Synopsis

Low: lftp security and bug fix update

Type/Severity

Security Advisory: Low

Topic

An updated lftp package that fixes one security issue and various bugs is
now available for Red Hat Enterprise Linux 5.

This update has been rated as having low security impact by the Red Hat
Security Response Team.

Description

LFTP is a sophisticated file transfer program for the FTP and HTTP
protocols. Like bash, it has job control and uses the readline library for
input. It has bookmarks, built-in mirroring, and can transfer several files
in parallel. It is designed with reliability in mind.

It was discovered that lftp did not properly escape shell metacharacters
when generating shell scripts using the "mirror --script" command. A
mirroring script generated to download files from a malicious FTP server
could allow an attacker controlling the FTP server to run an arbitrary
command as the user running lftp. (CVE-2007-2348)

This update also fixes the following bugs:

• when using the "mirror" or "get" commands with the "-c" option, lftp did
  not check for some specific conditions that could result in the program
  becoming unresponsive, hanging and the command not completing. For example,
  when waiting for a directory listing, if lftp received a "226" message,
  denoting an empty directory, it previously ignored the message and kept
  waiting. With this update, these conditions are properly checked for and
  lftp no longer hangs when "-c" is used with "mirror" or "get". (BZ#422881)
  
• when using the "put", "mput" or "reput" commands over a Secure FTP (SFTP)
  connection, specifying the "-c" option sometimes resulted in corrupted
  files of incorrect size. With this update, using these commands over SFTP
  with the "-c" option works as expected, and transferred files are no
  longer corrupted in the transfer process. (BZ#434294)
  
• previously, LFTP linked to the OpenSSL library. OpenSSL's license is,
  however, incompatible with LFTP's GNU GPL license and LFTP does not include
  an exception allowing OpenSSL linking. With this update, LFTP links to the
  GnuTLS (GNU Transport Layer Security) library, which is released under the
  GNU LGPL license. Like OpenSSL, GnuTLS implements the SSL and TLS
  protocols, so functionality has not changed. (BZ#458777)
  
• running "help mirror" from within lftp only presented a sub-set of the
  available options compared to the full list presented in the man page. With
  this update, running "help mirror" in lftp presents the same list of mirror
  options as is available in the Commands section of the lftp man page.
  (BZ#461922)
  
• LFTP imports gnu-lib from upstream. Subsequent to gnu-lib switching from
  GNU GPLv2 to GNU GPLv3, the LFTP license was internally inconsistent, with
  LFTP licensed as GNU GPLv2 but portions of the package apparently licensed
  as GNU GPLv3 because of changes made by the gnu-lib import. With this
  update, LFTP itself switches to GNU GPLv3, resolving the inconsistency.
  (BZ#468858)
  
• when the "ls" command was used within lftp to present a directory listing
  on a remote system connected to via HTTP, file names containing spaces were
  presented incorrectly. This update corrects this behavior. (BZ#504591)
  
• the default alias "edit" did not define a default editor. If EDITOR was
  not set in advance by the system, lftp attempted to execute
  "~/.lftp/edit.tmp.$$" (which failed because the file is not set to
  executable). The edit alias also did not support tab-completion of file
  names and incorrectly interpreted file names containing spaces. The updated
  package defines a default editor (vi) in the absence of a system-defined
  EDITOR. The edit alias now also supports tab-completion and handles file
  names containing spaces correctly for both downloading and uploading.
  (BZ#504594)
  

Note: This update upgrades LFTP from version 3.7.3 to upstream version
3.7.11, which incorporates a number of further bug fixes to those noted
above. For details regarding these fixes, refer to the
"/usr/share/doc/lftp-3.7.11/NEWS" file after installing this update.
(BZ#308721)

All LFTP users are advised to upgrade to this updated package, which
resolves these issues.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 236238 - CVE-2007-2348 lftp mirror --script does not escape names and targets of symbolic links
• BZ - 239334 - lftp affected by problems described in CVE-2007-2348
• BZ - 308721 - bump lftp to current version 3.7.11
• BZ - 422881 - Using lftp with -c options causes hangs
• BZ - 434294 - lftp corrupts data when using (m)put's -c option on sftp transport
• BZ - 461922 - [RHEL 5] lftp 'help mirror' does not display all options defined in manpage.

