Ubuntu update for webkit2gtk



Risk Critical
Patch available YES
Number of vulnerabilities 7
CVE-ID CVE-2020-27918
CVE-2020-29623
CVE-2021-1765
CVE-2021-1789
CVE-2021-1799
CVE-2021-1801
CVE-2021-1870
CWE-ID CWE-416
CWE-459
CWE-264
CWE-843
CWE-200
CWE-840
Exploitation vector Network
Public exploit Vulnerability #4 is being exploited in the wild.
Vulnerability #7 is being exploited in the wild.
Vulnerable software
Subscribe 		Ubuntu
Operating systems & Components / Operating system

libwebkit2gtk-4.0-37 (Ubuntu package)
Operating systems & Components / Operating system package or component

libjavascriptcoregtk-4.0-18 (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU48190

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-2020-27918

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 processing web content within WebKit. A remote attacker can create a specially crafted web page, trick the victim into opening 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 the affected package webkit2gtk to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.10

libwebkit2gtk-4.0-37 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

libjavascriptcoregtk-4.0-18 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-4894-1


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) Incomplete cleanup

EUVDB-ID: #VU51625

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-2020-29623

CWE-ID: CWE-459 - Incomplete cleanup

Exploit availability: No

Description

The vulnerability allows an attacker to gain access to sensitive information.

The vulnerability exists due to software fails to to fully delete browsing history under certain circumstances via the “Clear History and Website Data” option. An attacker with access to the system can obtain browsing data after cleanup.

Mitigation

Update the affected package webkit2gtk to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.10

libwebkit2gtk-4.0-37 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

libjavascriptcoregtk-4.0-18 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-4894-1


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.

3) Security restrictions bypass

EUVDB-ID: #VU50232

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-2021-1765

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 to application does not properly impose sanboxing policy in WebKit. A remote attacker can create a specially crafted web page, trick the victim into visiting it and bypass implemented security restrictions.

Mitigation

Update the affected package webkit2gtk to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.10

libwebkit2gtk-4.0-37 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

libjavascriptcoregtk-4.0-18 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-4894-1


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) Type Confusion

EUVDB-ID: #VU50234

Risk: High

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-2021-1789

CWE-ID: CWE-843 - Type confusion

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error in WebKit. A remote attacker can trick the victim to open a specially crafted website, trigger a type confusion error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected package webkit2gtk to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.10

libwebkit2gtk-4.0-37 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

libjavascriptcoregtk-4.0-18 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-4894-1


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?

Yes. This vulnerability is being exploited in the wild.

5) Information disclosure

EUVDB-ID: #VU50235

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-2021-1799

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 a port redirection issue in WebRTC. A remote attacker can gain unauthorized access to sensitive information, such as open ports in the local network.

Mitigation

Update the affected package webkit2gtk to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.10

libwebkit2gtk-4.0-37 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

libjavascriptcoregtk-4.0-18 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-4894-1


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.

6) Security restrictions bypass

EUVDB-ID: #VU50233

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-2021-1801

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 to application does not properly impose sanboxing policy in WebKit. A remote attacker can create a specially crafted web page, trick the victim into visiting it and bypass implemented security restrictions.

Mitigation

Update the affected package webkit2gtk to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.10

libwebkit2gtk-4.0-37 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

libjavascriptcoregtk-4.0-18 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-4894-1


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.

7) Business Logic Errors

EUVDB-ID: #VU50043

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-2021-1870

CWE-ID: CWE-840 - Business Logic Errors (3.0)

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to a logic issue in the WebKit component. A remote attacker can trick a victim to visit a malicious website and execute arbitrary code on the system.

Note: The vulnerability is being actively exploited in the wild.

Mitigation

Update the affected package webkit2gtk to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.10

libwebkit2gtk-4.0-37 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

libjavascriptcoregtk-4.0-18 (Ubuntu package): before 2.30.6-0ubuntu0.20.10.1

CPE2.3 External links

http://ubuntu.com/security/notices/USN-4894-1


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?

Yes. This vulnerability is being exploited in the wild.



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