Last Comment Bug 500534 - Crash @ [nsImapServerResponseParser::mailbox] with bogus IMAP server
: Crash @ [nsImapServerResponseParser::mailbox] with bogus IMAP server
Status: RESOLVED DUPLICATE of bug 376192
: crash
Product: MailNews Core
Classification: Components
Component: Networking: IMAP (show other bugs)
: 1.8 Branch
: x86 All
-- critical (vote)
: ---
Assigned To: Nobody; OK to take it and work on it
Depends on:
  Show dependency treegraph
Reported: 2009-06-25 15:18 PDT by Brandon Sterne (:bsterne)
Modified: 2009-11-15 06:21 PST (History)
5 users (show)
See Also:
Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---

IMAP server script (2.13 KB, text/plain)
2009-06-25 15:18 PDT, Brandon Sterne (:bsterne)
no flags Details

Description User image Brandon Sterne (:bsterne) 2009-06-25 15:18:35 PDT
Created attachment 385242 [details]
IMAP server script

Steve Kemp <> reported this issue to security@m.o.

I wrote a Python script to emulate the server behavior that the produces the crash in case he needs to take down his test server.  This crashes Thunderbird 2 but doesn't appear to crash Shredder.

To reproduce:
1. Grab the attachment
2. sudo ./ (needs root to bind to port 143)
3. Run Thunderbird 2 and set up a IMAP account with localhost as your
   Incoming Server
4. Enter a password when you are prompted and witness the crash

This is a null dereference crash, but I'm going to hide it initially because I know nothing about the surrounding code.  Feel free to unhide if this is a safe crash.  In the stack trace below you can see that boxSpec->connection->GetCurrentUrl() is null when it is dereferenced.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb1bebb90 (LWP 14059)]
0xb6cb9413 in nsImapServerResponseParser::mailbox (this=0x9882f3c, 
    at /build/tb2/mozilla/mailnews/imap/src/nsImapServerResponseParser.cpp:964
964	    boxSpec->connection->GetCurrentUrl()->AllocateCanonicalPath(boxname, boxSpec->hierarchySeparator, &boxSpec->allocatedPathName);
(gdb) p boxSpec 
$1 = (class nsImapMailboxSpec *) 0x9467fb0
(gdb) p boxSpec->connection
$2 = (class nsImapProtocol *) 0x9882d88
(gdb) p boxSpec->connection->GetCurrentUrl
$3 = {class nsIImapUrl *(
    nsImapProtocol *)} 0xb6cafedc <nsImapProtocol::GetCurrentUrl()>
(gdb) p boxSpec->connection->GetCurrentUrl()
[Thread 0xb450cb90 (LWP 14057) exited]
[Thread 0xb23ecb90 (LWP 14060) exited]
$4 = (class nsIImapUrl *) 0x0

This is preceded by the assertion:

###!!! ASSERTION: box spec has connection with null url: 'boxSpec->connection->GetCurrentUrl()', file /build/tb2/mozilla/mailnews/imap/src/nsImapServerResponseParser.cpp, line 961
Comment 1 User image David :Bienvenu 2009-06-25 15:33:16 PDT
this is a dup of bug 376192 - I'll nominate that fix for 1.8.1 next...afaik, it's a safe crash.
Comment 2 User image Brandon Sterne (:bsterne) 2009-06-25 15:58:34 PDT

*** This bug has been marked as a duplicate of bug 376192 ***
Comment 3 User image Wayne Mery (:wsmwk, NI for questions) 2009-11-15 06:21:26 PST
even closed bugs should get keyword(s), severity, etc appropriate to bug description

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