CVE-2019-11763

Current Description

Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

Basic Data

PublishedJanuary 08, 2020
Last ModifiedJanuary 13, 2020
Assignercve@mitre.org
Data TypeCVE
Data FormatMITRE
Data Version4.0
Problem TypeCWE-79
CVE Data Version4.0

Base Metric V2

CVSS 2 - Version2.0
CVSS 2 - Vector StringAV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS 2 - Access VectorNETWORK
CVSS 2 - Access ComplexityMEDIUM
CVSS 2 - AuthenticationNONE
CVSS 2 - Confidentiality ImpactNONE
CVSS 2 - Availability ImpactNONE
CVSS 2 - Base Score4.3
SeverityMEDIUM
Exploitability Score8.6
Impact Score2.9
Obtain All Privilegefalse
Obtain User Privilegefalse
Obtain Other Privilegefalse

Base Metric V3

No data provided.

Configurations

  • OR - Configuration 1
    Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
    2.3ApplicationMozillaFirefox********70.0
    2.3ApplicationMozillaFirefox Esr********68.2
    2.3ApplicationMozillaThunderbird********68.2

Vulnerable Software List

VendorProductVersions
Mozilla Firefox *
Mozilla Thunderbird *
Mozilla Firefox Esr *

References

NameSourceURLTags
https://bugzilla.mozilla.org/show_bug.cgi?id=1584216CONFIRMhttps://bugzilla.mozilla.org/show_bug.cgi?id=1584216Permissions Required Vendor Advisory Vendor Advisory Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-33/CONFIRMhttps://www.mozilla.org/security/advisories/mfsa2019-33/
https://www.mozilla.org/security/advisories/mfsa2019-34/CONFIRMhttps://www.mozilla.org/security/advisories/mfsa2019-34/
https://www.mozilla.org/security/advisories/mfsa2019-35/CONFIRMhttps://www.mozilla.org/security/advisories/mfsa2019-35/