Ubuntu update for thunderbird



Risk High
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2021-38503
CVE-2021-38504
CVE-2021-38506
CVE-2021-38507
CVE-2021-38509
CWE-ID CWE-254
CWE-416
CWE-357
CWE-1021
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Ubuntu
Operating systems & Components / Operating system

thunderbird (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Security features bypass

EUVDB-ID: #VU57876

Risk: High

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

CVE-ID: CVE-2021-38503

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

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

The vulnerability exists due to the iframe sandbox rules were not correctly applied to XSLT stylesheets. A remote attacker can load use an iframe to bypass restrictions such as executing scripts or navigating the top-level frame.

Mitigation

Update the affected package thunderbird to the latest version.

Vulnerable software versions

Ubuntu: 21.10

thunderbird (Ubuntu package): before 1:91.3.1+build1-0ubuntu0.21.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-5152-1


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) Use-after-free

EUVDB-ID: #VU57878

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-2021-38504

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 when interacting with an HTML input element's file picker dialog with webkitdirectory set. A remote attacker can trick the victim to open a specially crafted website, 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 the affected package thunderbird to the latest version.

Vulnerable software versions

Ubuntu: 21.10

thunderbird (Ubuntu package): before 1:91.3.1+build1-0ubuntu0.21.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-5152-1


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

EUVDB-ID: #VU57880

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-38506

CWE-ID: CWE-357 - Insufficient UI Warning of Dangerous Operations

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attacks.

The vulnerability exists due to Firefox could have entered fullscreen mode without notification or warning to the user. A remote attacker can perform spoofing attacks on the browser UI.

Mitigation

Update the affected package thunderbird to the latest version.

Vulnerable software versions

Ubuntu: 21.10

thunderbird (Ubuntu package): before 1:91.3.1+build1-0ubuntu0.21.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-5152-1


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) Security features bypass

EUVDB-ID: #VU57881

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-2021-38507

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

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

The vulnerability exists in the Opportunistic Encryption feature of HTTP2, which allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser from port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. As a result, a remote attacker can bypass Same-Origin-Policy on services hosted on other ports.

Mitigation

Update the affected package thunderbird to the latest version.

Vulnerable software versions

Ubuntu: 21.10

thunderbird (Ubuntu package): before 1:91.3.1+build1-0ubuntu0.21.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-5152-1


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) Improper Restriction of Rendered UI Layers or Frames

EUVDB-ID: #VU57883

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-2021-38509

CWE-ID: CWE-1021 - Improper Restriction of Rendered UI Layers or Frames

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of an unusual sequence of attacker-controlled events. A remote attacker can display a Javascript alert() dialog with arbitrary (although unstyled) contents over top of arbitrary webpage of the attacker's choosing.

Mitigation

Update the affected package thunderbird to the latest version.

Vulnerable software versions

Ubuntu: 21.10

thunderbird (Ubuntu package): before 1:91.3.1+build1-0ubuntu0.21.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-5152-1


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.



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