Security Fix(es) :

Mozilla: Memory safety bugs fixed in Firefox 73 and Firefox ESR 68.5 (CVE-2020-6800) Mozilla: Out-of-bounds read when processing certain email messages (CVE-2020-6793) Mozilla: Setting a master password post-Thunderbird 52 does not delete unencrypted previously stored passwords (CVE-2020-6794) Mozilla: Crash processing S/MIME messages with multiple signatures (CVE-2020-6795) Mozilla: Incorrect parsing of template tag could result in JavaScript injection (CVE-2020-6798) Mozilla: Message ID calculation was based on uninitialized data (CVE-2020-6792)

The version of thunderbird installed on the remote host is prior to 68.5.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1408 advisory.

    When deriving an identifier for an email message, uninitialized memory was used in addition to the message     contents. This vulnerability affects Thunderbird < 68.5. (CVE-2020-6792)

    When processing an email message with an ill-formed envelope, Thunderbird could read data from a random     memory location. This vulnerability affects Thunderbird < 68.5. (CVE-2020-6793)

    Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR     68.4. 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. In general, these flaws cannot be exploited     through email in the Thunderbird product because scripting is disabled when reading mail, but are     potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5,     Firefox < 73, and Firefox < ESR68.5. (CVE-2020-6800)

    If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and     execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer     a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email     in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in     browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox     < ESR68.5. (CVE-2020-6798)

    If a user saved passwords before Thunderbird 60 and then later set a master password, an unencrypted copy     of these passwords is still accessible. This is because the older stored password file was not deleted     when the data was copied to a new format starting in Thunderbird 60. The new master password is added only     on the new file. This could allow the exposure of stored password data outside of user expectations. This     vulnerability affects Thunderbird < 68.5. (CVE-2020-6794)

    When processing a message that contains multiple S/MIME signatures, a bug in the MIME processing code     caused a null pointer dereference, leading to an unexploitable crash. This vulnerability affects     Thunderbird < 68.5. (CVE-2020-6795)



Tenable has extracted the preceding description block directly from the tested product 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 remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2020:14290-1 advisory.

  - A content process could have modified shared memory relating to crash reporting information, crash itself,     and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable     crash. This vulnerability affects Firefox < 73 and Firefox < ESR68.5. (CVE-2020-6796)

  - By downloading a file with the .fileloc extension, a semi-privileged extension could launch an arbitrary     application on the user's computer. The attacker is restricted as they are unable to download non-     quarantined files or supply command line arguments to the application, limiting the impact. Note: this     issue only occurs on Mac OSX. Other operating systems are unaffected. This vulnerability affects     Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5. (CVE-2020-6797)

  - If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and     execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer     a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email     in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in     browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox     < ESR68.5. (CVE-2020-6798)

  - Command line arguments could have been injected during Firefox invocation as a shell handler for certain     unsupported file types. This required Firefox to be configured as the default handler for a given file     type and for a file downloaded to be opened in a third party application that insufficiently sanitized URL     data. In that situation, clicking a link in the third party application could have been used to retrieve     and execute files whose location was supplied through command line arguments. Note: This issue only     affects Windows operating systems and when Firefox is configured as the default handler for non-default     filetypes. Other operating systems are unaffected. This vulnerability affects Firefox < 73 and Firefox <     ESR68.5. (CVE-2020-6799)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR     68.4. 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. In general, these flaws cannot be exploited     through email in the Thunderbird product because scripting is disabled when reading mail, but are     potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5,     Firefox < 73, and Firefox < ESR68.5. (CVE-2020-6800)

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 ESR installed on the remote Windows host is prior to 68.5. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-06 advisory.

  - Mozilla developers and community members Raul Gurzau, Tyson Smith, Bob Clary, Liz Henry, and Christian     Holler reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. 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-2020-6800)

  - A content process could have modified shared memory relating to crash reporting information, crash itself,     and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable     crash. (CVE-2020-6796)

  - By downloading a file with the .fileloc extension, a semi-privileged extension could launch an arbitrary     application on the user's computer. The attacker is restricted as they are unable to download non-     quarantined files or supply command line arguments to the application, limiting the impact. Note: this     issue only occurs on Mac OSX. Other operating systems are unaffected. (CVE-2020-6797)

  - If a <code><template></code> tag was used in a <code><select%gt;</code> tag, the parser could be     confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on     the browser behaving correctly could suffer a cross-site scripting vulnerability as a result.
    (CVE-2020-6798)

  - Command line arguments could have been injected during Firefox invocation as a shell handler for certain     unsupported file types. This required Firefox to be configured as the default handler for a given file     type and for a file downloaded to be opened in a third party application that insufficiently sanitized URL     data. In that situation, clicking a link in the third party application could have been used to retrieve     and execute files whose location was supplied through command line arguments.  Note: This issue only     affects Windows operating systems and when Firefox is configured as the default handler for non-default     filetypes. Other operating systems are unaffected. (CVE-2020-6799)

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 Thunderbird installed on the remote Windows host is prior to 68.5. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-07 advisory.

