Host header injection in YouTrack

1) Injection

EUVDB-ID: #VU58012

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-43185

CWE-ID: CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to improper validation of HTTP headers. A remote attacker can inject arbitrary Host header and perform spoofing attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

YouTrack: 2017.1.30791 - 2021.3.22664

CPE2.3

• cpe:2.3:a:jetbrains_s.r.o.:youtrack:2017.1.30791:*:*:*:*:*:*:*
• cpe:2.3:a:jetbrains_s.r.o.:youtrack:2017.1.30867:*:*:*:*:*:*:*
• cpe:2.3:a:jetbrains_s.r.o.:youtrack:2017.1.30973:*:*:*:*:*:*:*

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.