External risk intelligence

Adobe Flash Player Code Execution Vulnerability

CVE advisoryKnown Exploit

CVE-2015-5123

A vulnerability in Adobe Flash Player could permit attackers to execute code or disrupt services through malicious content. Organizations utilizing this software face a business risk of unauthorized code execution or denial of service. The affected product is end-of-life and should be disconnected.

1Halo Surface Signal

Use After Free

Redhat Enterprise Linux Desktop

5.06.06.611.4111211.0 to 11.2.202.48113.0 to 13.0.0.30218.0 to 18.0.0.203

External exposure likelihood

Halo Surface Signal score for CVE-2015-5123

This vulnerability affects Adobe Flash Player, a client-side browser plugin. While it involves processing untrusted content, it is not an internet-facing service, gateway, or management interface. Its deployment is tied to individual end-user workstations and browsers, which falls outside the definition of public-facing infrastructure for the purposes of this scoring.

Horizon Alert

Summary of the vulnerability and why it matters

The Adobe Flash Player contains a flaw within its BitmapData class. This weakness allows for memory corruption. The potential business impact includes attackers executing arbitrary code or causing denial of service.

  • Vulnerable component: Adobe Flash Player
  • Core weakness: Memory corruption
  • Main business impact: Code execution or denial of service

Attack Path

How an attacker could exploit the issue

This vulnerability allows attackers to execute arbitrary code or cause a denial of service by corrupting memory. It is triggered by crafted Flash content that overrides a specific function within the Adobe Flash Player. The exploitation of this vulnerability can lead to unauthorized code execution or system instability.

  • Crafted Flash content is delivered.
  • Attacker gains system control.
  • Memory corruption occurs.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Adobe Flash Player could allow attackers to execute arbitrary code or cause denial-of-service through malicious Flash content. The issue stems from a use-after-free flaw within the BitmapData class. Exploitation in the wild has been documented.

  • Likely attacker skill level: Unknown, but often sophisticated.
  • Required access or conditions: User must interact with malicious Flash content.
  • Business risk or urgency: High, as it allows code execution.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Adobe Flash Player could allow attackers to execute arbitrary code or cause a denial of service by exploiting memory corruption. The affected product is end-of-life, and organizations should disconnect it if it is still in use. Further investigation into specific asset inventories is recommended to understand the scope of potential exposure.

  • Find affected systems and installations.
  • Disconnect obsolete software.
  • Verify software removal.

Frequently asked questions

What is Adobe Flash Player and its primary use in web browsing?

Adobe Flash Player was a browser plugin that enabled rich web content like animations, games, and video playback. It was extensively used for interactive website elements before its discontinuation.

How does the CVE-2015-5123 vulnerability enable code execution?

CVE-2015-5123 is a use-after-free vulnerability. This occurs when software attempts to access memory after it has been deallocated, causing memory corruption that attackers can exploit to run arbitrary code or cause a denial of service.

What specific weakness class is associated with CVE-2015-5123?

The weakness class associated with CVE-2015-5123 is CWE-416, which describes a use-after-free vulnerability.

What actions could trigger this Adobe Flash Player vulnerability, and what is the potential scope?

Attackers can trigger this vulnerability by providing crafted Flash content that overrides a valueOf function. The scope is defined by the user's interaction with this malicious content, potentially leading to code execution or denial of service on the affected system.

What is the recommended response for systems affected by Adobe Flash Player vulnerabilities like CVE-2015-5123?

Since Adobe Flash Player is end-of-life, the primary response is to disconnect any systems still using it. Organizations should identify and remove all instances of the software to mitigate risks.

References