Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Analytics

Vulnerability Crosses Browser Boundaries

A newly-reported flaw makes Internet Explorer and Mozilla browsers equally vulnerable

A security researcher has found a flaw in browser scripting that could open a range of products to file stealers.

Charles McCauley, an independent researcher, on Tuesday published proof-of-concept code that demonstrates how attackers could lure users into entering text into a seemingly secure electronic form, only to have the data stolen as they type.

A report from the French Security Incident Reporting Team (FrSIRT) describes the possible scenario: "This flaw could be exploited by remote attackers to trick users into uploading arbitrary files from a vulnerable or malicious host by convincing them to visit a specially-crafted Web page and perform certain actions (e.g. type into a text field) that will cause an arbitrary file to be inadvertently uploaded."

Attackers could use the flaw to steal the directory path of secure files and then upload them, according to the vulnerability reports.

The exploit is unusual because it takes advantage of a flaw that exists in both JavaScript, which is used by four Mozilla browsers, and Active Scripting, which is used in Internet Explorer. Both tools contain a design error that lets a script cancel certain keystroke events when users are entering text, and this error can be repurposed to let the attacker steal the user's keystrokes, McCauley reports.

Any browser that uses JavaScript or Active Scripting, including current and beta versions of IE as well as Mozilla's Firefox for Windows, Linux, and Mac OS X, and its next-generation SeaMonkey, are vulnerable.

Most vulnerability reports have listed the threat as medium to moderate, since a user would have to type a great deal of text into the field in order to reveal secure directory information. For example, the user would have to type the entire data path to a file before the attacker could access the directory.

Neither Microsoft nor Mozilla has issued a patch for the bug.

— Tim Wilson, Site Editor, Dark Reading

Organizations mentioned in this story

  • Microsoft Corp. (Nasdaq: MSFT)
  • Mozilla

    Tim Wilson is Editor in Chief and co-founder of Dark Reading.com, UBM Tech's online community for information security professionals. He is responsible for managing the site, assigning and editing content, and writing breaking news stories. Wilson has been recognized as one ... View Full Bio

    Comment  | 
    Print  | 
    More Insights
  • Comments
    Newest First  |  Oldest First  |  Threaded View
    COVID-19: Latest Security News & Commentary
    Dark Reading Staff 5/22/2020
    How an Industry Consortium Can Reinvent Security Solution Testing
    Henry Harrison, Co-founder & Chief Technology Officer, Garrison,  5/21/2020
    Is Zero Trust the Best Answer to the COVID-19 Lockdown?
    Dan Blum, Cybersecurity & Risk Management Strategist,  5/20/2020
    Register for Dark Reading Newsletters
    White Papers
    Video
    Cartoon Contest
    Write a Caption, Win a Starbucks Card! Click Here
    Latest Comment: This comment is waiting for review by our moderators.
    Current Issue
    How Cybersecurity Incident Response Programs Work (and Why Some Don't)
    This Tech Digest takes a look at the vital role cybersecurity incident response (IR) plays in managing cyber-risk within organizations. Download the Tech Digest today to find out how well-planned IR programs can detect intrusions, contain breaches, and help an organization restore normal operations.
    Flash Poll
    Twitter Feed
    Dark Reading - Bug Report
    Bug Report
    Enterprise Vulnerabilities
    From DHS/US-CERT's National Vulnerability Database
    CVE-2020-13485
    PUBLISHED: 2020-05-25
    The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.
    CVE-2020-13486
    PUBLISHED: 2020-05-25
    The Knock Knock plugin before 1.2.8 for Craft CMS allows malicious redirection.
    CVE-2020-13482
    PUBLISHED: 2020-05-25
    EM-HTTP-Request 1.1.5 uses the library eventmachine in an insecure way that allows an attacker to perform a man-in-the-middle attack against users of the library. The hostname in a TLS server certificate is not verified.
    CVE-2020-13458
    PUBLISHED: 2020-05-25
    An issue was discovered in the Image Resizer plugin before 2.0.9 for Craft CMS. There are CSRF issues with the log-clear controller action.
    CVE-2020-13459
    PUBLISHED: 2020-05-25
    An issue was discovered in the Image Resizer plugin before 2.0.9 for Craft CMS. There is stored XSS in the Bulk Resize action.