Debian update for firefox-esr



Published: 2020-11-19
Risk High
Patch available YES
Number of vulnerabilities 10
CVE ID 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
CWE ID CWE-346
CWE-20
CWE-79
CWE-264
CWE-416
CWE-358
CWE-200
CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
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firefox-esr (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Advisory

1) Origin validation error

Risk: Medium

CVSSv3: 4.1 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-16012

CWE-ID: CWE-346 - Origin Validation Error

Exploit availability: No

Description

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

The vulnerability exists due to the way browser handles requests to cross-origin images. When drawing a transparent image on top of an unknown cross-origin image, the Skia library drawImage function takes a variable amount of time depending on the content of the underlying image. This results in cross-origin information exposure of image content through timing side-channel attacks.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

2) Input validation error

Risk: Medium

CVSSv3: 6.5 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-26951

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input. 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 the built-in sanitizer.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

3) Insufficient UI Warning of Dangerous Operations

Risk: Medium

CVSSv3: 5.3 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-26953

CWE-ID: -

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to the way under certain conditions Firefox enters the fullscreen mode without displaying UI notification. A remote attacker can perform a phishing attack.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

4) Universal cross-site scripting

Risk: Medium

CVSSv3: 5.3 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-26956

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

5) Permissions, Privileges, and Access Controls

Risk: Medium

CVSSv3: 4.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-26958

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due Firefox does not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. A remote attacker can exploit this behavior to perform a cross-site script inclusion vulnerability or bypass implemented Content Security Policy restrictions.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

6) Use-after-free

Risk: Medium

CVSSv3: 6.5 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-26959

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the WebRequestService component during browser shutdown. A remote attacker can create a specially crafted web page, trick the victim into visiting it, force the victim to shutdown the browser, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

7) Use-after-free

Risk: High

CVSSv3: 7.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-26960

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within nsTArray implementation. If the Compact() method was called on an nsTArray, the array could have been reallocated without updating other pointers. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

8) Improperly implemented security check for standard

Risk: Medium

CVSSv3: 4.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-26961

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a DNS rebinding attack.

The vulnerability exists due to the way Firefox filters IPv4 mapped IP addresses. When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

9) Information disclosure

Risk: Low

CVSSv3: 2.9 [CVSS:3.0/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-2020-26965

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No

Description

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

The vulnerability exists due to the way software keyboards are handled by the Firefox. Some websites have a feature "Show Password" where clicking a button will change a password field into a textbook field, revealing the typed password. If, when using a software keyboard that remembers user input, a user typed their password and used that feature, the type of the password field was changed, resulting in a keyboard layout change and the possibility for the software keyboard to remember the typed password.

A local user leverage this behavior to gain access to passwords, stored by software keyboards.

Mitigation

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

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.

Is there known malware, which exploits this vulnerability?

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

10) Buffer overflow

Risk: High

CVSSv3: 7.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-26968

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

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

Update firefox-esr package to version 78.5.0esr-1~deb10u1.

Vulnerable software versions

firefox-esr (Debian package): 60.8.0esr-1~deb10u1, 60.9.0esr-1~deb10u1, 68.2.0esr-1~deb10u1, 68.3.0esr-1~deb10u1, 68.4.0esr-1~deb10u1, 68.4.1esr-1~deb10u1, 68.5.0esr-1~deb10u1, 68.6.0esr-1~deb10u1, 68.6.1esr-1~deb10u1, 68.7.0esr-1~deb10u1, 68.8.0esr-1~deb10u1, 68.9.0esr-1~deb10u1, 68.10.0esr-1~deb10u1, 68.11.0esr-1~deb10u1, 68.12.0esr-1~deb10u1, 78.3.0esr-1~deb10u1, 78.4.0esr-1~deb10u1, 78.4.0esr-1~deb10u2, 78.4.1esr-1~deb10u1

CPE External links

https://www.debian.org/security/2020/dsa-4793

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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