Advisories ยป MGASA-2020-0461

Updated firefox packages fix security vulnerabilities

Publication date: 17 Dec 2020
Modification date: 17 Dec 2020
Type: security
Affected Mageia releases : 7
CVE: CVE-2020-16042 , CVE-2020-26971 , CVE-2020-26973 , CVE-2020-26974 , CVE-2020-26978 , CVE-2020-35111 , CVE-2020-35113


When a BigInt was right-shifted the backing store was not properly cleared,
allowing uninitialized memory to be read (CVE-2020-16042).

Certain blit values provided by the user were not properly constrained leading
to a heap buffer overflow in WebGL on some video drivers (CVE-2020-26971).

Certain input to the CSS Sanitizer confused it, resulting in incorrect
components being removed. This could have been used as a sanitizer bypass

When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object
could have been incorrectly cast to the wrong type. This resulted in a heap
user-after-free, memory corruption, and a potentially exploitable crash

Using techniques that built on the slipstream research, a malicious webpage
could have exposed both an internal network's hosts as well as services running
on the user's local machine (CVE-2020-26978).

When an extension with the proxy permission registered to receive ,
the proxy.onRequest callback was not triggered for view-source URLs. While web
content cannot navigate to such URLs, a user opening View Source could have
inadvertently leaked their IP address (CVE-2020-35111).

Mozilla developer Christian Holler reported memory safety bugs present in
Firefox ESR 78.5. 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 (CVE-2020-35113).