CVE Vulnerabilities

CVE-2016-4994

Use After Free

Published: Jul 12, 2016 | Modified: Feb 12, 2023
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
6.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P
RedHat/V2
2.6 MODERATE
AV:N/AC:H/Au:N/C:N/I:N/A:P
RedHat/V3
2.5 MODERATE
CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Ubuntu
MEDIUM

Use-after-free vulnerability in the xcf_load_image function in app/xcf/xcf-load.c in GIMP allows remote attackers to cause a denial of service (program crash) or possibly execute arbitrary code via a crafted XCF file.

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
Gimp Gimp * 2.8.18 (excluding)
Red Hat Enterprise Linux 7 RedHat gimp-2:2.8.16-3.el7 *
Red Hat Enterprise Linux 7 RedHat gimp-help-0:2.8.2-1.el7 *
Gimp Ubuntu devel *
Gimp Ubuntu esm-apps/xenial *
Gimp Ubuntu precise *
Gimp Ubuntu trusty *
Gimp Ubuntu upstream *
Gimp Ubuntu wily *
Gimp Ubuntu xenial *

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 happens 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