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    CVE-2017-7791

    On pages containing an iframe, the "data:" protocol can be used to create a modal alert that will render over arbitrary domains following page navigation, spoofing of the origin of the modal alert from the iframe content. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

    Published:Aug 8, 2017
    Last Modified:Nov 25, 2025
    EPS:Jun 11, 2018
    EPSS Score:0.01355
    CVSS Score:5.3

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Server Aus
    Vendor
    Redhat
    Product
    Enterprise Linux Server Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation

    Exploits

    https://bugzilla.mozilla.org/show_bug.cgi?id=1365875https://bugzilla.mozilla.org/show_bug.cgi?id=1365875

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-175 Code Inclusion
    CAPEC-182 Flash Injection
    CAPEC-201 Serialized Data External Linking
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-228 DTD Injection
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-251 Local Code Inclusion
    CAPEC-252 PHP Local File Inclusion
    CAPEC-253 Remote Code Inclusion
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-263 Force Use of Corrupted Files
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-538 Open-Source Library Manipulation
    CAPEC-549 Local Execution of Code
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-640 Inclusion of Code in Existing Process
    CAPEC-660 Root/Jailbreak Detection Evasion via Hooking
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-695 Repo Jacking
    CAPEC-698 Install Malicious Extension
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

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    References

    http://www.securityfocus.com/bid/100240
    http://www.securitytracker.com/id/1039124
    https://access.redhat.com/errata/RHSA-2017:2456
    https://access.redhat.com/errata/RHSA-2017:2534
    https://bugzilla.mozilla.org/show_bug.cgi?id=1365875
    https://security.gentoo.org/glsa/201803-14
    https://www.debian.org/security/2017/dsa-3928
    https://www.debian.org/security/2017/dsa-3968
    https://www.mozilla.org/security/advisories/mfsa2017-18/
    https://www.mozilla.org/security/advisories/mfsa2017-19/
    https://www.mozilla.org/security/advisories/mfsa2017-20/
    http://www.securityfocus.com/bid/100240
    http://www.securitytracker.com/id/1039124
    https://access.redhat.com/errata/RHSA-2017:2456
    https://access.redhat.com/errata/RHSA-2017:2534
    https://bugzilla.mozilla.org/show_bug.cgi?id=1365875
    https://security.gentoo.org/glsa/201803-14
    https://www.debian.org/security/2017/dsa-3928
    https://www.debian.org/security/2017/dsa-3968
    https://www.mozilla.org/security/advisories/mfsa2017-18/
    https://www.mozilla.org/security/advisories/mfsa2017-19/
    https://www.mozilla.org/security/advisories/mfsa2017-20/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High