. This affects the function valid_host of the file scheduler/client.c of the component IPP. The manipulation as part of a POST Request leads to a 7pk security vulnerability. CWE is classifying the issue as CWE-254. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A localhost.localdomain whitelist entry in valid_host() in scheduler/client.c in CUPS before 2.2.2 allows remote attackers to execute arbitrary IPP commands by sending POST requests to the CUPS daemon in conjunction with DNS rebinding. The localhost.localdomain name is often resolved via a DNS server (neither the OS nor the web browser is responsible for ensuring that localhost.localdomain is 127.0.0.1).

The bug was discovered 01/03/2017. The weakness was published 02/16/2018 (Website). The advisory is shared at bugs.chromium.org. This vulnerability is uniquely identified as CVE-2017-18190 since 02/16/2018. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1211 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 409 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 106953 (Debian DLA-1288-1 : cups security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170916 (OpenSUSE Security Update for cups (openSUSE-SU-2018:0618-1)).

Upgrading to version 2.2.2 eliminates this vulnerability. A possible mitigation has been published 6 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (106953). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Printing Software

Name

• CUPS

Version

• 2.2.0
• 2.2.1

License

• open-source

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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