SB2022111725 - Information disclosure in Zulip Server

Description

This security bulletin contains information about 1 vulnerability.

1) Information exposure through timing discrepancy (CVE-ID: CVE-2022-41914)

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

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

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.

Remediation

Install update from vendor's website.

References

• https://github.com/zulip/zulip/security/advisories/GHSA-q5gx-377v-w76f
• https://github.com/zulip/zulip/commit/59edbfa4113d140d3e20126bc65f4d67b2a8ffe5