Amazon Linux AMI update for tomcat7

1) Cross-site scripting

EUVDB-ID: #VU18638

Risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-0221

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: Yes

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within SSI printenv command, when parsing URI. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Example:

http://[host]/printenv.shtml?%3Cscript%3Ealert(%27xss%27)%3C/script%3E

Mitigation

Update the affected packages:

noarch:
    tomcat7-admin-webapps-7.0.94-1.35.amzn1.noarch
    tomcat7-jsp-2.2-api-7.0.94-1.35.amzn1.noarch
    tomcat7-7.0.94-1.35.amzn1.noarch
    tomcat7-docs-webapp-7.0.94-1.35.amzn1.noarch
    tomcat7-javadoc-7.0.94-1.35.amzn1.noarch
    tomcat7-el-2.2-api-7.0.94-1.35.amzn1.noarch
    tomcat7-log4j-7.0.94-1.35.amzn1.noarch
    tomcat7-servlet-3.0-api-7.0.94-1.35.amzn1.noarch
    tomcat7-lib-7.0.94-1.35.amzn1.noarch
    tomcat7-webapps-7.0.94-1.35.amzn1.noarch

src:
    tomcat7-7.0.94-1.35.amzn1.src

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2019-1235.html

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.