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| author | Nick Mathewson <nickm@torproject.org> | 2021-06-10 08:41:59 -0400 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2021-06-10 08:41:59 -0400 |
| commit | d71bf986b4faf7cb3b654192bc67d5b674cfcf02 (patch) | |
| tree | a8561ec2c8d14fff48bde16a1b90acffe5c83f59 /changes | |
| parent | 7fdfc2ea5470c572a113321e19cdb5144b10cdd8 (diff) | |
| parent | 4c06c619faceb5d158a725d97fda45cadb2cf9c9 (diff) | |
| download | tor-d71bf986b4faf7cb3b654192bc67d5b674cfcf02.tar.gz tor-d71bf986b4faf7cb3b654192bc67d5b674cfcf02.zip | |
Merge branch 'bug40391_035' into maint-0.3.5
Diffstat (limited to 'changes')
| -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. |