preferences of a user modified with preferences of another user (on 2 different computers)

Last weekend, a customer (USER1) reported that, when he sent an email to 
another person, the "From" field was the email of another user (USER2).

I verified his configuration and I saw that his preferences 
(.../data/userId.pref) were changed : he had the preferences of USER2.
These two users don't know each other. They were on different computers.

We have :

System redhat Enterprise 4
Squirrelmail 1.4.17
plugins : avelsieve, newmail, quota_usage, quicksave, compatibility

imap server: Cyrus imapd 2.2.12-9
smtp server: postfix 2.2.10-1.2.1.el4_7
web server: Apache 2.0.52-41.ent.2

browser (of the user who sent the mail with the wrong "From" field) : 
Firefox 3(he don't remember if he worked on Linux or windows. )

It's the only problem reported since the installation of this version of 
squirrelMail : 9 DEC. 2008 and I don't know how I could reproduce it.

Here are all te informations I collected  on our server :

the modification date of the file : USER1.pref was:  Sat, 21 Mar 2009 
15:26 (full name, email address and reply_to where modified)

Here are the logs for  USER1 for this day :

Mar 21 11:39:16 omel lmtp[8605]: IOERROR: fstating sieve script 
/mnt/cyrus/sieve/p/USER1/defaultbc: No such file or directory
Mar 21 11:39:36 omel imap[2997]: skiplist: checkpointed 
/mnt/cyrus/imap/user/p/USER1.seen (27 records, 6036 bytes) in 0 seconds
Mar 21 12:45:06 omel lmtp[6629]: IOERROR: fstating sieve script 
/mnt/cyrus/sieve/p/USER1/defaultbc: No such file or directory
Mar 21 15:26:35 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:26:36 omel imaps[27596]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:26:36 omel imaps[27596]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:26:36 omel imaps[27596]: open: user USER1 opened Trash
Mar 21 15:26:36 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:26:36 omel imaps[26853]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:26:36 omel imaps[26853]: open: user USER1 opened INBOX
Mar 21 15:26:36 omel imaps[26853]: open: user USER1 opened INBOX
Mar 21 15:26:36 omel imaps[26853]: open: user USER1 opened INBOX
Mar 21 15:26:42 omel imaps[27715]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:26:42 omel imaps[27715]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:26:42 omel imaps[27715]: open: user USER1 opened INBOX
Mar 21 15:26:42 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:26:42 omel imaps[26853]: skiplist: checkpointed 
/mnt/cyrus/imap/user/p/USER1.seen (27 records, 6036 bytes) in 0 seconds
Mar 21 15:26:42 omel imaps[26853]: open: user USER1 opened INBOX
Mar 21 15:26:47 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:26:47 omel imaps[26853]: open: user USER1 opened INBOX
Mar 21 15:27:54 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:27:55 omel imaps[26853]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:27:55 omel imaps[26853]: open: user USER1 opened Sent
Mar 21 15:27:55 omel imaps[26853]: open: user USER1 opened Sent
Mar 21 15:27:55 omel imaps[26853]: open: user USER1 opened Sent
Mar 21 15:27:58 omel imaps[30199]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:27:58 omel imaps[30199]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:27:58 omel imaps[30199]: open: user USER1 opened Sent
Mar 21 15:30:19 omel imaps[27596]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:30:19 omel imaps[27596]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:30:19 omel imaps[27596]: open: user USER1 opened Sent
Mar 21 15:30:19 omel imaps[27596]: open: user USER1 opened Sent
Mar 21 15:30:19 omel imaps[27596]: open: user USER1 opened Sent
Mar 21 15:30:23 omel imaps[6128]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:30:23 omel imaps[6128]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:30:23 omel imaps[6128]: open: user USER1 opened Sent
Mar 21 15:30:27 omel imaps[27596]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:30:27 omel imaps[27596]: open: user USER1 opened Sent
Mar 21 15:30:52 omel imaps[27596]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:30:52 omel imaps[27596]: open: user USER1 opened Sent
Mar 21 15:30:52 omel imaps[27596]: open: user USER1 opened Sent
Mar 21 15:30:52 omel imaps[27596]: open: user USER1 opened Sent
Mar 21 15:30:53 omel imaps[3495]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:30:53 omel imaps[3495]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:30:53 omel imaps[3495]: open: user USER1 opened Sent
Mar 21 15:30:55 omel imaps[27596]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:30:55 omel imaps[27596]: open: user USER1 opened Sent
Mar 21 15:31:04 omel imaps[3933]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:31:04 omel imaps[3933]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:31:04 omel imaps[3933]: open: user USER1 opened Sent
Mar 21 15:31:07 omel imaps[3946]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:31:07 omel imaps[3946]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:31:07 omel imaps[3946]: open: user USER1 opened Sent
Mar 21 15:31:10 omel imaps[3933]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:31:10 omel imaps[3933]: open: user USER1 opened Sent
Mar 21 15:31:36 omel imaps[11764]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:31:36 omel imaps[11764]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:31:36 omel imaps[11764]: open: user USER1 opened Trash
Mar 21 15:32:36 omel imaps[4208]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:32:36 omel imaps[4208]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:32:36 omel imaps[4208]: open: user USER1 opened INBOX
Mar 21 15:36:37 omel imaps[13145]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:36:37 omel imaps[13145]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:36:37 omel imaps[13145]: open: user USER1 opened Trash
Mar 21 15:39:15 omel imaps[21288]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:39:15 omel imaps[21288]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:39:15 omel imaps[21288]: open: user USER1 opened INBOX
Mar 21 15:39:15 omel imaps[12724]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:39:15 omel imaps[12724]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:39:15 omel imaps[12724]: skiplist: checkpointed 
/mnt/cyrus/imap/user/p/USER1.seen (27 records, 6040 bytes) in 0 seconds
Mar 21 15:39:15 omel imaps[12724]: open: user USER1 opened INBOX
Mar 21 15:39:15 omel imaps[12724]: open: user USER1 opened INBOX
Mar 21 15:39:15 omel imaps[12724]: seen_db: user USER1 opened 
/mnt/cyrus/imap/user/p/USER1.seen
Mar 21 15:39:16 omel imaps[21288]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:39:16 omel imaps[21288]: open: user USER1 opened INBOX
Mar 21 15:39:22 omel imaps[12724]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER1 plaintext+TLS User logged in
Mar 21 15:39:22 omel imaps[12724]: open: user USER1 opened INBOX
Mar 21 22:58:03 omel lmtp[7165]: IOERROR: fstating sieve script 
/mnt/cyrus/sieve/p/USER1/defaultbc: No such file or directory
Mar 21 22:58:36 omel imap[2997]: skiplist: checkpointed 
/mnt/cyrus/imap/user/p/USER1.seen (27 records, 6040 bytes) in 0 seconds



