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                              CERT-Renater

                 Note d'Information No. 2017/VULN236
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DATE                : 22/08/2017

HARDWARE PLATFORM(S):  /

OPERATING SYSTEM(S): Systems running Foxit Reader.

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http://www.zerodayinitiative.com/advisories/ZDI-17-691/
http://www.zerodayinitiative.com/advisories/ZDI-17-692/
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(0Day) Foxit Reader launchURL Command Injection Remote Code Execution
Vulnerability

ZDI-17-691: August 17th, 2017

CVE ID

CVE-2017-10951

CVSS Score

6.8, (AV:N/AC:M/Au:N/C:P/I:P/A:P)

Affected Vendors

Foxit

Affected Products

Reader


Vulnerability Details


This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Foxit Reader. User interaction is required
to exploit this vulnerability in that the target must visit a malicious
page or open a malicious file.

The specific flaw exists within app.launchURL method. The issue results
from the lack of proper validation of a user-supplied string before
using it to execute a system call. An attacker can leverage this
vulnerability to execute code under the context of the current process.


Vendor Response

Foxit states:


This vulnerability is being disclosed publicly without a patch in
accordance with the ZDI 120 day deadline.

"Foxit Reader & PhantomPDF has a Safe Reading Mode which is enabled by
default to control the running of JavaScript, which can effectively
guard against potential vulnerabilities from unauthorized JavaScript
actions."

05/18/17 - ZDI disclosed report to vendor
06/22/17 - ZDI inquired about status
06/26/17 - Vendor indicated that they could not reproduce the issue
06/26/17 - ZDI provided repro steps
06/26/17 - Vendor requested further repro details
07/06/17 - ZDI replied with sample scenario and the re-iterated the
           need for a fix
07/20/17 - The vendor indicated this will not be fixed because this can
           be mitigated by Secure Mode
08/08/17 - ZDI communicated that the proposed mitigation is not a fix
           and that the case will move to 0-day status


- -- Mitigation:
Given the nature of the vulnerability the only salient mitigation
strategy is to restrict interaction with the application to trusted
files.


Disclosure Timeline

2017-05-18 - Vulnerability reported to vendor
2017-08-17 - Coordinated public release of advisory


Credit
This vulnerability was discovered by:

Ariele Caltabiano (kimiya)

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(0Day) Foxit Reader saveAs Arbitrary File Write Remote Code Execution
Vulnerability

ZDI-17-692: August 17th, 2017

CVE ID

CVE-2017-10952

CVSS Score

7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)

Affected Vendors

Foxit


Affected Products

Reader


Vulnerability Details


This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Foxit Reader. User interaction is required
to exploit this vulnerability in that the target must visit a malicious
page or open a malicious file.

The specific flaw exists within the saveAs JavaScript function. The
issue results from the lack of proper validation of user-supplied data,
which can lead to writing arbitrary files into attacker controlled
locations. An attacker can leverage this vulnerability to execute code
under the context of the current process.


Vendor Response

Foxit states:


This vulnerability is being disclosed publicly without a patch in
accordance with the ZDI 120 day deadline.

"Foxit Reader & PhantomPDF has a Safe Reading Mode which is enabled by
default to control the running of JavaScript, which can effectively
guard against potential vulnerabilities from unauthorized JavaScript
actions."

06/22/17 - ZDI disclosed report to vendor
06/22/17 - Vendor acknowledged and communicated fix would be included
           in next version
06/22/17 - The vendor indicated this will not be fixed because this can
           be mitigated by Secure Mode
07/06/17 - ZDI replied with sample scenario and the re-iterated the need
for a fix
07/20/17 - The vendor indicated this will not be fixed because this can
           be mitigated by Secure Mode
08/08/17 - ZDI communicated that the proposed mitigation is not a fix
           and that the case will move to 0-day status

- -- Mitigation:
Given the nature of the vulnerability the only salient mitigation
strategy is to restrict interaction with the application to trusted
files.

Disclosure Timeline

2017-06-22 - Vulnerability reported to vendor
2017-08-17 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:

Steven Seeley (mr_me) of Offensive Security

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+ CERT-RENATER          | tel : 01-53-94-20-44           +
+ 23 - 25 Rue Daviel    | fax : 01-53-94-20-41           +
+ 75013 Paris           | email: cert@support.renater.fr +
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