The TCP/IP fragment reassembly handling in the Linux kernel 2.4 allows remote attackers to cause a denial of service (CPU consumption) via certain packets that cause a large number of hash table collisions.

Several security related problems have been fixed in the Linux kernel 2.4.17 used for the S/390 architecture, mostly by backporting fixes from 2.4.18 and incorporating recent security fixes. The corrections are listed below with the identification from the Common Vulnerabilities and Exposures (CVE) project :

  - CVE-2002-0429 :
    The iBCS routines in arch/i386/kernel/traps.c for Linux     kernels 2.4.18 and earlier on x86 systems allow local     users to kill arbitrary processes via a binary     compatibility interface (lcall).

  - CAN-2003-0001 :

    Multiple ethernet network interface card (NIC) device     drivers do not pad frames with null bytes, which allows     remote attackers to obtain information from previous     packets or kernel memory by using malformed packets, as     demonstrated by Etherleak.

  - CAN-2003-0244 :

    The route cache implementation in Linux 2.4, and the     Netfilter IP conntrack module, allows remote attackers     to cause a denial of service (CPU consumption) via     packets with forged source addresses that cause a large     number of hash table collisions related to the     PREROUTING chain.

  - CAN-2003-0246 :

    The ioperm system call in Linux kernel 2.4.20 and     earlier does not properly restrict privileges, which     allows local users to gain read or write access to     certain I/O ports.

  - CAN-2003-0247 :

    A vulnerability in the TTY layer of the Linux kernel 2.4     allows attackers to cause a denial of service ('kernel     oops').

  - CAN-2003-0248 :

    The mxcsr code in Linux kernel 2.4 allows attackers to     modify CPU state registers via a malformed address.

  - CAN-2003-0364 :

    The TCP/IP fragment reassembly handling in the Linux     kernel 2.4 allows remote attackers to cause a denial of     service (CPU consumption) via certain packets that cause     a large number of hash table collisions.

  - CAN-2003-0961 :

    An integer overflow in brk() system call (do_brk()     function) for Linux allows a local attacker to gain root     privileges. Fixed upstream in Linux 2.4.23.

  - CAN-2003-0985 :

    Paul Starzetz discovered a flaw in bounds checking in     mremap() in the Linux kernel (present in version 2.4.x     and 2.6.x) which may allow a local attacker to gain root     privileges. Version 2.2 is not affected by this bug.
    Fixed upstream in Linux 2.4.24.

  - CAN-2004-0077 :

    Paul Starzetz and Wojciech Purczynski of isec.pl     discovered a critical security vulnerability in the     memory management code of Linux inside the mremap(2)     system call. Due to missing function return value check     of internal functions a local attacker can gain root     privileges. Fixed upstream in Linux 2.4.25 and 2.6.3.

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

  - CAN-2002-1380: Linux kernel 2.2.x allows local users to     cause a denial of service (crash) by using the mmap()     function with a PROT_READ parameter to access     non-readable memory pages through the /proc/pid/mem     interface.
  - CVE-2002-0429: The iBCS routines in     arch/i386/kernel/traps.c for Linux kernels 2.4.18 and     earlier on x86 systems allow local users to kill     arbitrary processes via a binary compatibility interface     (lcall)

  - CAN-2003-0001: Multiple ethernet Network Interface Card     (NIC) device drivers do not pad frames with null bytes,     which allows remote attackers to obtain information from     previous packets or kernel memory by using malformed     packets

  - CAN-2003-0127: The kernel module loader allows local     users to gain root privileges by using ptrace to attach     to a child process that is spawned by the kernel

  - CAN-2003-0244: The route cache implementation in Linux     2.4, and the Netfilter IP conntrack module, allows     remote attackers to cause a denial of service (CPU     consumption) via packets with forged source addresses     that cause a large number of hash table collisions     related to the PREROUTING chain

  - CAN-2003-0246: The ioperm system call in Linux kernel     2.4.20 and earlier does not properly restrict     privileges, which allows local users to gain read or     write access to certain I/O ports.

