Malicious setRequestHeader cross-site vulnerability – Opera Security Advisories

Malicious setRequestHeader cross-site vulnerability – Opera Security Advisories OPCOM Team | September 29, 2005 Summary A malicious setRequestHeader can be used to stealuser credentials and inject cross-site JavaScript. Severity: high Opera’s response Since version 8.02 of Opera, double newlineso...

Update your browser: Security fixes for latest Chrome zero-day

News, Security Update your browser: Security fixes for latest Chrome zero-day Share August 23rd, 2024 Hi everyone! The latest patches to the Opera and Opera GX address several recent vulnerabilities, including a zero-day exploit CVE-2024-7971. We recommend updating your browsers to the latest...

Opera becomes part of the CNA program

News Opera becomes part of the CNA program Share December 13th, 2019 Usually, Friday the 13th is considered to be an unlucky day. However, this is not the case for Opera, as we have great news, especially for security researchers and all security-minded Opera fans. We are proud to announce that...

Flow is seamless and secure – security features explained

Security Flow is seamless and secure – security features explained Share August 28th, 2018 Some of you may already be familiar with Flow, the new feature that allows you to quickly and seamlessly share images, links and videos between your Opera browser for computers and your Opera Touch mobile...

Dealing with FREAK and SuperFish

Security Dealing with FREAK and SuperFish Share March 10th, 2015 The FREAK TLS attack Following the trend of memorable names for TLS attacks, FREAK was recently announced. This exploits a bug in some TLS libraries, combined with the support of ancient weak ciphers, to enable a MitM to force...

Thanks to the researchers 2015

Research Thanks to the researchers 2015 Share January 16th, 2015 At Opera Software, we run a large number of websites for our products and services, and we like to give credit to the researchers and website testers who offer their assistance to help us tighten the security of those websites. We...

DOM events manipulation might be used to execute arbitrary code – Opera Security Advisories

DOM events manipulation might be used to execute arbitrary code – Opera Security Advisories OPCOM Team | January 29, 2013 Severity: High Description: Particular DOM event manipulations can cause Opera to crash. In some cases, this crash might occur in a way that allows execution of arbitrary code...

Use of SVG clipPaths can allow execution of arbitrary code – Opera Security Advisories

When SVG documents with specifically prepared clipPaths are used in Opera, Opera may allow other content to overwrite the memory, before referencing the memory, which will lead to a crash. If an attacker can control the contents being written into memory, execution of arbitrary code may occur...

Truncated dialogs may be used to trick users – Opera Security Advisories

When an important dialog is being displayed, such as a download dialog, the entire dialog should be visible, so that the user can clearly see what the dialog’s buttons will do. In some cases, specific user interactions can cause Opera not to enforce this correctly, allowing the window to become...

Element HTML content can be incorrectly returned without escaping, bypassing some HTML sanitizers – Opera Security Advisories

When sites accept HTML from untrusted users, and use that HTML as page content, they typically sanitize the untrusted HTML to ensure that it does not contain any harmful content, such as malicious scripts. In some cases, this sanitization may be performed by writing and reading the contents of DO...

Certain characters in HTML can incorrectly be ignored, which can facilitate XSS attacks – Opera Security Advisories

Sites that allow content to be provided by untrusted users, such as forums and blogging sites, typically sanitize the untrusted content to ensure that it does not contain any harmful content, such as malicious scripts. When certain characters appear at specific locations within HTML markup, they...

Certain URL constructs can allow arbitrary code execution – Opera Security Advisories

Certain page address URL constructs can cause Opera to allocate the wrong amount of memory for storing the address. When it then attempts to store the address, it will overwrite unrelated memory with attacker-controlled data. This can lead to a crash, which may also execute that data as code...

History.state can leak the state data from cross domain pages – Opera Security Advisories

When a site uses history.pushState and history.replaceState to add or replace history entries, it can also provide optional data, which may typically be used to restore the given state when the user navigates through their browser history. When pages with cross-domain frames use this functionalit...

Web page content may overlap the address field – Opera Security Advisories

The browser’s user interface contains several pieces of security information. To preserve this information correctly, web page content should not be able to display over the user interface. Certain styling can cause Opera to allow the content to be displayed outside the page, over the address...

Web pages can gain limited access to files on the user’s computer – Opera Security Advisories

Web pages can gain limited access to files on the user’s computer – Opera Security Advisories OPCOM Team | January 25, 2011 Severity High Description Certain types of HTTP responses and redirections can cause Opera to mistakenly give elevated privileges to remote web pages. These pages can then u...

HTTP Content-Length header can be used to execute arbitrary code – Opera Security Advisories

HTTP Content-Length header can be used to execute arbitrary code – Opera Security Advisories OPCOM Team | March 17, 2010 Affected versions This vulnerability affects Opera for Microsoft Windows. Severity Highly Severe Description Large values in the HTTP Content-Length header can cause Opera to...

Web fonts can be used to spoof the page address – Opera Security Advisories

In some cases, a Web font intended to be used for page content could be incorrectly used by Opera to render parts of the user interface, including the address field. This can be used by a malicious site to display a false domain name in the address field...