and the logs for  USER2 :


Mar 21 11:07:54 omel lmtp[17384]: IOERROR: fstating sieve script 
/mnt/cyrus/sieve/s/USER2/defaultbc: No such file or directory
Mar 21 11:33:30 omel imaps[7063]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 11:33:30 omel imaps[6254]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 11:33:30 omel imaps[6254]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 11:33:31 omel imaps[6254]: open: user USER2 opened Trash
Mar 21 11:33:31 omel imaps[10979]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 11:33:31 omel imaps[10979]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 11:33:31 omel imaps[10979]: open: user USER2 opened INBOX
Mar 21 11:33:40 omel imaps[6254]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 11:33:40 omel imaps[6254]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 11:33:40 omel imaps[6254]: open: user USER2 opened INBOX
Mar 21 11:38:31 omel imaps[29950]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 11:38:31 omel imaps[29950]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 11:38:31 omel imaps[29950]: open: user USER2 opened Trash
Mar 21 12:28:03 omel lmtp[6629]: IOERROR: fstating sieve script 
/mnt/cyrus/sieve/s/USER2/defaultbc: No such file or directory
Mar 21 16:15:16 omel lmtp[26845]: IOERROR: fstating sieve script 
/mnt/cyrus/sieve/s/USER2/defaultbc: No such file or directory
Mar 21 18:12:09 omel imaps[19349]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:12:09 omel imaps[19909]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:12:09 omel imaps[19909]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:12:09 omel imaps[19909]: open: user USER2 opened Trash
Mar 21 18:12:10 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:12:10 omel imaps[26853]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:12:10 omel imaps[26853]: open: user USER2 opened INBOX
Mar 21 18:12:15 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:12:15 omel imaps[26853]: open: user USER2 opened INBOX
Mar 21 18:12:36 omel imaps[19349]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:12:36 omel imaps[19349]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:12:36 omel imaps[19349]: open: user USER2 opened INBOX
Mar 21 18:12:41 omel imaps[23183]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:12:41 omel imaps[23183]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:12:41 omel imaps[23183]: open: user USER2 opened Sent
Mar 21 18:12:45 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:12:45 omel imaps[26853]: open: user USER2 opened INBOX
Mar 21 18:12:47 omel imaps[23183]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:12:47 omel imaps[23183]: open: user USER2 opened INBOX
Mar 21 18:13:13 omel imaps[19909]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:13:13 omel imaps[19909]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:13:13 omel imaps[19909]: open: user USER2 opened INBOX
Mar 21 18:14:39 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:14:39 omel imaps[26853]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:14:39 omel imaps[26853]: open: user USER2 opened INBOX
Mar 21 18:14:39 omel imaps[19349]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:14:39 omel imaps[19349]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:14:39 omel imaps[19349]: open: user USER2 opened INBOX
Mar 21 18:14:39 omel imaps[19349]: open: user USER2 opened INBOX
Mar 21 18:14:39 omel imaps[19349]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:14:39 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:14:39 omel imaps[26853]: open: user USER2 opened INBOX
Mar 21 18:14:41 omel imaps[19909]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:14:41 omel imaps[19909]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:14:41 omel imaps[19909]: open: user USER2 opened INBOX
Mar 21 18:14:57 omel imaps[25042]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:14:57 omel imaps[25042]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:14:57 omel imaps[25042]: open: user USER2 opened INBOX
Mar 21 18:15:01 omel imaps[26853]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:15:01 omel imaps[26853]: open: user USER2 opened INBOX
Mar 21 18:15:06 omel imaps[19909]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:15:06 omel imaps[19909]: open: user USER2 opened INBOX
Mar 21 18:15:06 omel imaps[19909]: seen_db: user USER2 opened 
/mnt/cyrus/imap/user/s/USER2.seen
Mar 21 18:15:06 omel imaps[25042]: login: mail.domain.fr 
[XXX.XXX.XXX.XXX] USER2 plaintext+TLS User logged in
Mar 21 18:15:06 omel imaps[25042]: open: user USER2 opened INBOX
Mar 21 18:15:06 omel imaps[25042]: open: user USER2 opened INBOX
Mar 21 18:15:06 omel imaps[25042]: open: user USER2 opened INBOX
Mar 22 02:42:57 omel lmtp[17988]: IOERROR: fstating sieve script 
/mnt/cyrus/sieve/s/USER2/defaultbc: No such file or directory

USER2 is nearly allways connected to SquirrelMail, he doesn't use 
another mail client.

I know that I haven't a lot of informations about his problem for you 
but I wanted to confirm that this problem of informations merged between 
2 users on 2 different computers may happen with squirrelMail 1.4.17

Best regards

Annie


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