Advisories » MGASA-2021-0097

Updated firefox packages fix security vulnerabilities

Publication date: 04 Mar 2021
Type: security
Affected Mageia releases : 7 , 8
CVE: CVE-2021-23968 , CVE-2021-23969 , CVE-2021-23973 , CVE-2021-23978


If Content Security Policy blocked frame navigation, the full destination of a
redirect served in the frame was reported in the violation report; as opposed
to the original frame URI. This could be used to leak sensitive information
contained in such URIs (CVE-2021-23968).

As specified in the W3C Content Security Policy draft, when creating a
violation report, "User agents need to ensure that the source file is the URL
requested by the page, pre-redirects. If that’s not possible, user agents need
to strip the URL down to an origin to avoid unintentional leakage." Under
certain types of redirects, Firefox incorrectly set the source file to be the
destination of the redirects. This was fixed to be the redirect destination's
origin (CVE-2021-23969).

When trying to load a cross-origin resource in an audio/video context a
decoding error may have resulted, and the content of that MediaError message
may have revealed information about the resource (CVE-2021-23973).

Mozilla developers Alexis Beingessner, Tyson Smith, Nika Layzell, and Mats
Palmgren reported memory safety bugs present in Firefox ESR 78.7. Some of
these bugs showed evidence of memory corruption and we presume that with
enough effort some of these could have been exploited to run arbitrary code