Multiple vulnerabilities in Firefox for Android

1) Resource management error

EUVDB-ID: #VU46016

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-2020-15664

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to the way Firefox handles prompts. By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user confusion, this could result in an unintended or malicious extension being installed.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 79.0.4

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-39/

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 perform certain actions on the device.

Is there known malware, which exploits this vulnerability?

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

2) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU45798

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12401

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to usage of ECDSA signatures. A local user can perform a side channel attack and gain access to sensitive information.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 79.0.4

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-39/

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 perform certain actions on the device.

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.

3) Cryptographic issues

EUVDB-ID: #VU46019

Risk: Low

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-2020-6829

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

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

The vulnerability exists due to usage of wNAF point multiplication algorithm when performing EC scalar point multiplication, which leaked partial information about the nonce used during signature generation. A remote attacker can perform an electro-magnetic side-channel attack and recover the private key.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 79.0.4

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-39/

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 perform certain actions on the device.

Is there known malware, which exploits this vulnerability?

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

4) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU45797

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12400

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists in Mozilla NSS library in the way P-384 and P-521 curves are used in the generation of EDSA signatures, leaking partial information about the ECDSA nonce. Given a small number of ECDSA signatures, this information can be used to steal the private key.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 79.0.4

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-39/

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 perform certain actions on the device.

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.

5) Information disclosure

EUVDB-ID: #VU46021

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15666

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 an MediaError message. When trying to load a non-video in an audio/video context the exact status code (200, 302, 404, 500, 412, 403, etc.) was disclosed via the MediaError Message. This level of information leakage is inconsistent with the standardized onerror/onsuccess disclosure and can lead to inferring login status to services or device discovery on a local network among other attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 79.0.4

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-39/

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 perform certain actions on the device.

Is there known malware, which exploits this vulnerability?

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

6) Race condition

EUVDB-ID: #VU46023

Risk: Low

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-2020-15668

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition when reading certification information during certificate import. A remote attacker can exploit the race and gain gain access to potentially sensitive data.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 79.0.4

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-39/

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 perform certain actions on the device.

Is there known malware, which exploits this vulnerability?

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

7) Buffer overflow

EUVDB-ID: #VU46017

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-2020-15670

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 update from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 79.0.4

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-39/

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 perform certain actions on the device.

Is there known malware, which exploits this vulnerability?

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

8) Race condition

EUVDB-ID: #VU46260

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15671

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a race condition when saving passwords. When typing in a password under certain conditions, a race may have occured where the InputContext was not being correctly set for the input field, resulting in the typed passwod being saved to the keyboard dictionary.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 79.0.4

CPE2.3

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-39/

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 perform certain actions on the device.

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.

Risk	High
Patch available	YES
Number of vulnerabilities	8
CVE-ID	CVE-2020-15664 CVE-2020-12401 CVE-2020-6829 CVE-2020-12400 CVE-2020-15666 CVE-2020-15668 CVE-2020-15670 CVE-2020-15671
CWE-ID	CWE-399 CWE-327 CWE-310 CWE-200 CWE-362 CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Firefox for Android Mobile applications / Apps for mobile phones
Vendor	Mozilla