CIS CYBER SECURITY ADVISORIES

MS-ISAC CYBER SECURITY ADVISORY NUMBER:
2011-034

DATE(S) ISSUED:
05/13/2011

SUBJECT:
Multiple Vulnerabilities in Adobe Flash Player Could Allow For Remote Code Execution (APSB11-12)

OVERVIEW:

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.

One of these vulnerabilities may be exploited if a user opens a Microsoft Word or Microsoft Excel document containing an embedded, specially crafted Adobe Flash file, which may be sent as an email attachment. Adobe is reporting that there is malware attempting to exploit this vulnerability.

SYSTEMS AFFECTED:

  • AdobeFlash Player 10.2.159.1 and earlier versions for Windows, Macintosh, Linux and Solaris operating systems.
  • AdobeFlash Player 10.2.154.28 and earlier for Chrome users.
  • AdobeFlash Player 10.2.157.51 and earlier for Android.

RISK:
Government:

  • Large and medium government entities: High
  • Small government entities: High

Businesses:

  • Large and medium business entities: High
  • Small business entities: High

Home users: High

DESCRIPTION:
AdobeFlash Player is prone to multiple vulnerabilities that could allow for remote code execution. Details of these vulnerabilities are as follows:

  • A design flaw that could lead to information disclosure;
  • An integer overflow vulnerability that could lead to code execution;
  • Five vulnerabilities involving memory corruption that could lead to code execution; and
  • Four bounds checking vulnerabilities that could lead to code execution.


There have been reports indicating active exploitation of one of the vulnerabilities (CVE-2011-0627) that can be exploited by opening a Microsoft Word (.doc) or Microsoft Excel(.xls) file sent as an email attachment and embedded with a specially crafted Flash (.swf) 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.

RECOMMENDATIONS:
We recommend the following actions be taken:

  • Install the update from 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.
  • Consider installing and running Adobe Reader X in Protected Mode.
  • Do not open email attachments from unknown or untrusted sources.
  • Consider implementing file extension whitelists for allowed e-mail attachments.


REFERENCES:
Adobe:
http://www.adobe.com/support/security/bulletins/apsb11-12.html

SecurityFocus:
http://www.securityfocus.com/bid/46202
http://www.securityfocus.com/bid/47806
http://www.securityfocus.com/bid/47807
http://www.securityfocus.com/bid/47808
http://www.securityfocus.com/bid/47809
http://www.securityfocus.com/bid/47810
http://www.securityfocus.com/bid/47811
http://www.securityfocus.com/bid/47812
http://www.securityfocus.com/bid/47813
http://www.securityfocus.com/bid/47814
http://www.securityfocus.com/bid/47815

CVE:
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0589
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0618
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0619
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0620
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0621
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0622
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0623
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0624
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0625
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0626
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0627