CVE Vulnerabilities

CVE-2016-7857

Use After Free

Published: Nov 08, 2016 | Modified: May 16, 2019
CVSS 3.x
8.8
HIGH
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
9.3 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C
RedHat/V2
6.8 CRITICAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
RedHat/V3
8.8 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Ubuntu

Adobe Flash Player versions 23.0.0.205 and earlier, 11.2.202.643 and earlier have an exploitable use-after-free vulnerability. Successful exploitation could lead to arbitrary code execution.

Weakness

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

Affected Software

Name Vendor Start Version End Version
Red Hat Enterprise Linux 5 Supplementary RedHat flash-plugin-0:11.2.202.644-1.el5_11 *
Red Hat Enterprise Linux 6 Supplementary RedHat flash-plugin-0:11.2.202.644-1.el6_8 *
Adobe-flashplugin Ubuntu devel *
Adobe-flashplugin Ubuntu precise *
Adobe-flashplugin Ubuntu trusty *
Adobe-flashplugin Ubuntu xenial *
Adobe-flashplugin Ubuntu yakkety *
Flashplugin-nonfree Ubuntu devel *
Flashplugin-nonfree Ubuntu precise *
Flashplugin-nonfree Ubuntu trusty *
Flashplugin-nonfree Ubuntu xenial *
Flashplugin-nonfree Ubuntu yakkety *

Extended Description

The use of previously-freed memory can have any number of adverse consequences, ranging from the corruption of valid data to the execution of arbitrary code, depending on the instantiation and timing of the flaw. The simplest way data corruption may occur involves the system’s reuse of the freed memory. Use-after-free errors have two common and sometimes overlapping causes:

In this scenario, the memory in question is allocated to another pointer validly at some point after it has been freed. The original pointer to the freed memory is used again and points to somewhere within the new allocation. As the data is changed, it corrupts the validly used memory; this induces undefined behavior in the process. If the newly allocated data chances to hold a class, in C++ for example, various function pointers may be scattered within the heap data. If one of these function pointers is overwritten with an address to valid shellcode, execution of arbitrary code can be achieved.

Potential Mitigations

References