The remote Scientific Linux host is missing a security update.
The version of vsftpd as shipped in Red Hat Enterprise Linux 4 when
used in combination with Pluggable Authentication Modules (PAM) had a
memory leak on an invalid authentication attempt. Since vsftpd prior
to version 2.0.5 allows any number of invalid attempts on the same
connection this memory leak could lead to an eventual DoS.
This update mitigates this security issue by including a backported
patch which terminates a session after a given number of failed log in
attempts. The default number of attempts is 3 and this can be
configured using the 'max_login_fails' directive.
This package also addresses the following bugs :
- when uploading unique files, a bug in vsftpd caused the
file to be saved with a suffix '.1' even when no
previous file with that name existed. This issues is
resolved in this package.
- when vsftpd was run through the init script, it was
possible for the init script to print an 'OK' message,
even though the vsftpd may not have started. The init
script no longer produces a false verification with this
- vsftpd only supported usernames with a maximum length of
32 characters. The updated package now supports
usernames up to 128 characters long.
- a system flaw meant vsftpd output could become dependent
on the timing or sequence of other events, even when the
'lock_upload_files' option was set. If a file,
filename.ext, was being uploaded and a second transfer
of the file, filename.ext, was started before the first
transfer was finished, the resultant uploaded file was a
corrupt concatenation of the latter upload and the tail
of the earlier upload. With this updated package, vsftpd
allows the earlier upload to complete before overwriting
with the latter upload, fixing the issue.
- the 'lock_upload_files' option was not documented in the
manual page. A new manual page describing this option is
included in this package.
- vsftpd did not support usernames that started with an
underscore or a period character. These special
characters are now allowed at the beginning of a
- when storing a unique file, vsftpd could cause an error
for some clients. This is rectified in this package.
- vsftpd init script was found to not be Linux Standards
Base compliant. This update corrects their exit codes to
conform to the standard.
See also :
Update the affected vsftpd package.
Risk factor :
High / CVSS Base Score : 7.1