Sitecore Sitecore.NET 8.1 rev. 151207 Hotfix 141178-1 Log Viewer file path traversal

Summaryinfo

A vulnerability marked as critical has been reported in Sitecore Sitecore.NET 8.1 rev. 151207 Hotfix 141178-1. This affects an unknown function of the file sitecore/shell/default.aspx?xmlcontrol=LogViewerDetails/file of the component Log Viewer. The manipulation leads to path traversal. This vulnerability is documented as CVE-2018-7669. The attack can be initiated remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Sitecore Sitecore.NET 8.1 rev. 151207 Hotfix 141178-1. This issue affects an unknown code of the file sitecore/shell/default.aspx?xmlcontrol=LogViewerDetails/file of the component Log Viewer. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, and integrity. The summary by CVE is:

An issue was discovered in Sitecore Sitecore.NET 8.1 rev. 151207 Hotfix 141178-1 and above. The 'Log Viewer' application is vulnerable to a directory traversal attack, allowing an attacker to access arbitrary files from the host Operating System using a sitecore/shell/default.aspx?xmlcontrol=LogViewerDetails&file= URI. Validation is performed to ensure that the text passed to the 'file' parameter correlates to the correct log file directory. This filter can be bypassed by including a valid log filename and then appending a traditional 'dot dot' style attack.

The bug was discovered 04/23/2018. The weakness was released 04/27/2018 (Website). It is possible to read the advisory at seclists.org. The identification of this vulnerability is CVE-2018-7669 since 03/05/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k.

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

The vulnerability is also documented in the vulnerability database at Exploit-DB (45152). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Sitecore

Name

• Sitecore.NET

Version

• 8.1 rev. 151207 Hotfix 141178-1

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

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