The downloads manager in Opera before 11.01 on Windows does not properly determine the pathname of the filesystem-viewing application, which allows user-assisted remote attackers to execute arbitrary code via a crafted web site that hosts an executable file.

Opera reports :

Opera 11.01 is a recommended upgrade offering security and stability enhancements.

The following security vulnerabilities have been fixed :

- Removed support for 'javascript:' URLs in CSS -o-link values, to make it easier for sites to filter untrusted CSS.

- Fixed an issue where large form inputs could allow execution of arbitrary code, as reported by Jordi Chancel; see our advisory.

- Fixed an issue which made it possible to carry out clickjacking attacks against internal opera: URLs; see our advisory.

- Fixed issues which allowed web pages to gain limited access to files on the user's computer; see our advisory.

- Fixed an issue where email passwords were not immediately deleted when deleting private data; see our advisory.

The remote host is running the Opera web browser. 

Versions of Opera earlier than 11.01 are potentially affected by multiple vulnerabilities :

  - When certain large form inputs appear on a web page, they can lead to memory corruption which could be used to execute arbitrary code. (982)

  - It is possible to bypass restrictions on 'opera:' URLs to launch clickjacking attacks. (983)

  - Certain types of HTTP responses and redirections can cause Opera to mistakenly give elevated privileges to remote web pages. (984)

  - When using 'Delete Private Data' and selecting the option to 'Clear all email account passwords', the passwords are not deleted immediately and continue to be available until the browser is restarted. (986)

  - In certain cases, the wrong executable is used to display a downloaded file in its folder. (985)

The version of Opera installed on the remote Windows host is earlier than 11.01.  Such versions are potentially affected by the following issues :

  - The Cascading Style Sheets (CSS) Extensions for XML     implementation recognizes links to javascript: URLs in     the -o-link property, which could be abused to bypass     CSS filtering. (CVE-2011-0681)

  - An integer truncation error exists such that the     application may crash when accessing web pages that     contain forms having large numbers of items in an      'option' element. Such crashes may lead to memory     corruption and allow code execution. (982)

  - An error exists in the handling of internal 'opera:'     URLS that can allow anti-clickjacking configuration     options to be modified. (983)

  - An error exists in the processing of certain HTTP     requests and responses that can allow limited,     unauthorized access to local files. (984)

  - An error exists in the downloads manager that allows     unintended executables to be used when attempting to     open the folder containing a downloaded file. (985)

  - An error exists in the private data deletion process     that causes the removal of email passwords to be     delayed. (986)

ID	Name	Product	Family	Severity
51928	FreeBSD : opera -- multiple vulnerabilities (2eda0c54-34ab-11e0-8103-00215c6a37bb)	Nessus	FreeBSD Local Security Checks	high
5747	Opera < 11.01 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	high
51774	Opera < 11.01 Multiple Vulnerabilities	Nessus	Windows	high

Detections

Analytics

CVE-2011-0450

high

Tenable Plugins

high

high

high