The remote host is running knfsd, a kernel NFS daemon.

There is a vulnerability in this version that may allow an attacker to cause a kernel panic on the remote host by sending a malformed GETATTR request with an invalid length field.

Updated kernel packages that address various security vulnerabilities are now available for Red Hat Enterprise Linux.

The Linux kernel handles the basic functions of the operating system.

Security issues have been found that affect the versions of the Linux kernel shipped with Red Hat Enterprise Linux :

CVE-2003-0462: Paul Starzetz discovered a file read race condition existing in the execve() system call, which could cause a local crash.

CVE-2003-0501: The /proc filesystem in Linux allows local users to obtain sensitive information by opening various entries in /proc/self before executing a setuid program. This causes the program to fail to change the ownership and permissions of already opened entries.

CVE-2003-0550: The STP protocol is known to have no security, which could allow attackers to alter the bridge topology. STP is now turned off by default.

CVE-2003-0551: STP input processing was lax in its length checking, which could lead to a denial of service (DoS).

CVE-2003-0552: Jerry Kreuscher discovered that the Forwarding table could be spoofed by sending forged packets with bogus source addresses the same as the local host.

CVE-2003-0619: An integer signedness error in the decode_fh function of nfs3xdr.c allows remote attackers to cause a denial of service (kernel panic) via a negative size value within XDR data of an NFSv3 procedure call.

CVE-2003-0699: The C-Media PCI sound driver in Linux kernel versions prior to 2.4.21 accesses userspace without using the get_user function, which is a potential security hole.

All users are advised to upgrade to these erratum packages, which contain backported security patches correcting these vulnerabilities.

A number of vulnerabilities have been discovered in the Linux kernel.

  - CAN-2003-0461: /proc/tty/driver/serial in Linux 2.4.x     reveals the exact number of characters used in serial     links, which could allow local users to obtain     potentially sensitive information such as the length of     passwords. This bug has been fixed by restricting access     to /proc/tty/driver/serial.
  - CAN-2003-0462: A race condition in the way env_start and     env_end pointers are initialized in the execve system     call and used in fs/proc/base.c on Linux 2.4 allows     local users to cause a denial of service (crash).

  - CAN-2003-0476: The execve system call in Linux 2.4.x     records the file descriptor of the executable process in     the file table of the calling process, which allows     local users to gain read access to restricted file     descriptors.

  - CAN-2003-0501: The /proc filesystem in Linux allows     local users to obtain sensitive information by opening     various entries in /proc/self before executing a setuid     program, which causes the program to fail to change the     ownership and permissions of those entries.

  - CAN-2003-0550: The STP protocol, as enabled in Linux     2.4.x, does not provide sufficient security by design,     which allows attackers to modify the bridge topology.
    This bug has been fixed by disabling STP by default.

  - CAN-2003-0551: The STP protocol, as enabled in Linux     2.4.x, does not provide sufficient security by design,     which allows attackers to modify the bridge topology.

  - CAN-2003-0552: Linux 2.4.x allows remote attackers to     spoof the bridge forwarding table via forged packets     whose source addresses are the same as the target.

  - CAN-2003-0018: Linux kernel 2.4.10 through 2.4.21-pre4     does not properly handle the O_DIRECT feature, which     allows local attackers with write privileges to read     portions of previously deleted files, or cause file     system corruption. This bug has been fixed by disabling     O_DIRECT.

  - CAN-2003-0619: Integer signedness error in the decode_fh     function of nfs3xdr.c in Linux kernel before 2.4.21     allows remote attackers to cause a denial of service     (kernel panic) via a negative size value within XDR data     of an NFSv3 procedure call.

This advisory covers only the i386 and alpha architectures. Other architectures will be covered by separate advisories.

Updated kernel packages that address various security vulnerabilities
are now available for Red Hat Enterprise Linux.

The Linux kernel handles the basic functions of the operating system.

Security issues have been found that affect the versions of the Linux
kernel shipped with Red Hat Enterprise Linux :

CVE-2003-0462: Paul Starzetz discovered a file read race condition
existing in the execve() system call, which could cause a local crash.

CVE-2003-0501: The /proc filesystem in Linux allows local users to
obtain sensitive information by opening various entries in /proc/self
before executing a setuid program. This causes the program to fail to
change the ownership and permissions of already opened entries.

CVE-2003-0550: The STP protocol is known to have no security, which
could allow attackers to alter the bridge topology. STP is now turned
off by default.

CVE-2003-0551: STP input processing was lax in its length checking,
which could lead to a denial of service (DoS).

CVE-2003-0552: Jerry Kreuscher discovered that the Forwarding table
could be spoofed by sending forged packets with bogus source addresses
the same as the local host.

CVE-2003-0619: An integer signedness error in the decode_fh function
of nfs3xdr.c allows remote attackers to cause a denial of service
(kernel panic) via a negative size value within XDR data of an NFSv3
procedure call.

CVE-2003-0699: The C-Media PCI sound driver in Linux kernel versions
prior to 2.4.21 accesses userspace without using the get_user
function, which is a potential security hole.

All users are advised to upgrade to these erratum packages, which
contain backported security patches correcting these vulnerabilities.

ID	Name	Product	Family	Published	Updated	Severity
11813	Linux 2.4 NFSv3 knfsd Malformed GETATTR Request Remote DoS	Nessus	Denial of Service	8/1/2003	11/15/2018	high
12410	RHEL 2.1 : kernel (RHSA-2003:239)	Nessus	Red Hat Local Security Checks	7/6/2004	1/14/2021	high
15195	Debian DSA-358-4 : linux-kernel-2.4.18 - several vulnerabilities	Nessus	Debian Local Security Checks	9/29/2004	1/4/2021	medium
801582	Red Hat 2003-239 Security Check	Log Correlation Engine	Generic			high

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