External risk intelligence

ImageMagick Arbitrary File Deletion Vulnerability.

CVE advisoryKnown Exploit

CVE-2016-3715

The ImageMagick EPHEMERAL coder vulnerability allows for arbitrary file deletion via a crafted image. This impacts organizations using ImageMagick for image processing, posing a risk to system integrity and data availability. Organizations should identify affected systems and apply necessary updates.

3Halo Surface Signal

Redhat Enterprise Linux Desktop

6.07.06.77.27.37.47.57.67.76.0_s390x7.0_s390x6.7_s390x7.2_s390x7.3_s390x7.4_s390x7.5_s390x7.6_s390x7.7_s390x6.0_ppc647.0_ppc646.7_ppc647.2_ppc647.3_ppc64...

External exposure likelihood

Halo Surface Signal score for CVE-2016-3715

ImageMagick is a library used to process images. While typically invoked by internal applications or scripts, it is commonly integrated into web-facing services that accept and process user-supplied image uploads. Because the vulnerability is triggered by parsing crafted input rather than direct network interaction, public exposure is plausible depending on the specific application implementation.

Horizon Alert

Summary of the vulnerability and why it matters

ImageMagick's EPHEMERAL coder is vulnerable, allowing remote attackers to delete arbitrary files. This could impact system integrity and data availability for organizations utilizing this software for image processing. The vulnerability lies in the improper handling of crafted image files.

  • Vulnerable image processing feature
  • Flaw allows arbitrary file deletion
  • Risk of data loss and system disruption

Attack Path

How an attacker could exploit the issue

This vulnerability allows an attacker to delete arbitrary files on a system. The attack begins with a specially crafted image file. An attacker can then trick a user or a system process into processing this image file, leading to the deletion of files.

  • Exposure through file processing.
  • Attacker provides malicious image.
  • Resulting arbitrary file deletion.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in ImageMagick could allow for the deletion of arbitrary files on a system. An attacker could potentially exploit this by crafting a malicious image file that, when processed by an affected ImageMagick version, triggers the deletion. The impact on an organization could range from minor disruptions to significant data loss, depending on the files targeted and the system's configuration. Given the potential for file deletion, organizations should treat this as a matter requiring prompt attention.

  • Likely attacker skill level: Moderate
  • Required access or conditions: User interaction with a crafted image
  • Business risk or urgency: High

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability allows remote attackers to delete arbitrary files by crafting a specific image. Organizations should prioritize identifying systems that process images using ImageMagick to understand their exposure. Implementing vendor-provided security updates is crucial to remediate the risk.

  • Find systems processing images.
  • Reduce exposure or isolate risk.
  • Apply vendor fixes and verify.
  • Monitor for related activity.

Frequently asked questions

What is ImageMagick?

ImageMagick is a free, open-source software suite used for creating, editing, composing, and converting bitmap images. It supports over 200 file formats and is widely used in applications for tasks like web development, graphic design, and scientific research.

What is the CVE-2016-3715 vulnerability in ImageMagick?

CVE-2016-3715 is a vulnerability in ImageMagick's EPHEMERAL coder that allows remote attackers to delete arbitrary files by crafting a special image file. This is a weakness in access control, specifically CWE-20 (Improper Input Validation).

How can an attacker exploit the CVE-2016-3715 vulnerability?

An attacker can exploit this vulnerability by crafting a malicious image file. When processed by an application using ImageMagick or by the ImageMagick utilities themselves, this specially crafted image can trigger the EPHEMERAL coder to delete arbitrary files. This can be achieved using directory-traversal strings like '../' or by providing a full path name.

What is the relevance of CVE-2016-3715 for user-submitted images?

This vulnerability is particularly relevant for systems that process user-submitted images. Because ImageMagick is often integrated into web services that handle image uploads, an attacker could potentially upload a crafted image to delete files on the server, even if the system doesn't perform direct network interaction.

How can organizations mitigate the CVE-2016-3715 vulnerability?

To mitigate this vulnerability, it is recommended to update ImageMagick to a patched version. If updating is not immediately possible, a security policy file (e.g., policy.xml) can be configured to disable the vulnerable EPHEMERAL coder and other potentially risky coders. Verifying image file 'magic bytes' before processing is also advised.

References