Apple Safari: Execute Arbitrary Code/Commands -- Remote with User Interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2229
          Apple Safari HTMLSlotElement Use-After-Free Remote Code
                          Execution Vulnerability
                             6 September 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Apple Safari
Publisher:         Zero Day Initiative
Operating System:  Mac OS
                   Linux variants
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-7071  

Original Bulletin: 
   http://www.zerodayinitiative.com/advisories/ZDI-17-714/

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Mac OS. It is recommended that administrators 
         running Apple Safari check for an updated version of the software 
         for their operating system.

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Apple Safari HTMLSlotElement Use-After-Free Remote Code Execution 
Vulnerability

ZDI-17-714: September 5th, 2017

CVE ID

CVE-2017-7071

CVSS Score

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

Affected Vendors

Apple

Affected Products

Safari

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on 
vulnerable installations of Apple Safari. 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 handling of HTMLSlotElement objects. The 
issue results from the lack of validating the existence of an object prior to
performing operations on the object. An attacker can leverage this 
vulnerability to execute code under the context of the current process.

Vendor Response

Apple has issued an update to correct this vulnerability. More details can be
found at:

https://support.apple.com/HT207600

Disclosure Timeline

2017-03-09 - Vulnerability reported to vendor

2017-09-05 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:

Kai Kang(a.k.a 4B5F5F4B) of Tencent's Xuanwu LAB(http://www.tencent.com)

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