Opera before 11.01 does not properly handle redirections and unspecified other HTTP responses, which allows remote web servers to obtain sufficient access to local files to use these files as page resources, and consequently obtain potentially sensitive information from the contents of the files, via an unknown response manipulation.

Opera 11.01 fixes several critical security bugs :

  - CVE-2011-0681: CVSS v2 Base Score: 4.3 (MEDIUM)     (AV:N/AC:M/Au:N/C:N/I:P/A:N): Other (CWE-Other)

  - CVE-2011-0682: CVSS v2 Base Score: 9.3 (HIGH)     (AV:N/AC:M/Au:N/C:C/I:C/A:C): Buffer Errors (CWE-119)

  - CVE-2011-0683: CVSS v2 Base Score: 4.3 (MEDIUM)     (AV:N/AC:M/Au:N/C:N/I:P/A:N): Other (CWE-Other)

  - CVE-2011-0684: CVSS v2 Base Score: 7.8 (HIGH)     (AV:N/AC:L/Au:N/C:C/I:N/A:N): Input Validation (CWE-20)

  - CVE-2011-0685: CVSS v2 Base Score: 3.6 (LOW)     (AV:L/AC:L/Au:N/C:P/I:P/A:N): Input Validation (CWE-20)

  - CVE-2011-0686: CVSS v2 Base Score: 5.0 (MEDIUM)     (AV:N/AC:L/Au:N/C:N/I:N/A:P): Insufficient Information     (CWE-noinfo)

  - CVE-2011-0687: CVSS v2 Base Score: 4.3 (MEDIUM)     (AV:N/AC:M/Au:N/C:N/I:N/A:P): Input Validation (CWE-20)

The remote host is affected by the vulnerability described in GLSA-201206-03 (Opera: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Opera. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could entice a user to open a specially crafted web       page, possibly resulting in execution of arbitrary code with the       privileges of the process or a Denial of Service condition. A remote       attacker may be able to: trick users into downloading and executing       arbitrary files, bypass intended access restrictions, spoof trusted       content, spoof URLs, bypass the Same Origin Policy, obtain sensitive       information, force subscriptions to arbitrary feeds, bypass the popup       blocker, bypass CSS filtering, conduct cross-site scripting attacks, or       have other unknown impact.
    A local attacker could perform symlink attacks to overwrite arbitrary       files with the privileges of the user running the application or possibly       obtain sensitive information.
    A physically proximate attacker may be able to access an email account.
  Workaround :

    There is no known workaround at this time.

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 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
75694	openSUSE Security Update : opera (openSUSE-SU-2011:0103-1)	Nessus	SuSE Local Security Checks	high
59631	GLSA-201206-03 : Opera: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
53787	openSUSE Security Update : opera (openSUSE-SU-2011:0103-1)	Nessus	SuSE Local Security Checks	high
51928	FreeBSD : opera -- multiple vulnerabilities (2eda0c54-34ab-11e0-8103-00215c6a37bb)	Nessus	FreeBSD Local Security Checks	high
800855	Opera < 11.01 Multiple Vulnerabilities	Log Correlation Engine	Web Clients	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-2011-0684

high

Tenable Plugins

high

critical

high

high

high

high

high