Remote‑User HTTP Header Authentication Bypass in Znuny
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Znuny | Znuny | unaffected |
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No data.
No data.
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| Znuny | Znuny |
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No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.234% probability within 30 days)
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| Metrics |
ssvc
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| Title | Remote‑User HTTP Header Authentication Bypass in Znuny |
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| Description | In Znuny through 7.3.6, an attacker can bypass specific standard login procedures and gain unauthorized access to sensitive system functions by manipulating a specific HTTP request header. Because the application incorrectly trusts this header, an attacker can impersonate any user, including administrators, without requiring a password. This grants full access to confidential data and system controls. More specifically, the HTTPBasicAuth modules for the agent (Kernel::System::Auth::HTTPBasicAuth) and customer (Kernel::System::CustomerAuth::HTTPBasicAuth) interfaces read the username to log in not only from $ENV{REMOTE_USER} (set by the web server after successful authentication), but also, as a fallback, from $ENV{HTTP_REMOTE_USER}, which is populated directly from an attacker-controllable "Remote-User" request header. On systems where HTTPBasicAuth was configured as the authentication backend, this allowed an attacker to log in as any existing user by sending a request with a forged Remote-User header, without providing any credentials. | |
| First Time appeared |
Znuny
Znuny znuny |
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| Weaknesses | CWE-348 | |
| CPEs | cpe:2.3:a:znuny:znuny:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Znuny
Znuny znuny |
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| References |
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| Metrics |
cvssV4_0
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