Multiple unknown vulnerabilities in Linux kernel 2.4 and 2.6 allow local users to gain privileges or access kernel memory, as found by the Sparse source code checking tool.

The remote host is affected by the vulnerability described in GLSA-200407-02 (Linux Kernel: Multiple vulnerabilities)

    Multiple flaws have been discovered in the Linux kernel. This advisory     corrects the following issues:
    CAN-2004-0109: This vulnerability allows privilege escalation using     ISO9660 file systems through a buffer overflow via a malformed file     system containing a long symbolic link entry. This can allow arbitrary     code execution at kernel level.
    CAN-2004-0133: The XFS file system in 2.4 series kernels has an     information leak by which data in the memory can be written to the     device hosting the file system, allowing users to obtain portions of     kernel memory by reading the raw block device.
    CAN-2004-0177: The ext3 file system in 2.4 series kernels does not     properly initialize journal descriptor blocks, causing an information     leak by which data in the memory can be written to the device hosting     the file system, allowing users to obtain portions of kernel memory by     reading the raw device.
    CAN-2004-0181: The JFS file system in 2.4 series kernels has an     information leak by which data in the memory can be written to the     device hosting the file system, allowing users to obtain portions of     kernel memory by reading the raw device.
    CAN-2004-0178: The OSS Sound Blaster [R] Driver has a Denial of Service     vulnerability since it does not handle certain sample sizes properly.
    This allows local users to hang the kernel.
    CAN-2004-0228: Due to an integer signedness error in the CPUFreq /proc     handler code in 2.6 series Linux kernels, local users can escalate     their privileges.
    CAN-2004-0229: The framebuffer driver in 2.6 series kernel drivers does     not use the fb_copy_cmap method of copying structures. The impact of     this issue is unknown, however.
    CAN-2004-0394: A buffer overflow in the panic() function of 2.4 series     Linux kernels exists, but it may not be exploitable under normal     circumstances due to its functionality.
    CAN-2004-0427: The do_fork() function in both 2.4 and 2.6 series Linux     kernels does not properly decrement the mm_count counter when an error     occurs, triggering a memory leak that allows local users to cause a     Denial of Service by exhausting other applications of memory; causing     the kernel to panic or to kill services.
    CAN-2004-0495: Multiple vulnerabilities found by the Sparse source     checker in the kernel allow local users to escalate their privileges or     gain access to kernel memory.
    CAN-2004-0535: The e1000 NIC driver does not properly initialize memory     structures before using them, allowing users to read kernel memory.
    CAN-2004-0554: 2.4 and 2.6 series kernels running on an x86 or an AMD64     architecture allow local users to cause a Denial of Service by a total     system hang, due to an infinite loop that triggers a signal handler     with a certain sequence of fsave and frstor instructions.
    Local DoS in PaX: If ASLR is enabled as a GRSecurity PaX feature, a     Denial of Service can be achieved by putting the kernel into an     infinite loop. Only 2.6 series GRSecurity kernels are affected by this     issue.
    RSBAC 1.2.3 JAIL issues: A flaw in the RSBAC JAIL implementation allows     suid/sgid files to be created inside the jail since the relevant module     does not check the corresponding mode values. This can allow privilege     escalation inside the jail. Only rsbac-(dev-)sources are affected by     this issue.
  Impact :

    Arbitrary code with normal non-super-user privileges may be able to     exploit any of these vulnerabilities; gaining kernel level access to     memory structures and hardware devices. This may be used for further     exploitation of the system, to leak sensitive data or to cause a Denial     of Service on the affected kernel.
  Workaround :

    Although users may not be affected by certain vulnerabilities, all     kernels are affected by the CAN-2004-0394, CAN-2004-0427 and     CAN-2004-0554 issues which have no workaround. As a result, all users     are urged to upgrade their kernels to patched versions.

A number of vulnerabilities were discovered in the Linux kernel that are corrected with this update :

Multiple vulnerabilities were found by the Sparse source checker that could allow local users to elevate privileges or gain access to kernel memory (CVE-2004-0495).

Missing Discretionary Access Controls (DAC) checks in the chown(2) system call could allow an attacker with a local account to change the group ownership of arbitrary files, which could lead to root privileges on affected systems (CVE-2004-0497).

An information leak vulnerability that affects only ia64 systems was fixed (CVE-2004-0565).

