CIS CYBER SECURITY ADVISORIES
MS-ISAC CYBER SECURITY ADVISORY NUMBER:
Multiple Vulnerabilities in Adobe Flash Player Could Allow For Remote Code Execution (APSB11-28)
Multiple vulnerabilities have been discovered in Adobe Flash Player that could allow attackers to take complete control of affected systems. Adobe Flash Player is a widely distributed multimedia and application player used to enhance the user experience when visiting web pages or reading email messages. Successful exploitation could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Failed exploit attempts will likely cause denial-of-service conditions.
- Adobe Flash Player 18.104.22.168 and earlier versions for Windows, Macintosh, Linux and Solaris
- Adobe Flash Player for Android 22.214.171.124 and earlier versions
- Adobe AIR 3.0 and earlier versions for Windows, Macintosh, and Android
- Large and medium government entities: High
- Small government entities: High
- Large and medium business entities: High
- Small business entities: High
Home users: High
Adobe Flash Player is prone to multiple vulnerabilities that could allow for remote code execution. Details of these vulnerabilities are as follows:
- Eight memory corruption vulnerabilities which could allow for remote code execution
- A heap corruption vulnerability which could lead to code execution
- A buffer overflow vulnerability which could lead to code execution
- A stack overflow vulnerability which could lead to code execution
- A cross-domain policy bypass vulnerability
These vulnerabilities may be exploited if a user opens a specially crafted Adobe Flash file. Successful exploitation could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Failed exploit attempts will likely cause denial-of-service conditions.
We recommend the following actions be taken:
- Install the updates provided by Adobe immediately after appropriate testing.
- Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
- Do not open email attachments or click on URLs from unknown or untrusted sources.
- Inform and educate users regarding the threats posed by hypertext links contained in emails, IM (Instant Messages) or attachments especially from un-trusted sources.
- Consider implementing file extension whitelists for allowed e-mail attachments.