Mozilla Developer Nicolas Silva found that when using WebRender, Firefox would under certain conditions leak arbitrary GPU memory to the visible screen. The leaked memory content was visible to the user, but not observable from web content. This vulnerability affects Firefox < 77.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Mozilla Developer Nicolas Silva found that when using WebRender, Firefox would under certain conditions     leak arbitrary GPU memory to the visible screen. The leaked memory content was visible to the user, but     not observable from web content. This vulnerability affects Firefox < 77. (CVE-2020-12407)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote host is affected by the vulnerability described in GLSA-202006-07 (Mozilla Firefox: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Mozilla Firefox. Please       review the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4383-1 advisory.

    Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially     crafted website, an attacker could potentially exploit these to cause a denial of service, spoof the     addressbar, or execute arbitrary code. (CVE-2020-12405, CVE-2020-12406, CVE-2020-12407, CVE-2020-12408,     CVE-2020-12409, CVE-2020-12410, CVE-2020-12411)

    It was discovered that NSS showed timing differences when performing DSA signatures. An attacker could     potentially exploit this to obtain private keys using a timing attack. (CVE-2020-12399)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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

The version of Firefox installed on the remote Windows host is prior to 77.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-20 advisory.

  - NSS has shown timing differences when performing DSA     signatures, which was exploitable and could eventually     leak private keys. (CVE-2020-12399)

  - When browsing a malicious page, a race condition in our     SharedWorkerService could occur and lead to a     potentially exploitable crash. (CVE-2020-12405)

  - Mozilla Developer Iain Ireland discovered a missing type     check during unboxed objects removal, resulting in a     crash. We presume that with enough effort that it could     be exploited to run arbitrary code. (CVE-2020-12406)

  - Mozilla Developer Nicolas Silva found that when using     WebRender, Firefox would under certain conditions leak     arbitrary GPU memory to the visible screen. The leaked     memory content was visible to the user, but not     observable from web content. (CVE-2020-12407)

  - When browsing a document hosted on an IP address, an     attacker could insert certain characters to flip domain     and path information in the address bar.
    (CVE-2020-12408)

  - Mozilla developers Tom Tung and Karl Tomlinson reported     memory safety bugs present in Firefox 76 and Firefox ESR     68.8. 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-2020-12409)

  - Mozilla developers :Gijs (he/him), Randell Jesup     reported memory safety bugs present in Firefox 76. 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-2020-12411)

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

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 77.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-20 advisory.

  - NSS has shown timing differences when performing DSA     signatures, which was exploitable and could eventually     leak private keys. (CVE-2020-12399)

  - When browsing a malicious page, a race condition in our     SharedWorkerService could occur and lead to a     potentially exploitable crash. (CVE-2020-12405)

  - Mozilla Developer Iain Ireland discovered a missing type     check during unboxed objects removal, resulting in a     crash. We presume that with enough effort that it could     be exploited to run arbitrary code. (CVE-2020-12406)

  - Mozilla Developer Nicolas Silva found that when using     WebRender, Firefox would under certain conditions leak     arbitrary GPU memory to the visible screen. The leaked     memory content was visible to the user, but not     observable from web content. (CVE-2020-12407)

  - When browsing a document hosted on an IP address, an     attacker could insert certain characters to flip domain     and path information in the address bar.
    (CVE-2020-12408)

  - Mozilla developers Tom Tung and Karl Tomlinson reported     memory safety bugs present in Firefox 76 and Firefox ESR     68.8. 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-2020-12409)

  - Mozilla developers :Gijs (he/him), Randell Jesup     reported memory safety bugs present in Firefox 76. 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-2020-12411)

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

ID	Name	Product	Family	Severity
245392	Linux Distros Unpatched Vulnerability : CVE-2020-12407	Nessus	Misc.	medium
137444	GLSA-202006-07 : Mozilla Firefox: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
137179	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-4383-1)	Nessus	Ubuntu Local Security Checks	high
137049	Mozilla Firefox < 77.0	Nessus	Windows	high
137048	Mozilla Firefox < 77.0	Nessus	MacOS X Local Security Checks	high

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CVE-2020-12407

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