User Enumeration Vulnerability in Citrix XenApp by Citrix
CVE-2020-13998

5.3MEDIUM

Key Information:

Vendor
Citrix
Status
Xenapp
Vendor
CVE Published:
11 June 2020

Summary

A vulnerability in Citrix XenApp 6.5 allows remote unauthenticated attackers to determine whether a user exists on the server when two-factor authentication (2FA) is enabled. This occurs due to the behavior of the 2FA error page, which is displayed only after a valid username is entered. As a result, attackers can exploit this mechanism to enumerate valid user accounts, posing a significant security risk. Note that this vulnerability affects products that are no longer maintained by Citrix.

References

https://gist.github.com/kampji/11e259d68ad98a6f0f898132f1...
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.