GHSA-2qgr-gfvj-qpcr Dragonfly incorrectly handles a task structure’s usedTrac field

• Go github.com/dragonflyoss/dragonfly: < 2.1.0 → fixed in 2.1.0 • Go d7y.io/dragonfly/v2: < 2.1.0 → fixed in 2.1.0

Impact The processPieceFromSource method (figure 4.1) is part of a task processing mechanism. The method writes pieces of data to storage, updating a Task structure along the way. The method does not update the structure’s usedTraffic field, because an uninitialized variable n is used as a guard to the AddTraffic method call, instead of the result.Size variable. ```golang var n int64 result.Size, err = pt.GetStorage().WritePiece([skipped]) result.FinishTime = time.Now().UnixNano() if n > 0 { pt.AddTraffic(uint64(n)) } ``` A task is processed by a peer. The usedTraffic metadata is not updated during the processing. Rate limiting is incorrectly applied, leading to a denial-of-service condition for the peer. Patches • Dragonfy v2.1.0 and above. Workarounds There are no effective workarounds, beyond upgrading. References A third party security audit was performed by Trail of Bits, you can see the full report. If you have any questions or comments about this advisory, please email us at [email protected].