Random number generator and input name linebreaks can be used to send custom data to other sites – Opera Security Advisories

Random number generator and input name linebreaks can be used to send custom data to other sites – Opera Security Advisories OPCOM Team | June 10, 2009 Severity Moderately severe Problem description Input names can contain line breaks when data is sent using POST. Suitable use of the random numbe...

The links panel can allow cross-site scripting – Opera Security Advisories

The links panel can allow cross-site scripting – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Highly Severe Problem Description The links panel shows links in all frames on the current page, including links with JavaScript URLs. When a page is held in a frame, the script is...

Newsfeed prompt can cause Opera to execute arbitrary code – Opera Security Advisories

Newsfeed prompt can cause Opera to execute arbitrary code – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Highly Severe Problem Description When Opera encounters a newsfeed source on a Web page, it prompts to add the source as a newsfeed. A script can manipulate the feed sourc...

Java applets can be used to read sensitive information – Opera Security Advisories

Java applets can be used to read sensitive information – Opera Security Advisories OPCOM Team | December 16, 2008 Severity: Highly Severe Problem Description Once a Java applet has been cached, if a page can predict the cache path for that applet, it can load the applet from the cache, causing it...

Sites can change framed content on other sites – Opera Security Advisories

Sites can change framed content on other sites – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Highly Severe Problem Description Scripts are able to change the addresses of framed pages that come from the same site. Due to a flaw in the way that Opera checks what frames can be...

Feed links can link to local files

As a security precaution, Opera does not allow Web pages to link to files on the user's local disk. However, a flaw exists that allows Web pages to link to feed source files on the user's computer. Suitable detection of JavaScript events and appropriate manipulation can unreliably allow a script ...

Long hostnames in file: URLs can cause execution of arbitrary code

Exceptionally long host names in file: URLs can cause a buffer overflow, which may be exploited to execute arbitrary code. Remote Web pages cannot refer to file: URLs, so successful exploitation involves tricking users into manually opening the exploit URL, or a local file that refers to it...

External news readers and e-mail clients can be used to execute arbitrary code – Opera Security Advisories

External news readers and e-mail clients can be used to execute arbitrary code – Opera Security Advisories OPCOM Team | October 16, 2007 External news readers and e-mail clients can be used to execute arbitrary code. Severity: Highly Severe Affected Versions All versions of Opera for Desktop prio...

A very large href attribute value in HTML can crash Opera – Opera Security Advisories

A very large href attribute value in HTML can crash Opera – Opera Security Advisories OPCOM Team | September 5, 2006 Summary A very large href attribute value in a Web page can crash Opera. Severity: Not a security issue Problem description A Web page containing a very large href attribute value...

Opera Privacy Statement Update 2022

Privacy Opera Privacy Statement Update 2022 Share August 29th, 2022 Opera, a browser company based out of Oslo, Norway, cares deeply about user security and data protection. With that in mind, we actively work on improving our internal practices and communications with you, our users. We are maki...

Bug Bounty Adventures: A NodeBB 0-day

Research Bug Bounty Adventures: A NodeBB 0-day Share March 25th, 2022 Opera maintains both apublic bug bounty program, and a private program, where security researchers can submit security issues they have found in Opera’s products for cash rewards. We like to highlight some of the issues that ha...

$8,000 Bug Bounty Highlight: XSS to RCE in the Opera Browser

Research $8,000 Bug Bounty Highlight: XSS to RCE in the Opera Browser Share September 24th, 2021 Continuing from hisprevious post, Bug Bounty Hunter Renwa writes about the second vulnerability he submitted to Opera’s Private Bug Bounty Programme: a Remote Code Execution in Opera’s My Flow Feature...

How private is a private window?

Privacy How private is a private window? Share October 15th, 2020 Alice and Bob find themselves in a shared living-space, where long-held secrets are at risk of being revealed. TL;DR: skip to the conclusions to see what Alice learned. The Privacy Problem Alice and Bob recently decided to take the...

Opera mitigates critical CPU vulnerabilities

Security Opera mitigates critical CPU vulnerabilities Share January 4th, 2018 There is a lot of uncertainty right now about the impact of the hardware security issue named Meltdown. There will be a scheduled release of Opera which will contain a first set of workarounds as soon as the browser is...

DLL hijacking and the Opera browser

Security DLL hijacking and the Opera browser Share March 10th, 2017 Recently, a collection of documents was released online, which was claimed to have originated with a major World power. The documents listed hacking vectors that could be used to inject code into major operating systems and...

Security changes in Opera 21

News Security changes in Opera 21 Share May 6th, 2014 Opera 21 for Windows and Mac is now out on the Stable channel. As with most major releases, the main focus is on the new features, which are discussed over on the Desktop Team blog. In addition, we have included a reworking of the Address fiel...

RC4 encryption protocol is vulnerable to certain brute force attacks – Opera Security Advisories

Weaknesses in the RC4 encryption protocol have been found, allowing an attacker to deduce the plaintext. If the same message is encrypted many millions of times, statistical methods can be used to extract valuable information, such as cookies. Due to the time this amount of requests takes, this i...

