Ubuntu update for thunderbird
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2021-23968 CVE-2021-23969 CVE-2021-23973 CVE-2021-23978 CVE-2021-29950 |
| CWE-ID | CWE-358 CWE-200 CWE-119 CWE-312 |
| 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) Improperly implemented security check for standard
EUVDB-ID: #VU50881
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-2021-23968
CWE-ID:
CWE-358 - Improperly Implemented Security Check for Standard
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to incorrect implementation of W3C Content Security Policy. If Content Security Policy blocked frame navigation, the full destination of a redirect served in the frame was reported in the violation report; as opposed to the original frame URI. A remote attacker can gain knowledge of sensitive information contained in such URIs. MitigationUpdate the affected package thunderbird to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 20.10
thunderbird (Ubuntu package): before 1:78.8.1+build1-0ubuntu0.20.10.1
CPE2.3 External linkshttp://ubuntu.com/security/notices/USN-4936-1
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) Improperly implemented security check for standard
EUVDB-ID: #VU50879
Risk: Medium
CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-23969
CWE-ID:
CWE-358 - Improperly Implemented Security Check for Standard
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to incorrect implementation of W3C Content Security Policy. Under certain types of redirects Firefox incorrectly sets the source
file to be the destination of the redirects. A remote attacker can gain knowledge of the destination URL.
Update the affected package thunderbird to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 20.10
thunderbird (Ubuntu package): before 1:78.8.1+build1-0ubuntu0.20.10.1
CPE2.3 External linkshttp://ubuntu.com/security/notices/USN-4936-1
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) Information disclosure
EUVDB-ID: #VU50888
Risk: Low
CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-23973
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output via a decoding error, when trying to load a cross-origin resource in an audio/video context. A remote attacker can gain access to information about the resource.
MitigationUpdate the affected package thunderbird to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 20.10
thunderbird (Ubuntu package): before 1:78.8.1+build1-0ubuntu0.20.10.1
CPE2.3 External linkshttp://ubuntu.com/security/notices/USN-4936-1
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) Buffer overflow
EUVDB-ID: #VU50889
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-2021-23978
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe 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 webpage, 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.
MitigationUpdate the affected package thunderbird to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 20.10
thunderbird (Ubuntu package): before 1:78.8.1+build1-0ubuntu0.20.10.1
CPE2.3 External linkshttp://ubuntu.com/security/notices/USN-4936-1
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) Cleartext storage of sensitive information
EUVDB-ID: #VU52375
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-29950
CWE-ID:
CWE-312 - Cleartext Storage of Sensitive Information
Exploit availability: No
DescriptionThe vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to the way Thunderbird handles secret OpenPGP keys. The application unprotects a secret OpenPGP key prior to using it for a decryption,
signing or key import task. If the task runs into a failure, the secret
key may remain in memory in its unprotected state. A local user or malicious application can read the key and use it to decrypt email messages.
Update the affected package thunderbird to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 20.10
thunderbird (Ubuntu package): before 1:78.8.1+build1-0ubuntu0.20.10.1
CPE2.3 External linkshttp://ubuntu.com/security/notices/USN-4936-1
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.
