Opera before 11.00, when Opera Turbo is enabled, does not display a page's security indication, which makes it easier for remote attackers to spoof trusted content via a crafted web site.

opera 11.00 fixes among other things several security vulnerabilities.
Please refer opera's site for more information:
http://www.opera.com/docs/changelogs/unix/1100/

(CVE-2010-4508, CVE-2010-4579, CVE-2010-4580, CVE-2010-4581, CVE-2010-4582, CVE-2010-4583, CVE-2010-4584, CVE-2010-4585, CVE-2010-4586)

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.

The remote host is running the Opera web browser.

Versions of Opera earlier than 11.00 are potentially affected by multiple vulnerabilities :

  - An error exists such that web page content can be displayed over dialog boxes leading to security warning misrepresentation. (977)

  - An error exists such that WAP form contents can be leaded to third-party sites. (979)

  - Two unspecified, high-severity vulnerabilities exists.

The version of Opera installed on the remote host is earlier than 11.00.  Such versions are potentially affected by the following issues :

  - An error exists such that web page content can be     displayed over dialog boxes leading to security     warning misrepresentation. (977, CVE-2010-4579)

  - An error exists such that WAP form contents can be     leaked to third-party sites. (979, CVE-2010-4580)

  - An unspecified high severity issue with unknown     impact exists. (CVE-2010-4581)

  - An error exists in the handling of security policies     during extension updates. (CVE-2010-4582)

  - An error exists when 'Opera Turbo' is enabled that     does not display a page's security information     correctly. (CVE-2010-4583)

  - An error exists when viewing sites over HTTPS such that     problems with X.509 certificates are not displayed     properly. (CVE-2010-4584)

  - An error exists in the automatic update functionality     that allows an attacker to cause a denial of service     by crashing the application. (CVE-2010-4585)

  - The 'WebSockets' implementation contains unspecified     errors with unknown impact. (CVE-2010-4586)

  - An error exists in the implementation of the 'Insecure     Third Party Module' warning messages that results in an     unspecified vulnerability. (CVE-2010-4587)

ID	Name	Product	Family	Severity
75693	openSUSE Security Update : opera (openSUSE-SU-2010:1094-1)	Nessus	SuSE Local Security Checks	critical
59631	GLSA-201206-03 : Opera: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
53786	openSUSE Security Update : opera (openSUSE-SU-2010:1094-1)	Nessus	SuSE Local Security Checks	critical
53686	openSUSE Security Update : opera (openSUSE-SU-2010:1094-1)	Nessus	SuSE Local Security Checks	critical
5735	Opera < 11.00 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	medium
51343	Opera < 11 Multiple Vulnerabilities	Nessus	Windows	high

Detections

Analytics

CVE-2010-4583

medium

Tenable Plugins

critical

critical

critical

critical

medium

high