Insecure permissions on /proc/scsi/qla2300/HbaApiNode could allow a local user to cause a DoS on the system; this only affects Mandrakelinux 9.2 and below (CVE-2004-0587).

A vulnerability that could crash the kernel has also been fixed. This crash, however, can only be exploited via root (in br_if.c).

The provided packages are patched to fix these vulnerabilities. All users are encouraged to upgrade to these updated kernels.

To update your kernel, please follow the directions located at :

http://www.mandrakesoft.com/security/kernelupdate

The remote host is missing the patch for the advisory SUSE-SA:2004:020 (kernel).


Multiple security vulnerabilities are being addressed with this security update of the Linux kernel.

Kernel memory access vulnerabilities are fixed in the e1000, decnet, acpi_asus, alsa, airo/WLAN, pss and mpu401 drivers. These vulnerabilities can lead to kernel memory read access, write access and local denial of service conditions, resulting in access to the root account for an attacker with a local account on the affected system.

Missing Discretionary Access Control (DAC) checks in the chown(2) system call allow an attacker with a local account to change the group ownership of arbitrary files, which leads to root privileges on affected systems. It is specific to kernel version 2.6 based systems such as the SUSE Linux 9.1 product, that only local shell access is needed to exploit this vulnerability. An interesting variant of the missing checks is that the ownership of files in the /proc filesystem can be altered, while the changed ownership still does not allow the files to be accessed as a non-root user for to be able to exploit the vulnerability. Systems that are based on a version 2.4 kernel are not vulnerable to the /proc weakness, and exploitation of the weakness requires the use of the kernel NFS server (knfsd). If the knfsd NFS server is not activated (it is off by default), the vulnerability is not exposed. These issues related to the chown(2) system call have been discovered by Michael Schroeder and Ruediger Oertel, both SUSE LINUX.

The only network-related vulnerability fixed with the kernel updates that are subject to this announcement affect the SUSE Linux 9.1 distribution only, as it is based on a 2.6 kernel. Found and reported to bugtraq by Adam Osuchowski and Tomasz Dubinski, the vulnerability allows a remote attacker to send a specially crafted TCP packet to a vulnerable system, causing that system to stall if it makes use of TCP option matching netfilter rules.

In some rare configurations of the SUSE Linux 9.1 distribution, some users have experienced stalling systems during system startup. These problems are fixed with this kernel update.

Numerous problems referencing userspace memory were identified in several device drivers by Al Viro using the sparse tool. The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned the name CVE-2004-0495 to this issue.

A problem was found where userspace code could execute certain floating point instructions from signal handlers which would cause the kernel to lock up. The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned the name CVE-2004-0554 to this issue.

Previous kernels contained a patch against the framebuffer ioctl code which turned out to be unnecessary. This has been dropped in this update.

A memory leak in the E1000 network card driver has been fixed. The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned the name CVE-2004-0535 to this issue.

Previously, inappropriate permissions were set on /proc/scsi/qla2300/HbaApiNode The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned the name CVE-2004-0587 to this issue.

Support for systems with more than 4GB of memory was previously unavailable. The 686 SMP kernel now supports this configuration.
(Bugzilla #122960) Support for SMP on 586's was also previously not included. This has also been rectified. (Bugzilla #111871)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Updated kernel packages for Red Hat Enterprise Linux 2.1 that fix security vulnerabilities are now available.

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

A flaw was found in Linux kernel versions 2.4 and 2.6 for x86 and x86_64 that allowed local users to cause a denial of service (system crash) by triggering a signal handler with a certain sequence of fsave and frstor instructions. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0554 to this issue.

Enhancements were committed to the 2.6 kernel by Al Viro which enabled the Sparse source code checking tool to check for a certain class of kernel bugs. A subset of these fixes also applies to various drivers in the 2.4 kernel. These flaws could lead to privilege escalation or access to kernel memory. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0495 to these issues.

All Red Hat Enterprise Linux 2.1 users are advised to upgrade their kernels to the packages associated with their machine architectures and configurations as listed in this erratum. These packages contain backported patches to correct these issues.

Updated kernel packages for Red Hat Enterprise Linux 3 that fix security vulnerabilities are now available.

