Debian update for thunderbird



Risk Critical
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2020-6819
CVE-2020-6820
CVE-2020-6821
CVE-2020-6822
CVE-2020-6825
CWE-ID CWE-416
CWE-125
CWE-787
CWE-119
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerability #2 is being exploited in the wild.
Vulnerable software
Subscribe 		thunderbird (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU26573

Risk: Critical

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2020-6819

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 caused by a race condition running the nsDocShell destructor. A remote attacker can create a specially crafted website, 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.

Note, this vulnerability is being actively exploited in the wild in targeted attacks.

Mitigation

Update thunderbird package to one of the following versions: 1:68.7.0-1~deb9u1, 1:68.7.0-1~deb10u1.

Vulnerable software versions

thunderbird (Debian package): 1:52.4.0-1~deb9u1 - 1:68.6.0-1~deb10u1

CPE2.3 External links

http://www.debian.org/security/2020/dsa-4656


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?

Yes. This vulnerability is being exploited in the wild.

2) Use-after-free

EUVDB-ID: #VU26574

Risk: Critical

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2020-6820

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 caused by a race condition handling ReadableStream. A remote attacker can create a specially crafted website, 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.

Note, this vulnerability is being actively exploited in the wild in targeted attacks.

Mitigation

Update thunderbird package to one of the following versions: 1:68.7.0-1~deb9u1, 1:68.7.0-1~deb10u1.

Vulnerable software versions

thunderbird (Debian package): 1:52.4.0-1~deb9u1 - 1:68.6.0-1~deb10u1

CPE2.3 External links

http://www.debian.org/security/2020/dsa-4656


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?

Yes. This vulnerability is being exploited in the wild.

3) Out-of-bounds read

EUVDB-ID: #VU26649

Risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-6821

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition when using WebGL copyTexSubImage method. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds read error and read contents of uninitialized memory on the system.

Mitigation

Update thunderbird package to one of the following versions: 1:68.7.0-1~deb9u1, 1:68.7.0-1~deb10u1.

Vulnerable software versions

thunderbird (Debian package): 1:52.4.0-1~deb9u1 - 1:68.6.0-1~deb10u1

CPE2.3 External links

http://www.debian.org/security/2020/dsa-4656


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) Out-of-bounds write

EUVDB-ID: #VU26650

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-2020-6822

CWE-ID: CWE-787 - Out-of-bounds write

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 condition in GMPDecodeData when processing images larger than 4Gb on 32-bit builds. A remote attacker can create a specially crafted image, trick the victim into opening it, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Update thunderbird package to one of the following versions: 1:68.7.0-1~deb9u1, 1:68.7.0-1~deb10u1.

Vulnerable software versions

thunderbird (Debian package): 1:52.4.0-1~deb9u1 - 1:68.6.0-1~deb10u1

CPE2.3 External links

http://www.debian.org/security/2020/dsa-4656


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) Buffer overflow

EUVDB-ID: #VU26653

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-2020-6825

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 website, 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 thunderbird package to one of the following versions: 1:68.7.0-1~deb9u1, 1:68.7.0-1~deb10u1.

Vulnerable software versions

thunderbird (Debian package): 1:52.4.0-1~deb9u1 - 1:68.6.0-1~deb10u1

CPE2.3 External links

http://www.debian.org/security/2020/dsa-4656


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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