Zoom Client for Meetings (for Android, iOS…: URL Redirection to Untrusted Site
CVE-2022-28763 is a critical-severity URL redirection to untrusted site vulnerability in Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) from Zoom Video Communications, with a CVSS 3.1 base score of 9.6 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists version 5.12.2 as the first without the flaw, so updating Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.51% chance of exploitation within 30 days, higher than 75% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) to 5.12.2 or a later version.
- Update Zoom VDI Windows Meeting Clients to 5.12.2 or a later version.
- Update Zoom Rooms for Conference Room (for Android, iOS, Linux, macOS, and Windows) to 5.12.2 or a later version.
- Read the advisory on explore.zoom.us for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Zoom Video Communications | Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) | before 5.12.2 | 5.12.2 |
| Zoom Video Communications | Zoom VDI Windows Meeting Clients | before 5.12.2 | 5.12.2 |
| Zoom Video Communications | Zoom Rooms for Conference Room (for Android, iOS, Linux, macOS, and Windows) | before 5.12.2 | 5.12.2 |
| Zoom | Meetings | before 5.12.2 | 5.12.2 |
| Zoom | Rooms For Conference Rooms | before 5.12.2 | 5.12.2 |
| Zoom | Virtual Desktop Infrastructure | before 5.12.2 | 5.12.2 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.8 | High | CNA (zoom.us) |
| CVSS 3.1 | 9.6 | Critical | NVD |
Official description
The Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) before version 5.12.2 is susceptible to a URL parsing vulnerability. If a malicious Zoom meeting URL is opened, the malicious link may direct the user to connect to an arbitrary network address, leading to additional attacks including session takeovers.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: URL Redirection to Untrusted Site
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
How developers prevent this class of flaw
- Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs. For example, ID 1 could map to /login.asp and ID 2 could map to http://www.example.com/. Features such as the ESAPI AccessReferenceMap provide this capability.
- Ensure that no externally-supplied requests are honored by requiring that all redirect requests include a unique nonce generated by the application. Be sure that the nonce is not predictable (CWE-330).
More URL Redirection to Untrusted Site vulnerabilities (CWE-601)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Recent URL Redirection to Untrusted Site vulnerabilities
- 8.8 High severity
- 9.6 Critical severity
- 8.2 High severity
- 7.4 High severity
- 9.8 Critical severity
- 8.5 High severity
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