Carefully timed redirects can allow cross site scripting – Opera Security Advisories

Scripts on a page are supposed to be restricted so that they can only interact with other pages from the same domain and security context. Carefully timed redirects can cause scripts to execute in the wrong security context in Opera. This allows cross site scripting XSS...

Hidden keyboard navigation can allow cross site scripting or code execution – Opera Security Advisories

When a user is interacting with a window, that window should be visible to the user, to ensure that the user realizes it is there. If a page is displayed in a small enough window, the user may not realize it is being displayed, and if the right keyboard sequence is carefully followed, they can en...

Clickjacking attacks may be carried out against internal opera: URLs – Opera Security Advisories

Clickjacking attacks may be carried out against internal opera: URLs – Opera Security Advisories OPCOM Team | January 25, 2011 Severity High Description Internal opera: URLs which may be used to modify the Opera configuration have some intentional restrictions that are designed to mitigate possib...

Cross-domain checks may be bypassed, allowing limited data theft using CSS – Opera Security Advisories

Cross-domain checks may be bypassed, allowing limited data theft using CSS – Opera Security Advisories OPCOM Team | October 6, 2010 Severity Moderate Description CSS can be loaded cross-domain. In some cases, files that do not contain CSS may be partially interpreted as CSS. It is possible to mak...

Heap buffer overflow in HTML5 canvas can be used to execute arbitrary code – Opera Security Advisories

Heap buffer overflow in HTML5 canvas can be used to execute arbitrary code – Opera Security Advisories OPCOM Team | August 12, 2010 Severity High Description Performing some painting operations on a canvas while certain transformations are being applied in Opera may result in heap buffer overflow...

Feed preview can reveal contents of unrelated news feeds – Opera Security Advisories

Feed preview can reveal contents of unrelated news feeds – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Highly Severe Platforms All desktop versions Problem Description When Opera is previewing a news feed, some scripts are not correctly blocked. These scripts are able to...

Malformed JPEG headers can be used to execute arbitrary code – Opera Security Advisories

Malformed JPEG headers can be used to execute arbitrary code – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Extremely Severe Problem Description A specially crafted JPEG header can cause Opera to crash, allowing execution of arbitrary code. Opera’s Response Opera Software has...

Manipulating text input contents can allow execution of arbitrary code – Opera Security Advisories

Manipulating text input contents can allow execution of arbitrary code – Opera Security Advisories OPCOM Team | December 15, 2008 Severity Extremely Severe Problem Description Manipulating certain text-area contents can cause a buffer overflow, which may be exploited to execute arbitrary code...

Certain characters can obscure the page address – Opera Security Advisories

Certain characters can obscure the page address – Opera Security Advisories OPCOM Team | June 9, 2008 Severity: Less Severe Problem Description When a page address contains certain characters, they can cause the page address text to be misplaced. In some cases, this could make characters be...

Opera Receives DevSecOps All-Star Award at SnykCon 2020

News Opera Receives DevSecOps All-Star Award at SnykCon 2020 Share October 28th, 2020 AtSnykCon 2020, Opera received the DevSecOps All-Star Award for leveraging Snyk to bring a complete and fully automated DevSecOps process into a secure software development lifecycle. Opera was represented by...

Bypass a restriction in OfA 54 – Opera Security Advisories

Opera for Android before 54.0.2669.49432 is vulnerable to a sandboxed cross-origin iframe bypass attack. By using a service working inside a sandboxed iframe it is possible to bypass the normal sandboxing attributes. This allows an attacker to make forced redirections without any user interaction...

Opera 12 and Opera Mail security update

Security Opera 12 and Opera Mail security update Share February 16th, 2016 We realize that those of you on old operating systems like Windows XP SP1 and older are left without much choice beyond using our Presto-based browser. With security standards on the web changing so much we didn’t want to...

Malformed GIF images could allow execution of arbitrary code – Opera Security Advisories

When loading GIF images into memory, Opera should allocate the correct amount of memory to store that image. Specially crafted image files can cause Opera to allocate the wrong amount of memory. Subsequent data may then overwrite unrelated memory with attacker-controlled data. This can lead to a...

Small windows can be used in several ways to trick users into executing downloads – Opera Security Advisories

When the download dialog is displayed, it should always be visible to the user, to ensure that the user realizes it is there. If the dialog is displayed in a small enough window, the user may not realize it is being displayed, and if the right keyboard sequence is carefully followed, they can end...

Carefully timed reloads, redirects, and navigation can spoof the address field – Opera Security Advisories

The address field should always show the address of the page that is being displayed. Certain types of navigation, combined with reloads and redirects to a slowly-responding target site can cause the address field to show the target site’s address, while the attacking site is still being displaye...

Web page content can display misleading security information – Opera Security Advisories

Dialogs such as the security information dialog and download dialog are displayed over the top of the webpage content. In some cases, webpage content will be incorrectly displayed on top of the dialogs, or over parts of the dialogs. This content can then display misleading security information,...