9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
0.078 Low
EPSS
Percentile
94.2%
GNU wget allows arbitrary filesystem access when creating symbolic links during a recursive FTP download. This allows an attacker to overwrite files with the permissions of the user running wget.
CWE-59:** CWE-59: Improper Link Resolution Before File Access (‘Link Following’)**
Wget is a common Unix utility to retrieve remote files. When wget is running in recursive mode (the -m or -r switch) with a FTP server as the destination, it is vulnerable to a link following attack. A malicious FTP server, when configured to provide symlinks in the directory listing, can force the client wget utility to enter into the the specified local symlink, navigating the local file system for the attacker. Wget will then download and create or overwrite existing files within the local symlink, setting permissions to those of the remote files.
See the Rapid7 advisory for more details.
A remote unauthenticated malicious FTP server, connected to the victim via wget, can create and overwrite arbitrary files in the context of the user running wget.
Apply an Update
This vulnerability is addressed in wget 1.16. Updates should also be available in various package formats for downstream Linux distributions. Check your distribution’s package management system for updates.
Enable wget symlink traversal
In wget versions 1.15 and earlier, configure retr-symlinks=on
in /etc/wgetrc
or ~/.wgetrc
or specify --retr-symlinks
as a command line option to wget.
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Updated: October 28, 2014
Affected
We have not received a statement from the vendor.
We are not aware of further vendor information regarding this vulnerability.
Group | Score | Vector |
---|---|---|
Base | 5.8 | AV:N/AC:M/Au:N/C:N/I:P/A:P |
Temporal | 4.8 | E:F/RL:OF/RC:C |
Environmental | 3.6 | CDP:ND/TD:M/CR:ND/IR:ND/AR:ND |
Thanks to HD Moore and John Hart of Rapid7, Inc. for reporting this vulnerability.
This document was written by Chris King.
CVE IDs: | CVE-2014-4877 |
---|---|
Date Public: | 2014-10-27 Date First Published: |
comments.gmane.org/gmane.comp.web.wget.general/10367
cwe.mitre.org/data/definitions/59.html
git.savannah.gnu.org/cgit/wget.git/commit/?id=18b0979357ed7dc4e11d4f2b1d7e0f5932d82aa7
gnu.huihoo.org/wget-1.8.1/html_node/wget_10.html
www.gnu.org/software/wget/manual/wget.html#index-symbolic-links_002c-retrieving
bugzilla.redhat.com/show_bug.cgi?id=1139181
community.rapid7.com/community/metasploit/blog/2014/10/28/r7-2014-15-gnu-wget-ftp-symlink-arbitrary-filesystem-access