Oracle Linux 8 : firefox (ELSA-2020-5237)

high Nessus Plugin ID 143377


The remote Oracle Linux host is missing one or more security updates.


The remote Oracle Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2020-5237 advisory.

- When drawing a transparent image on top of an unknown cross-origin image, the Skia library drawImage function took a variable amount of time depending on the content of the underlying image. This resulted in potential cross-origin information exposure of image content through timing side- channel attacks. (CVE-2020-16012)

- A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. (CVE-2020-26951)

- Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerability, or a Content Security Policy bypass. (CVE-2020-26958)

- Mozilla: DoH did not filter IPv4 mapped IP Addresses (CVE-2020-26961)

- Mozilla developers Randell Jesup, Christian Holler, Jason Kratzer, Byron Campen, and Steve Fink reported memory safety bugs present in Firefox 82 and Firefox ESR 78.4. 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-2020-26968)

- Mozilla: Fullscreen could be enabled without displaying the security UI (CVE-2020-26953)

- In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. (CVE-2020-26956)

- During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. (CVE-2020-26959)

- Mozilla: Potential use-after-free in uses of nsTArray (CVE-2020-26960)

- Mozilla: Software keyboards may have remembered typed passwords (CVE-2020-26965)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Update the affected firefox package.

See Also

Plugin Details

Severity: High

ID: 143377

File Name: oraclelinux_ELSA-2020-5237.nasl

Version: 1.5

Type: local

Agent: unix

Published: 12/1/2020

Updated: 12/11/2020

Supported Sensors: Frictionless Assessment Agent, Nessus Agent

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 9.3

Temporal Score: 6.9

Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2020-26968


Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:oracle:linux:8, p-cpe:/a:oracle:linux:firefox

Required KB Items: Host/OracleLinux, Host/RedHat/release, Host/RedHat/rpm-list, Host/local_checks_enabled

Exploit Ease: No known exploits are available

Patch Publication Date: 12/1/2020

Vulnerability Publication Date: 11/17/2020

Reference Information

CVE: CVE-2020-16012, CVE-2020-26951, CVE-2020-26953, CVE-2020-26956, CVE-2020-26958, CVE-2020-26959, CVE-2020-26960, CVE-2020-26961, CVE-2020-26965, CVE-2020-26968