SB2019090529 - Cross-site scripting in TeamCity

Description

This security bulletin contains information about 1 vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2019-15848)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear

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. The vulnerability allows cross-site scripting (XSS), potentially making it possible to send an arbitrary HTTP request to a TeamCity server under the name of the currently logged-in user.

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.

Remediation

Install update from vendor's website.

References

• https://blog.jetbrains.com/teamcity/2019/09/important-security-notice-xss-vulnerability-allowing-rce/
• https://gist.github.com/JLLeitschuh/fe6784391254b58de680bbda78a04a70
• https://twitter.com/JLLeitschuh/status/1169332316612644864?s=20
• https://www.softwaresecured.com/jetbrains-teamcity-reflected-xss/