Ubuntu update for tomcat8



| Updated: 2025-04-23
Risk High
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2020-13935
CVE-2020-1935
CVE-2020-9484
CWE-ID CWE-835
CWE-444
CWE-502
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Public exploit code for vulnerability #3 is available.
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

tomcat8 (Ubuntu package)
Operating systems & Components / Operating system package or component

libtomcat8-java (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Infinite loop

EUVDB-ID: #VU29723

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-13935

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop when processing payload length in a WebSocket frame. A remote attacker can send a specially crafted request to the application, consume all available system resources and cause denial of service conditions.

Mitigation

Update the affected package tomcat8 to the latest version.

Vulnerable software versions

Ubuntu: 16.04

tomcat8 (Ubuntu package): before 8.0.32-1ubuntu1.13

libtomcat8-java (Ubuntu package): before 8.0.32-1ubuntu1.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4448-1


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. However, proof of concept for this vulnerability is available.

2) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU25807

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-1935

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform HTTP request smuggling attack.

The vulnerability exists due to the HTTP header parsing code uses an approach to end-of-line parsing that allows some invalid HTTP headers to be parsed as valid. A remote attacker can send a specially crafted HTTP request and perform HTTP request smuggling attack.

Mitigation

Update the affected package tomcat8 to the latest version.

Vulnerable software versions

Ubuntu: 16.04

tomcat8 (Ubuntu package): before 8.0.32-1ubuntu1.13

libtomcat8-java (Ubuntu package): before 8.0.32-1ubuntu1.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4448-1


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) Deserialization of Untrusted Data

EUVDB-ID: #VU28158

Risk: High

CVSSv4.0: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2020-9484

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: Yes

Description

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

The vulnerability exists due to insecure input validation when processing serialized data in uploaded files names. A remote attacker can pass specially crafted file name to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that the server is configured to use PersistenceManager with a FileStore and the attacker knows relative file path from storage location.

Mitigation

Update the affected package tomcat8 to the latest version.

Vulnerable software versions

Ubuntu: 16.04

tomcat8 (Ubuntu package): before 8.0.32-1ubuntu1.13

libtomcat8-java (Ubuntu package): before 8.0.32-1ubuntu1.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4448-1


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. However, proof of concept for this vulnerability is available.



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