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Diffstat (limited to 'changes/bug40391')
| -rw-r--r-- | changes/bug40391 | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/changes/bug40391 b/changes/bug40391 new file mode 100644 index 0000000000..e3c186275f --- /dev/null +++ b/changes/bug40391 @@ -0,0 +1,9 @@ + o Major bugfixes (security): + - Resist a hashtable-based CPU denial-of-service attack against + relays. Previously we used a naive unkeyed hash function to look up + circuits in a circuitmux object. An attacker could exploit this to + construct circuits with chosen circuit IDs in order to try to create + collisions and make the hash table inefficient. Now we use a SipHash + construction for this hash table instead. Fixes bug 40391; bugfix on + 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005. + Reported by Jann Horn from Google's Project Zero. |