Linux NFS server buffer overflow
| linux-nfs-maxpath-bo (3501) |  High Risk |
Description:
The NFS (Network File System) daemon shipped with many Linux distributions is vulnerable to a buffer overflow. By removing a long directory name in NFS, an attacker can overflow a buffer and execute arbitrary code on the server with root privileges. In order to exploit this vulnerability, an attacker must have previous read and write access to a share offered by a vulnerable NFS server.
Platforms Affected:
- Debian, Debian Linux 2.1
- RedHat, Linux 4.2
- RedHat, Linux 5.2
- SCO, Caldera OpenLinux
Remedy:
For Red Hat Linux:
Upgrade to the latest version of nfs-server (2.2beta47-1 or later), as listed in RHSA1999:053-01. See References.
For Debian Linux:
Upgrade to the latest version of nfs-server (2.2beta37-1slink or later), as listed in Debian Security Advisory 19991111. See References.
For Caldera OpenLinux:
Upgrade to the latest version of nfs-server (2.2beta47-2 or later), as listed in Caldera Systems, Inc. Security Advisory CSSA-1999-033.0. See References.
For SuSE Linux:
Upgrade to the latest version of nkita (99.11.11-0 or later), as listed in SuSE Security Announcement #29. See References.
For Slackware Linux 7.0:
Upgrade to the latest version of nfs-server (2.2beta47 or later), as listed in the BugTraq Mailing List posting dated Tue Nov 30 1999 19:24:35. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
Consequences:
Gain Access
References:
- BugTraq Mailing List, Tue Nov 30 1999 - 21:24:35 CST, [david@slackware.com: New Patches for Slackware 7.0 Available] at http://archives.neohapsis.com/archives/bugtraq/1999-q4/0165.html.
- BugTraq Mailing List, Tue, 9 Nov 1999 11:39:39 +0100, undocumented bugs - nfsd at http://archives.neohapsis.com/archives/bugtraq/1999-q3/1549.html.
- Caldera International, Inc. Security Advisory CSSA-1999-033.0, buffer overflow in NFS daemon at ftp://ftp.caldera.com/pub/security/OpenLinux/CSSA-1999:033.0.txt.
- Debian Security Advisory 19991111, nfs-server: buffer overflow in nfs server at http://www.debian.org/security/1999/19991111.
- Red Hat Linux 5.2 General Errata, new NFS server packages available (5.2, 4.2) at http://www.redhat.com/support/errata/rh52-errata-general.html#nfs.
- SuSE Security Announcement #29, nfs-server < 2.2beta47 within nkita at http://www.suse.de/de/security/suse_security_announce_29.txt.
- BID-782: Linux nfsd Remote Buffer Overflow Vulnerability
- CVE-1999-0832: Buffer overflow in NFS server on Linux allows attackers to execute commands via a long pathname.
Reported:
Nov 09, 1999
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