CVEs

• CVE-2007-2348

References

• http://www.redhat.com/security/updates/classification/#low

Red Hat Enterprise Linux Server 5

SRPM
lftp-3.7.11-4.el5.src.rpm	SHA-256: 9cbfd04e42a32b9c82abec550d6ac1956f1efc214d41465fdbe5e406fea19e2c
x86_64
lftp-3.7.11-4.el5.x86_64.rpm	SHA-256: 16d006d876a1f8a17d1e32fde337dbc3f7ba61f0ac4b86bf5e4735f11b3c47ba
ia64
lftp-3.7.11-4.el5.ia64.rpm	SHA-256: ab7ebf9bc33bda15b9dd3d81d18449d00da63b9fb486db206a1f43bdd296d8e7
i386
lftp-3.7.11-4.el5.i386.rpm	SHA-256: b146204399f0c3af41bca3a78e8fe28960882af6b51c319df5a6abecfdcd1532

Red Hat Enterprise Linux Workstation 5

SRPM
lftp-3.7.11-4.el5.src.rpm	SHA-256: 9cbfd04e42a32b9c82abec550d6ac1956f1efc214d41465fdbe5e406fea19e2c
x86_64
lftp-3.7.11-4.el5.x86_64.rpm	SHA-256: 16d006d876a1f8a17d1e32fde337dbc3f7ba61f0ac4b86bf5e4735f11b3c47ba
i386
lftp-3.7.11-4.el5.i386.rpm	SHA-256: b146204399f0c3af41bca3a78e8fe28960882af6b51c319df5a6abecfdcd1532

Red Hat Enterprise Linux Desktop 5

SRPM
lftp-3.7.11-4.el5.src.rpm	SHA-256: 9cbfd04e42a32b9c82abec550d6ac1956f1efc214d41465fdbe5e406fea19e2c
x86_64
lftp-3.7.11-4.el5.x86_64.rpm	SHA-256: 16d006d876a1f8a17d1e32fde337dbc3f7ba61f0ac4b86bf5e4735f11b3c47ba
i386
lftp-3.7.11-4.el5.i386.rpm	SHA-256: b146204399f0c3af41bca3a78e8fe28960882af6b51c319df5a6abecfdcd1532

Red Hat Enterprise Linux for IBM z Systems 5

SRPM
lftp-3.7.11-4.el5.src.rpm	SHA-256: 9cbfd04e42a32b9c82abec550d6ac1956f1efc214d41465fdbe5e406fea19e2c
s390x
lftp-3.7.11-4.el5.s390x.rpm	SHA-256: 3008013662858f0373156c406fa15fcb9d65ca8085f22b4a5654f582336bfd5f

Red Hat Enterprise Linux for Power, big endian 5

SRPM
lftp-3.7.11-4.el5.src.rpm	SHA-256: 9cbfd04e42a32b9c82abec550d6ac1956f1efc214d41465fdbe5e406fea19e2c
ppc
lftp-3.7.11-4.el5.ppc.rpm	SHA-256: e14c1dbe2c730dba593288bc46dacba17bf90919868708485983c9db88b37fec

Red Hat Enterprise Linux Server from RHUI 5

SRPM
lftp-3.7.11-4.el5.src.rpm	SHA-256: 9cbfd04e42a32b9c82abec550d6ac1956f1efc214d41465fdbe5e406fea19e2c
x86_64
lftp-3.7.11-4.el5.x86_64.rpm	SHA-256: 16d006d876a1f8a17d1e32fde337dbc3f7ba61f0ac4b86bf5e4735f11b3c47ba
i386
lftp-3.7.11-4.el5.i386.rpm	SHA-256: b146204399f0c3af41bca3a78e8fe28960882af6b51c319df5a6abecfdcd1532