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

A flaw was found in Linux kernel versions 2.4 and 2.6 for x86 and x86_64 that allowed local users to cause a denial of service (system crash) by triggering a signal handler with a certain sequence of fsave and frstor instructions. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0554 to this issue.

Another flaw was discovered in an error path supporting the clone() system call that allowed local users to cause a denial of service (memory leak) by passing invalid arguments to clone() running in an infinite loop of a user's program. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0427 to this issue.

Enhancements were committed to the 2.6 kernel by Al Viro which enabled the Sparse source code checking tool to check for a certain class of kernel bugs. A subset of these fixes also applies to various drivers in the 2.4 kernel. Although the majority of these resides in drivers unsupported in Red Hat Enterprise Linux 3, the flaws could lead to privilege escalation or access to kernel memory. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0495 to these issues.

All Red Hat Enterprise Linux 3 users are advised to upgrade their kernels to the packages associated with their machine architectures and configurations as listed in this erratum. These packages contain backported patches to correct these issues.

Updated kernel packages for Red Hat Enterprise Linux 3 that fix
security vulnerabilities are now available.

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

A flaw was found in Linux kernel versions 2.4 and 2.6 for x86 and
x86_64 that allowed local users to cause a denial of service (system
crash) by triggering a signal handler with a certain sequence of fsave
and frstor instructions. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CVE-2004-0554 to this
issue.

Another flaw was discovered in an error path supporting the clone()
system call that allowed local users to cause a denial of service
(memory leak) by passing invalid arguments to clone() running in an
infinite loop of a user's program. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CVE-2004-0427
to this issue.

Enhancements were committed to the 2.6 kernel by Al Viro which enabled
the Sparse source code checking tool to check for a certain class of
kernel bugs. A subset of these fixes also applies to various drivers
in the 2.4 kernel. Although the majority of these resides in drivers
unsupported in Red Hat Enterprise Linux 3, the flaws could lead to
privilege escalation or access to kernel memory. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the
name CVE-2004-0495 to these issues.

All Red Hat Enterprise Linux 3 users are advised to upgrade their
kernels to the packages associated with their machine architectures
and configurations as listed in this erratum. These packages contain
backported patches to correct these issues.

Numerous problems referencing userspace memory were identified in
several device drivers by Al Viro using the sparse tool. The Common
Vulnerabilities and Exposures project (cve.mitre.org) assigned the
name CVE-2004-0495 to this issue.

A problem was found where userspace code could execute certain
floating point instructions from signal handlers which would cause the
kernel to lock up. The Common Vulnerabilities and Exposures project
(cve.mitre.org) assigned the name CVE-2004-0554 to this issue.

Previous kernels contained a patch against the framebuffer ioctl code
which turned out to be unnecessary. This has been dropped in this
update.

A memory leak in the E1000 network card driver has been fixed. The
Common Vulnerabilities and Exposures project (cve.mitre.org) assigned
the name CVE-2004-0535 to this issue.

Previously, inappropriate permissions were set on
/proc/scsi/qla2300/HbaApiNode The Common Vulnerabilities and Exposures
project (cve.mitre.org) assigned the name CVE-2004-0587 to this issue.

Support for systems with more than 4GB of memory was previously
unavailable. The 686 SMP kernel now supports this configuration.
(Bugzilla #122960) Support for SMP on 586's was also previously not
included. This has also been rectified. (Bugzilla #111871)

ID	Name	Product	Family	Severity
14535	GLSA-200407-02 : Linux Kernel: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
14165	Mandrake Linux Security Advisory : kernel (MDKSA-2004:066)	Nessus	Mandriva Local Security Checks	high
13836	SUSE-SA:2004:020: kernel	Nessus	SuSE Local Security Checks	high
13731	Fedora Core 1 : kernel-2.4.22-1.2194.nptl (2004-186)	Nessus	Fedora Local Security Checks	high
12509	RHEL 2.1 : kernel (RHSA-2004:260)	Nessus	Red Hat Local Security Checks	high
12508	RHEL 3 : kernel (RHSA-2004:255)	Nessus	Red Hat Local Security Checks	high
801594	Red Hat 2004-255 Security Check	Log Correlation Engine	Generic	high
801553	Fedora 2004-186 Security Check	Log Correlation Engine	Generic	high

Detections

Analytics

CVE-2004-0495

high

Tenable Plugins

high

high

high

high

high

high

high

high