A vulnerability was found in Open Build Service (unknown version). It has been declared as critical. Affected by this vulnerability is the function bs_worker. The manipulation with an unknown input 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, integrity, and availability. The summary by CVE is:

The bs_worker code in open build service before 20170320 followed relative symlinks, allowing reading of files outside of the package source directory during build, allowing leakage of private information.

The bug was discovered 03/17/2017. The weakness was published 03/01/2018 as Bug 1029824 as not defined bug report (Bugzilla). The advisory is shared at bugzilla.suse.com. This vulnerability is known as CVE-2017-5188 since 01/06/2017. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k.

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

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

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• Open Build Service

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• open-source

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