CVE-2018-13417

published 2018-08-13

CVE-2018-13417: 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…

Priority P2 74 critical 9.8 CVSS 3.0

AV N AC L PR N UI N S U C H I H A H

EXPLOIT

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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
vuze	bittorrent_client	—	—

Detection & IOCs extracted from sources · hover to see the quote

url https://gitlab.com/initstring/evil-ssdp↗

ip 239.255.255.250↗

port 1900↗

path /ssdp/device-desc.xml↗

path /ssdp/xxe.html↗

path /ssdp/data.dtd↗

ua Azureus 5.7.6.0;Windows 10;Java 1.8.0_121↗

• → Monitor for outbound SMB (TCP/445) connections originating from the Vuze/Azureus process, which is anomalous and indicative of XXE-triggered SMB relay/capture. ↗
• → Detect HTTP GET requests to paths matching /ssdp/device-desc.xml, /ssdp/xxe.html, and /ssdp/data.dtd from User-Agent strings containing 'Azureus' or 'Java/', as these indicate active XXE exploitation against Vuze. ↗
• → Detect HTTP GET requests containing exfiltrated file data in the query string (e.g., /?exfiltrated=) originating from a Vuze host, indicating successful out-of-band XXE file exfiltration. ↗
• → Monitor UDP multicast traffic to 239.255.255.250:1900 (SSDP) for unsolicited M-SEARCH responses from non-legitimate UPnP devices on the LAN, which may be evil-ssdp instances staging an XXE attack. ↗
• → Inspect XML Device Descriptor responses served to Vuze over HTTP for the presence of DOCTYPE declarations with ENTITY tags referencing external file:// or UNC (\\) paths, which are the XXE payload mechanism. ↗

• · The attack requires the attacker to be on the same LAN as the victim; this is not a remotely exploitable vulnerability over the internet — network segmentation limits exposure. ↗
• · File exfiltration via XXE is limited to single-line files with no whitespace; multi-line or whitespace-containing files cannot be exfiltrated with the demonstrated POC. ↗
• · The vulnerability was verified on Windows 10 with Vuze 5.7.6.0 but older versions are also likely affected; the vendor did not respond to disclosure attempts. ↗

CVSS provenance

nvd v3.0 9.8 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.5 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P

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