Cisco Webex Teams: Unprotected Transport of Credentials
CVE-2024-20395 is a high-severity unprotected transport of credentials vulnerability in Cisco Webex Teams from Cisco, with a CVSS 3.1 base score of 7.3 out of 10. It can be exploited from the same local network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected Cisco Webex Teams versions: 3.0.13464.0; 3.0.13538.0; 3.0.13588.0, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.22% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Cisco Webex Teams you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on sec.cloudapps.cisco.com for workarounds and exact fixed builds.
- 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 |
|---|---|---|---|
| Cisco | Cisco Webex Teams | 3.0.13464.0; 3.0.13538.0; 3.0.13588.0; 3.0.14154.0; 3.0.14234.0; 3.0.14375.0; 3.0.14741.0; 3.0.14866.0; and 32 more ranges | Not stated |
| Cisco | webex_teams | 3.0.13464.0; 3.0.13538.0; 3.0.13588.0; 3.0.14154.0; 3.0.14234.0; 3.0.14375.0; 3.0.14741.0; 3.0.14866.0; and 32 more ranges | Not stated |
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
- AdjacentThe attacker must be on the same local network segment.
- 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
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 6.4 | Medium | CNA (cisco.com) |
| CVSS 3.1 | 7.3 | High | NVD |
Official description
A vulnerability in the media retrieval functionality of Cisco Webex App could allow an unauthenticated, adjacent attacker to gain access to sensitive session information. This vulnerability is due to insecure transmission of requests to backend services when the app accesses embedded media, such as images. An attacker could exploit this vulnerability by sending a message with embedded media that is stored on a messaging server to a targeted user. If the attacker can observe transmitted traffic in a privileged network position, a successful exploit could allow the attacker to capture session token information from insecurely transmitted requests and possibly reuse the captured session information to take further actions as the targeted user.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unprotected Transport of Credentials
Login pages do not use adequate measures to protect the user name and password while they are in transit from the client to the server.
More Unprotected Transport of Credentials vulnerabilities (CWE-523)
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
Advisories
Other vulnerabilities in Cisco Webex Teams
- 8.8 High severity
Recent Unprotected Transport of Credentials vulnerabilities
- 7.5 High severity
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