WU-FTPD bypass restricted-gid option allows unauthorized access
| wuftpd-restrictedgid-gain-access (15423) |  High Risk |
Description:
Washington University's FTP daemon (WU-FTPD) could allow a remote attacker to gain unauthorized access to the root directory. A remote attacker, who is authenticated, can use chmod to change the permissions on the home directory to deny himself access. When the attacker logs in, WU-FTPD will bypass restrictions on the restricted-gid option and allow the attacker to gain unauthorized access to the root FTP directory.
Platforms Affected:
- Compaq, Tru64 5.1a
- Compaq, Tru64 5.1b
- Debian, Debian Linux 3.0
- HP, HP-UX 11.00
- HP, HP-UX 11.11
- HP, HP-UX 11.22
- HP, HP-UX 11.23
- RedHat, Enterprise Linux 2.1 ES
- RedHat, Enterprise Linux 2.1 AS
- RedHat, Enterprise Linux 2.1 AW
- RedHat, Linux Advanced Workstation 2.1 Itanium
- SGI, ProPack 2.3
- SGI, ProPack 2.4
- Sun, Solaris 9 SPARC
- Sun, Solaris 9 x86
- Turbolinux, Turbolinux Advanced Server 6
- Turbolinux, Turbolinux Server 6.1
- Turbolinux, Turbolinux Workstation 6.0
- Washington University, WU-FTPD 2.4.1
- Washington University, WU-FTPD 2.4.2 Beta18 Academ
- Washington University, WU-FTPD 2.4.2 Beta18 VR10
- Washington University, WU-FTPD 2.4.2 Beta18 VR11
- Washington University, WU-FTPD 2.4.2 Beta18 VR12
- Washington University, WU-FTPD 2.4.2 Beta18 VR13
- Washington University, WU-FTPD 2.4.2 Beta18 VR14
- Washington University, WU-FTPD 2.4.2 Beta18 VR15
- Washington University, WU-FTPD 2.4.2 Beta18 VR4
- Washington University, WU-FTPD 2.4.2 Beta18 VR5
- Washington University, WU-FTPD 2.4.2 Beta18 VR6
- Washington University, WU-FTPD 2.4.2 Beta18 VR7
- Washington University, WU-FTPD 2.4.2 Beta18 VR8
- Washington University, WU-FTPD 2.4.2 Beta18 VR9
- Washington University, WU-FTPD 2.4.2 Beta2 Academ
- Washington University, WU-FTPD 2.4.2 VR16
- Washington University, WU-FTPD 2.4.2 VR17
- Washington University, WU-FTPD 2.5
- Washington University, WU-FTPD 2.6.0
- Washington University, WU-FTPD 2.6.1
- Washington University, WU-FTPD 2.6.2
Remedy:
For Debian GNU/Linux 3.0 (woody):
Upgrade to the latest wu-ftpd package (2.6.2-3woody4 or later), as listed in DSA-457-1. See References.
For Red Hat Linux:
Upgrade to the latest wu-ftpd package, as listed below. Refer to RHSA-2004:096-09 for more information. See References.
Red Hat Enterprise Linux AS (v. 2.1), ES (v. 2.1), and Advanced Workstation for the Itanium Processor (v. 2.6.1-22)
For HP Tru64 UNIX 5.1A and 5.1B:
Apply the appropriate Early Release Patches (ERPs) for your system, as listed in Tru64 Security Bulletin: SSRT4704 and SSRT4705. See References.
For HP-UX 11.00, 11.11, 11.22, and 11.23:
Apply the appropriate patch for this vulnerability, as listed in Hewlett-Packard Security Bulletin HPSBUX01059. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
Consequences:
Gain Access
References:
- CIAC Information Bulletin 0-119, HP Tru64 UNIX WU-FTPD Security Vulnerabilities at http://www.ciac.org/ciac/bulletins/o-119.shtml.
- CIAC Information Bulletin O-095, wu-ftpd 'chmod' and S/Key Vulnerabilities at http://www.ciac.org/ciac/bulletins/o-095.shtml.
- Sun Alert ID: 102356, Security Vulnerability in the Solaris 9 in.ftpd(1M) Server May Allow Unauthorized Directory Access at http://sunsolve.sun.com/search/document.do?assetkey=1-26-102356-1.
- ASA-2006-132: Sun Alert Notifications from Sun Weekly Report dated May 20 2006
- BID-9832: WU-FTPD restricted-gid Unauthorized Access Vulnerability
- CVE-2004-0148: wu-ftpd 2.6.2 and earlier, with the restricted-gid option enabled, allows local users to bypass access restrictions by changing the permissions to prevent access to their home directory, which causes wu-ftpd to use the root directory instead.
- DSA-457: wu-ftpd -- several vulnerabilities
- RHSA-2004-096: wu-ftpd security update
- SA11055: WU-FTPD Directory Access Restriction Bypass Vulnerability
- SA20168: Solaris in.ftpd Directory Access Restriction Bypass Vulnerability
Reported:
Mar 08, 2004
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