Initial Publication Date: Advisory Status: Advisory Severity: CVSS Base Score:Legacy ID
20 Jul 2012 Closed Medium 5.39 SYM12-012
Backup Exec System Recovery 2010 and Symantec System Recovery 2011 are susceptible to potential dll loading due to improper path restrictions in system file directories. Successful exploitation could result in an attacker being able to execute arbitrary code with logged-in user permissions.
Backup Exec System Recovery 2010
Upgrade to Backup Exec System Recovery 2010 SP5
Symantec System Recovery 2011
Upgrade to Symantec System Recovery 2011 SP2
CVSS2 Base Score
DLL Loading Remote Code Execution - Medium
dll loading command execution
Symantec was notified of potential dll loading due to improper path restrictions in file directories installed with Backup Exec System Recovery 2010 and Symantec System Recovery 2011. The Granular Restore Option directory and the Recovery Point Browser directory do not properly restrict the loading of external libraries. An unauthorized local user with access to the system could potentially insert a specifically-crafted file in one of the susceptible directory. An attacker with access to the network would then need to entice an authorized user to load a specifically formatted file from an alternate file location or network share. Successful exploitation could allow unauthorized arbitrary code to be executed with logged-on user permissions.
Symantec product engineers verified that the vulnerability exists in the versions of Backup Exec System Recovery and Symantec System Recovery indicated above. Additionally,Symantec engineers reviewed related functionality to further enhance overall product security.
Symantec has determined that one of the affected files indentified as a vector for the issue reported in the Granular Restore Library, "imapi.dll" is not a file that Symantec ships and installs with either Backup Exec System Recovery 2010 or Symantec System Recovery 2011. The Symantec products make use of the imapi.dll version installed with the underlying operating system.
NOTE: Symantec research determined that the presence of an older version of the imapi.dll could potentially be leveraged in this type of attack on the Granular Restore Library. Microsoft upgraded the original imapi.dll to imapiv2 with shipping versions of Windows Vista and Windows 7. Microsoft released Microsoft Hotfix932716, http://support.microsoft.com/kb/932716, to upgrade imapi to imapiv2 for Windows XP SP2/SP3 and Windows Server 2003.
Customers should ensure that they upgrade to the Backup Exec System Recovery 2010 SP5 or Symantec System Recovery 2011 SP2 updates indicated above. Customers should also ensure Microsoft Hotfix 932716has been successfully applied on their operating system.
Symantec knows of no exploitation of or adverse customer impact from this issue.
Customers may obtain Backup Exec System Recovery 2010 SP5 or Symantec System Recovery 2011 SP2 through their normal support/download locations.
As a part of normal best practices, Symantec strongly recommends:
Restrict access to administration or management systems to privileged users.
Restrict remote access, if required, to trusted/authorized systems only.
Run under the principle of least privilege where possible to limit the impact of exploit by threats.
Keep all operating systems and applications updated with the latest vendor patches.
Follow a multi-layered approach to security. Run both firewall and anti-malware applications, at a minimum, to provide multiple points of detection and protection to both inbound and outbound threats.
Deploy network and host-based intrusion detection systems to monitor network traffic for signs of anomalous or suspicious activity. This may aid in detection of attacks or malicious activity related to exploitation of latent vulnerabilities
Symantec credits Nenad Stojanovski, for identifying this and working with us while Symantec resolved the issue.
BID:Security Focus, http://www.securityfocus.com, has assigned a Bugtraq IDs (BIDs) to the issue for inclusion in the Security Focus vulnerability database.
CVE:The issue is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.
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