Vulnerability identifier: #VU69404
Vulnerability risk: Medium
CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-208
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Zulip Server
Web applications /
Other software
Vendor: Zulip
Description
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to a weak generation mechanism of SCIM bearer tokens. A remote attacker can infer the value of the SCIM bearer token by performing a sophisticated timing analysis on a large number of failing requests. If successful, this would allow the attacker to impersonate the SCIM client for its abilities to read and update user accounts in the Zulip organization.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Zulip Server: 5.0 - 5.6
External links
http://github.com/zulip/zulip/security/advisories/GHSA-q5gx-377v-w76f
http://github.com/zulip/zulip/commit/59edbfa4113d140d3e20126bc65f4d67b2a8ffe5
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.