Front-end Desynchronization Vulnerability in Progress® Telerik® Fiddler® Classic
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Progress Software | Progress® Telerik® Fiddler® Classic | unaffected |
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No data.
No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Progress Software | Progress Telerik Fiddler Classic |
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Vendor Workaround
Disable client connection reuse in Fiddler Classic: open Tools > Options > Connections and uncheck the "Reuse client connections" checkbox. Disabling client pipe reuse prevents the excess data of a malformed request from being parsed as a pipelined request.
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.097% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Progress Software
Progress Software progress Telerik Fiddler Classic |
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| Vendors & Products |
Progress Software
Progress Software progress Telerik Fiddler Classic |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In Progress® Telerik® Fiddler® Classic for Windows, versions prior to v6.0.20262.10021, front-end request desynchronization is possible in the proxy request forwarding component. A request that contains both a Content-Length and a Transfer-Encoding header is forwarded with both headers present, while Fiddler frames the body using Transfer-Encoding only. The remaining bytes on the reused client connection are then parsed as a separate pipelined request, so a local threat actor with low privileges can cause a single malformed request to be split into two requests forwarded to the origin server and receive an additional smuggled response, without requiring a vulnerable server. | |
| Title | Front-end Desynchronization Vulnerability in Progress® Telerik® Fiddler® Classic | |
| Weaknesses | CWE-444 | |
| References |
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| Metrics |
cvssV3_1
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