Vuze BitTorrent Client 5.7.6.0 XML Parsing Engine xml external entity reference

Summaryinfo

A vulnerability identified as critical has been detected in Vuze BitTorrent Client 5.7.6.0. Affected is an unknown function of the component XML Parsing Engine. This manipulation causes xml external entity reference. This vulnerability appears as CVE-2018-13417. The attack may be initiated remotely. In addition, an exploit is available.

Detailsinfo

A vulnerability was found in Vuze BitTorrent Client 5.7.6.0 (Peer-to-Peer Software). It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component XML Parsing Engine. The manipulation with an unknown input leads to a xml external entity reference vulnerability. The CWE definition for the vulnerability is CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In Vuze Bittorrent Client 5.7.6.0, the XML parsing engine for SSDP/UPnP functionality is vulnerable to an XML External Entity Processing (XXE) attack. Remote, unauthenticated attackers can use this vulnerability to: (1) Access arbitrary files from the filesystem with the same permission as the user account running Vuze, (2) Initiate SMB connections to capture a NetNTLM challenge/response and crack to cleartext password, or (3) Initiate SMB connections to relay a NetNTLM challenge/response and achieve Remote Command Execution in Windows domains.

The bug was discovered 08/03/2018. The weakness was presented 08/13/2018 as not defined mailinglist post (Full-Disclosure). It is possible to read the advisory at seclists.org. This vulnerability is known as CVE-2018-13417 since 07/06/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available.

It is possible to download the exploit 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 10 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 (45145). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Peer-to-Peer Software

Vendor

• Vuze

Name

• BitTorrent Client

Version

• 5.7.6.0

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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