Authentication bypass in JetBrains Ktor



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-43203
CWE-ID CWE-287
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Kotlin Ktor
Server applications / Frameworks for developing and running applications

Vendor JetBrains s.r.o.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Authentication

EUVDB-ID: #VU58000

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-2021-43203

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to improper nonce verification during the OAuth2 authentication process. A remote attacker can bypass authentication process and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Kotlin Ktor: 1.0.0 - 1.6.3

CPE2.3 External links

https://blog.jetbrains.com/blog/2021/11/08/jetbrains-security-bulletin-q3-2021


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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