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
    Edge-DRsplash-10-edge-articles
    7 Old IT Things Every New InfoSec Pro Should Know
    Joan Goodchild, Staff Editor,  4/20/2021
    News
    Cloud-Native Businesses Struggle With Security
    Robert Lemos, Contributing Writer,  5/6/2021
    Commentary
    Defending Against Web Scraping Attacks
    Rob Simon, Principal Security Consultant at TrustedSec,  5/7/2021
    Register for Dark Reading Newsletters
    White Papers
    Video
    Cartoon
    Current Issue
    2021 Top Enterprise IT Trends
    We've identified the key trends that are poised to impact the IT landscape in 2021. Find out why they're important and how they will affect you today!
    Flash Poll
    How Enterprises are Developing Secure Applications
    How Enterprises are Developing Secure Applications
    Recent breaches of third-party apps are driving many organizations to think harder about the security of their off-the-shelf software as they continue to move left in secure software development practices.
    Twitter Feed
    Dark Reading - Bug Report
    Bug Report
    Enterprise Vulnerabilities
    From DHS/US-CERT's National Vulnerability Database
    CVE-2020-16632
    PUBLISHED: 2021-05-15
    A XSS Vulnerability in /uploads/dede/action_search.php in DedeCMS V5.7 SP2 allows an authenticated user to execute remote arbitrary code via the keyword parameter.
    CVE-2021-32073
    PUBLISHED: 2021-05-15
    DedeCMS V5.7 SP2 contains a CSRF vulnerability that allows a remote attacker to send a malicious request to to the web manager allowing remote code execution.
    CVE-2021-33033
    PUBLISHED: 2021-05-14
    The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.
    CVE-2021-33034
    PUBLISHED: 2021-05-14
    In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value.
    CVE-2019-25044
    PUBLISHED: 2021-05-14
    The block subsystem in the Linux kernel before 5.2 has a use-after-free that can lead to arbitrary code execution in the kernel context and privilege escalation, aka CID-c3e2219216c9. This is related to blk_mq_free_rqs and blk_cleanup_queue.