mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-30 23:53:32 +01:00
a16902b9d4
In dnsserv_resolved(), we carefully made a nul-terminated copy of the
answer in a PTR RESOLVED cell... then never used that nul-terminated
copy. Ouch.
Surprisingly this one isn't as huge a security problem as it could be.
The only place where the input to dnsserv_resolved wasn't necessarily
nul-terminated was when it was called indirectly from relay.c with the
contents of a relay cell's payload. If the end of the payload was
filled with junk, eventdns.c would take the strdup() of the name [This
part is bad; we might crash there if the cell is in a bad part of the
stack or the heap] and get a name of at least length
495[*]. eventdns.c then rejects any name of length over 255, so the
bogus data would be neither transmitted nor altered.
[*] If the name was less than 495 bytes long, the client wouldn't
actually be reading off the end of the cell.
Nonetheless this is a reasonably annoying bug. Better fix it.
Found while looking at bug 2332, reported by doorss. Bugfix on
0.2.0.1-alpha.
5 lines
190 B
Plaintext
5 lines
190 B
Plaintext
o Minor bugfixes
|
|
- Fix a bug with handling misformed replies to reverse DNS lookup
|
|
requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a bug
|
|
reported by doorss.
|