Multiple vulnerabilities in Mozilla Firefox

1) Information disclosure

EUVDB-ID: #VU32897

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15652

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output in stack trace for JavaScript errors. A remote attacker can obtain result of a cross-origin redirect.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 78.0.2

Firefox ESR: 60.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-31/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Information disclosure

EUVDB-ID: #VU32900

Risk: Medium

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15655

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists in the Extension APIs. A redirected HTTP request which is observed or modified through a web extension could bypass existing CORS checks, leading to potential disclosure of cross-origin information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 70.0 - 78.0.2

Firefox ESR: 78.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32901

Risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15653

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to application does not properly impose security restrictions, when allowing popups. A remote attacker can create a specially crafted web page with noopener links that may allow an attacker to bypass iframe sandbox for websites relying on sandbox configurations, if allow-popups flag is set.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 70.0 - 78.0.2

Firefox ESR: 78.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Type Confusion

EUVDB-ID: #VU32902

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15656

CWE-ID: CWE-843 - Type confusion

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error when JIT optimizations involving the Javascript arguments object could confuse later optimizations in IonMonkey. A remote attacker can pass specially crafted data to the application, trigger a type confusion error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 70.0 - 78.0.2

Firefox ESR: 78.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Input validation error

EUVDB-ID: #VU32903

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15658

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to insufficient validation of special characters during file download, which led to an attacker being able to cut off the file ending at an earlier position, leading to a different file type being downloaded than shown in the dialog. A remote attacker can override file type when saving data to disk.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 70.0 - 78.0.2

Firefox ESR: 78.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Insecure DLL loading

EUVDB-ID: #VU32904

Risk: Low

CVSSv3.1: 7.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15657

CWE-ID: CWE-427 - Uncontrolled Search Path Element

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to the application loads DLL libraries in an insecure manner from the installation directory. A remote attacker can place a specially crafted .dll file into directory, from which Firefox is being installed, trick the victim into launching the Firefox installer and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 70.0 - 78.0.2

Firefox ESR: 78.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

7) Resource management error

EUVDB-ID: #VU32906

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15654

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 70.0 - 78.0.2

Firefox ESR: 78.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

8) Buffer overflow

EUVDB-ID: #VU32899

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15659

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 78.0.2

Firefox ESR: 60.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-31/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

9) Improperly implemented security check for standard

EUVDB-ID: #VU29860

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-6514

CWE-ID: CWE-358 - Improperly Implemented Security Check for Standard

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to WebRTC used the memory address of a class instance as a connection identifier. A remote attacker can use the obtained value to bypass ASLR protection.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Firefox ESR: 60.0 - 78.0.2

Mozilla Firefox: 60.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-31/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

10) Use-after-free

EUVDB-ID: #VU29152

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-6463

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to use-after-free error in ANGLE in Google Chrome. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a heap-based buffer overflow and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Firefox ESR: 60.0 - 78.0.2

Mozilla Firefox: 60.0 - 78.0.2

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-30/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-31/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-32/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Risk	High
Patch available	YES
Number of vulnerabilities	10
CVE-ID	CVE-2020-15652 CVE-2020-15655 CVE-2020-15653 CVE-2020-15656 CVE-2020-15658 CVE-2020-15657 CVE-2020-15654 CVE-2020-15659 CVE-2020-6514 CVE-2020-6463
CWE-ID	CWE-200 CWE-264 CWE-843 CWE-20 CWE-427 CWE-399 CWE-119 CWE-358 CWE-416
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #9 is available.
Vulnerable software	Mozilla Firefox Client/Desktop applications / Web browsers Firefox ESR Client/Desktop applications / Web browsers
Vendor	Mozilla