  - CAN-2003-0247: vulnerability in the TTY layer of the     Linux kernel 2.4 allows attackers to cause a denial of     service ('kernel oops')

  - CAN-2003-0248: The mxcsr code in Linux kernel 2.4 allows     attackers to modify CPU state registers via a malformed     address.

  - CAN-2003-0364: The TCP/IP fragment reassembly handling     in the Linux kernel 2.4 allows remote attackers to cause     a denial of service (CPU consumption) via certain     packets that cause a large number of hash table     collisions

This advisory provides updated 2.2.20 kernel source, and binary kernel images for the i386 architecture. Other architectures and kernel versions will be covered by separate advisories.

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

  - CVE-2002-0429: The iBCS routines in     arch/i386/kernel/traps.c for Linux kernels 2.4.18 and     earlier on x86 systems allow local users to kill     arbitrary processes via a binary compatibility interface     (lcall)
  - CAN-2003-0001: Multiple ethernet Network Interface Card     (NIC) device drivers do not pad frames with null bytes,     which allows remote attackers to obtain information from     previous packets or kernel memory by using malformed     packets

  - CAN-2003-0127: The kernel module loader allows local     users to gain root privileges by using ptrace to attach     to a child process that is spawned by the kernel

  - CAN-2003-0244: The route cache implementation in Linux     2.4, and the Netfilter IP conntrack module, allows     remote attackers to cause a denial of service (CPU     consumption) via packets with forged source addresses     that cause a large number of hash table collisions     related to the PREROUTING chain

  - CAN-2003-0246: The ioperm system call in Linux kernel     2.4.20 and earlier does not properly restrict     privileges, which allows local users to gain read or     write access to certain I/O ports.

  - CAN-2003-0247: vulnerability in the TTY layer of the     Linux kernel 2.4 allows attackers to cause a denial of     service ('kernel oops')

  - CAN-2003-0248: The mxcsr code in Linux kernel 2.4 allows     attackers to modify CPU state registers via a malformed     address.

  - CAN-2003-0364: The TCP/IP fragment reassembly handling     in the Linux kernel 2.4 allows remote attackers to cause     a denial of service (CPU consumption) via certain     packets that cause a large number of hash table     collisions

This advisory provides corrected source code for Linux 2.4.17, and corrected binary kernel images for the mips and mipsel architectures.
Other versions and architectures will be covered by separate advisories.

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

CVE-2002-0429: The iBCS routines in arch/i386/kernel/traps.c for Linux kernels 2.4.18 and earlier on x86 systems allow local users to kill arbitrary processes via a binary compatibility interface (lcall).

CAN-2003-0001: Multiple ethernet Network Interface Card (NIC) device drivers do not pad frames with null bytes, which allows remote attackers to obtain information from previous packets or kernel memory by using malformed packets.

CAN-2003-0127: The kernel module loader allows local users to gain root privileges by using ptrace to attach to a child process that is spawned by the kernel.

CAN-2003-0244: The route cache implementation in Linux 2.4, and the Netfilter IP conntrack module, allows remote attackers to cause a denial of service (CPU consumption) via packets with forged source addresses that cause a large number of hash table collisions related to the PREROUTING chain.

CAN-2003-0246: The ioperm system call in Linux kernel 2.4.20 and earlier does not properly restrict privileges, which allows local users to gain read or write access to certain I/O ports.

CAN-2003-0247: Vulnerability in the TTY layer of the Linux kernel 2.4 allows attackers to cause a denial of service ('kernel oops').

CAN-2003-0248: The mxcsr code in Linux kernel 2.4 allows attackers to modify CPU state registers via a malformed address.

CAN-2003-0364: The TCP/IP fragment reassembly handling in the Linux kernel 2.4 allows remote attackers to cause a denial of service (CPU consumption) via certain packets that cause a large number of hash table collisions.

This advisory covers only the powerpc architecture. Other architectures will be covered by separate advisories.

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

CVE-2002-0429: The iBCS routines in arch/i386/kernel/traps.c for Linux kernels 2.4.18 and earlier on x86 systems allow local users to kill arbitrary processes via a binary compatibility interface (lcall).

