Open redirect in Zulip Server

1) Open redirect

EUVDB-ID: #VU30541

Risk: Low

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:Clear]

CVE-ID: CVE-2019-19775

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The image thumbnailing handler in Zulip Server versions 1.9.0 to before 2.0.8 allowed an open redirect that was visible to logged-in users.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zulip Server: 1.9.0 - 2.0.7

CPE2.3

• cpe:2.3:a:zulip:zulip_server:1.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:zulip:zulip_server:1.9.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:zulip:zulip_server:1.9.0:rc2:*:*:*:*:*:*

External links

https://blog.zulip.org/2019/12/13/zulip-server-2-0-8-security-release/
https://github.com/zulip/zulip/commit/b7c87a4d82397a5e6ac169b6098bed0b1ae7a583

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.