  - Mozilla developers and community members Raul Gurzau, Tyson Smith, Bob Clary, Liz Henry, and Christian     Holler reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. 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. In general, these flaws cannot be exploited through email in the     Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser     or browser-like contexts. (CVE-2020-6800)

  - When processing an email message with an ill-formed envelope, Thunderbird could read data from a random     memory location. (CVE-2020-6793)

  - If a user saved passwords before Thunderbird 60 and then later set a master password, an unencrypted copy     of these passwords is still accessible. This is because the older stored password file was not deleted     when the data was copied to a new format starting in Thunderbird 60. The new master password is added only     on the new file. This could allow the exposure of stored password data outside of user expectations.
    (CVE-2020-6794)

  - When processing a message that contains multiple S/MIME signatures, a bug in the MIME processing code     caused a null pointer dereference, leading to an unexploitable crash. (CVE-2020-6795)

  - By downloading a file with the .fileloc extension, a semi-privileged extension could launch an arbitrary     application on the user's computer. The attacker is restricted as they are unable to download non-     quarantined files or supply command line arguments to the application, limiting the impact. Note: this     issue only occurs on Mac OSX. Other operating systems are unaffected. (CVE-2020-6797)

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

Multiple security issues have been found in Thunderbird, which may lead to the execution of arbitrary code or denial of service.

The remote CentOS Linux 6 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2020:0521 advisory.

  - A content process could have modified shared memory relating to crash reporting information, crash itself,     and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable     crash. This vulnerability affects Firefox < 73 and Firefox < ESR68.5. (CVE-2020-6796)

  - If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and     execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer     a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email     in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in     browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox     < ESR68.5. (CVE-2020-6798)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR     68.4. 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. In general, these flaws cannot be exploited     through email in the Thunderbird product because scripting is disabled when reading mail, but are     potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5,     Firefox < 73, and Firefox < ESR68.5. (CVE-2020-6800)

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

The remote MiracleLinux 4 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2020-4471:05 advisory.

    * Mozilla: Missing bounds check on shared memory read in the parent process (CVE-2020-6796)
      * Mozilla: Memory safety bugs fixed in Firefox 73 and Firefox ESR 68.5 (CVE-2020-6800)
      * Mozilla: Incorrect parsing of template tag could result in JavaScript injection (CVE-2020-6798)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 remote MiracleLinux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2020-4469:04 advisory.

    * Mozilla: Missing bounds check on shared memory read in the parent process (CVE-2020-6796)
      * Mozilla: Memory safety bugs fixed in Firefox 73 and Firefox ESR 68.5 (CVE-2020-6800)
      * Mozilla: Incorrect parsing of template tag could result in JavaScript injection (CVE-2020-6798)

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

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

ID	Name	Product	Family	Published	Updated	Severity
134072	Scientific Linux Security Update : thunderbird on SL7.x x86_64 (20200224)	Nessus	Scientific Linux Local Security Checks	2/26/2020	3/26/2024	high
134899	Amazon Linux 2 : thunderbird (ALAS-2020-1408)	Nessus	Amazon Linux Local Security Checks	3/26/2020	12/11/2024	high
150679	SUSE SLES11 Security Update : MozillaFirefox (SUSE-SU-2020:14290-1)	Nessus	SuSE Local Security Checks	6/10/2021	6/10/2021	high
133677	Mozilla Firefox ESR < 68.5	Nessus	Windows	2/13/2020	11/18/2025	high
133691	Mozilla Thunderbird < 68.5	Nessus	Windows	2/14/2020	11/18/2025	high
133732	Debian DSA-4625-1 : thunderbird - security update	Nessus	Debian Local Security Checks	2/18/2020	3/27/2024	high
133769	CentOS 6 : firefox (RHSA-2020:0521)	Nessus	CentOS Local Security Checks	2/19/2020	10/9/2024	high
147407	NewStart CGSL MAIN 4.06 : firefox Multiple Vulnerabilities (NS-SA-2021-0004)	Nessus	NewStart CGSL Local Security Checks	3/10/2021	4/25/2023	critical
293861	MiracleLinux 4 : firefox-68.5.0-2.0.1.AXS4 (AXSA:2020-4471:05)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	high
294592	MiracleLinux 7 : firefox-68.5.0-2.0.1.el7.AXS7 (AXSA:2020-4469:04)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	high

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