Package: transmission-daemon
Version: 2.52-3
Severity: grave
Tags: security patch upstream
Justification: user security hole
The transmission-daemon package in wheezy crashes regularly. According
to upstream this is a remote security hole (at least a remote DoS, but
most probably there is a way to take control of the process).
https://trac.transmissionbt.com/ticket/5044
https://trac.transmissionbt.com/ticket/5002
Apparently there is no CVE assigned. The bug is fixed upstream and I’m
attaching the patch. I’m currently testing a patched package, and will
report whether the fix is sufficient.
Cheers,
--
.''`. Josselin Mouette
: :' :
`. `'
`-
Index: trunk/third-party/libutp/utp.cpp
===================================================================
--- trunk/third-party/libutp/utp.cpp (revision 13645)
+++ trunk/third-party/libutp/utp.cpp (revision 13646)
@@ -1488,4 +1488,6 @@
}
+enum { MAX_EACK = 128 };
+
void UTPSocket::selective_ack(uint base, const byte *mask, byte len)
{
@@ -1500,5 +1502,5 @@
// iterate in reverse over the acked packets, at the end, the top packets
// are the ones we want to resend
- int resends[32];
+ int resends[MAX_EACK];
int nr = 0;
@@ -1573,4 +1575,10 @@
count >= DUPLICATE_ACKS_BEFORE_RESEND &&
duplicate_ack < DUPLICATE_ACKS_BEFORE_RESEND) {
+ // resends is a stack, and we're mostly interested in the top of it
+ // if we're full, just throw away the lower half
+ if (nr >= MAX_EACK - 2) {
+ memmove(resends, &resends[MAX_EACK/2], MAX_EACK/2 * sizeof(resends[0]));
+ nr -= MAX_EACK / 2;
+ }
resends[nr++] = v;
LOG_UTPV("0x%08x: no ack for %u", this, v);
@@ -1581,11 +1589,10 @@
} while (--bits >= -1);
- if (((base - 1 - fast_resend_seq_nr) & ACK_NR_MASK) < 256 &&
- count >= DUPLICATE_ACKS_BEFORE_RESEND &&
- duplicate_ack < DUPLICATE_ACKS_BEFORE_RESEND) {
+ if (((base - 1 - fast_resend_seq_nr) & ACK_NR_MASK) <= OUTGOING_BUFFER_MAX_SIZE &&
+ count >= DUPLICATE_ACKS_BEFORE_RESEND) {
// if we get enough duplicate acks to start
// resending, the first packet we should resend
// is base-1
- resends[nr++] = base - 1;
+ resends[nr++] = (base - 1) & ACK_NR_MASK;
} else {
LOG_UTPV("0x%08x: not resending %u count:%d dup_ack:%u fast_resend_seq_nr:%u",
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