CAN-2003-0001: Multiple ethernet Network Interface Card (NIC) device drivers do not pad frames with null bytes, which allows remote attackers to obtain information from previous packets or kernel memory by using malformed packets.

CAN-2003-0127: The kernel module loader allows local users to gain root privileges by using ptrace to attach to a child process that is spawned by the kernel.

CAN-2003-0244: The route cache implementation in Linux 2.4, and the Netfilter IP conntrack module, allows remote attackers to cause a denial of service (CPU consumption) via packets with forged source addresses that cause a large number of hash table collisions related to the PREROUTING chain.

CAN-2003-0246: The ioperm system call in Linux kernel 2.4.20 and earlier does not properly restrict privileges, which allows local users to gain read or write access to certain I/O ports.

CAN-2003-0247: Vulnerability in the TTY layer of the Linux kernel 2.4 allows attackers to cause a denial of service ('kernel oops').

CAN-2003-0248: The mxcsr code in Linux kernel 2.4 allows attackers to modify CPU state registers via a malformed address.

CAN-2003-0364: The TCP/IP fragment reassembly handling in the Linux kernel 2.4 allows remote attackers to cause a denial of service (CPU consumption) via certain packets that cause a large number of hash table collisions.

This advisory covers only the i386 (Intel IA32) architectures. Other architectures will be covered by separate advisories.

Updated kernel packages for Red Hat Enterprise Linux are now available which address several security vulnerabilities.

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

Several security issues have been found that affect the Linux kernel :

Al Viro found a security issue in the tty layer whereby any user could cause a kernel oops. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2003-0247 to this issue.

Andrea Arcangeli found an issue in the low-level mxcsr code in which a malformed address would leave garbage in cpu state registers. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2003-0248 to this issue.

The TCP/IP fragment reassembly handling allows remote attackers to cause a denial of service (CPU consumption) via packets that cause a large number of hash table collisions, a vulnerability similar to CVE-2003-0244. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2003-0364 to this issue.

These kernels also contain updated fixes for the ioperm security issue, as well as fixes for a number of bugs.

It is recommended that users upgrade to these erratum kernels, which contain patches to correct these vulnerabilities.

Updated kernel packages for Red Hat Enterprise Linux are now available
which address several security vulnerabilities.

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

Several security issues have been found that affect the Linux kernel :

Al Viro found a security issue in the tty layer whereby any user could
cause a kernel oops. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CVE-2003-0247 to this issue.

Andrea Arcangeli found an issue in the low-level mxcsr code in which a
malformed address would leave garbage in cpu state registers. The
Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CVE-2003-0248 to this issue.

The TCP/IP fragment reassembly handling allows remote attackers to
cause a denial of service (CPU consumption) via packets that cause a
large number of hash table collisions, a vulnerability similar to
CVE-2003-0244. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CVE-2003-0364 to this issue.

These kernels also contain updated fixes for the ioperm security
issue, as well as fixes for a number of bugs.

It is recommended that users upgrade to these erratum kernels, which
contain patches to correct these vulnerabilities.

ID	Name	Product	Family	Severity
15279	Debian DSA-442-1 : linux-kernel-2.4.17-s390 - several vulnerabilities	Nessus	Debian Local Security Checks	critical
15173	Debian DSA-336-1 : linux-kernel-2.2.20 - several vulnerabilities	Nessus	Debian Local Security Checks	critical
15169	Debian DSA-332-1 : linux-kernel-2.4.17 - several vulnerabilities	Nessus	Debian Local Security Checks	critical
15149	Debian DSA-312-1 : kernel-patch-2.4.18-powerpc - several vulnerabilities	Nessus	Debian Local Security Checks	critical
15148	Debian DSA-311-1 : linux-kernel-2.4.18 - several vulnerabilities	Nessus	Debian Local Security Checks	critical
12401	RHEL 2.1 : kernel (RHSA-2003:195)	Nessus	Red Hat Local Security Checks	critical
801580	Red Hat 2003-195 Security Check	Log Correlation Engine	Generic	high

Detections

Analytics

CVE-2003-0364

high

Tenable Plugins

critical

critical

critical

critical

critical

critical

high