The kexec-tools package contains the /sbin/kexec binary and utilities that together form the user-space component of the kernel's kexec feature. The /sbin/kexec binary facilitates a new kernel to boot using the kernel's kexec feature either on a normal or a panic reboot. The kexec fastboot mechanism allows booting a Linux kernel from the context of an already running kernel.

Kdump used the SSH (Secure Shell) 'StrictHostKeyChecking=no' option when dumping to SSH targets, causing the target kdump server's SSH host key not to be checked. This could make it easier for a man-in-the-middle attacker on the local network to impersonate the kdump SSH target server and possibly gain access to sensitive information in the vmcore dumps. (CVE-2011-3588)

The mkdumprd utility created initrd files with world-readable permissions. A local user could possibly use this flaw to gain access to sensitive information, such as the private SSH key used to authenticate to a remote server when kdump was configured to dump to an SSH target. (CVE-2011-3589)

The mkdumprd utility included unneeded sensitive files (such as all files from the '/root/.ssh/' directory and the host's private SSH keys) in the resulting initrd. This could lead to an information leak when initrd files were previously created with world-readable permissions. Note: With this update, only the SSH client configuration, known hosts files, and the SSH key configured via the newly introduced sshkey option in '/etc/kdump.conf' are included in the initrd. The default is the key generated when running the 'service kdump propagate' command, '/root/.ssh/kdump_id_rsa'. (CVE-2011-3590)

This updated kexec-tools package also includes numerous bug fixes and enhancements.

All users of kexec-tools are advised to upgrade to this updated package, which resolves these security issues, fixes these bugs and adds these enhancements.

Kexec allows for booting a Linux kernel from the context of an already running kernel.

Kdump used the SSH (Secure Shell) 'StrictHostKeyChecking=no' option when dumping to SSH targets, causing the target kdump server's SSH host key not to be checked. This could make it easier for a man-in-the-middle attacker on the local network to impersonate the kdump SSH target server and possibly gain access to sensitive information in the vmcore dumps. (CVE-2011-3588)

mkdumprd created initrd files with world-readable permissions. A local user could possibly use this flaw to gain access to sensitive information, such as the private SSH key used to authenticate to a remote server when kdump was configured to dump to an SSH target.
(CVE-2011-3589)

mkdumprd included unneeded sensitive files (such as all files from the '/root/.ssh/' directory and the host's private SSH keys) in the resulting initrd. This could lead to an information leak when initrd files were previously created with world-readable permissions. Note:
With this update, only the SSH client configuration, known hosts files, and the SSH key configured via the newly introduced sshkey option in '/etc/kdump.conf' are included in the initrd. The default is the key generated when running the 'service kdump propagate' command, '/root/.ssh/kdump_id_rsa'. (CVE-2011-3590)

This update also fixes several bugs and adds various enhancements.

All kexec-tools users should upgrade to this updated package, which contains backported patches to resolve these issues and add these enhancements.

From Red Hat Security Advisory 2012:0152 :

An updated kexec-tools package that resolves three security issues, fixes several bugs and adds various enhancements is now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The kexec-tools package contains the /sbin/kexec binary and utilities that together form the user-space component of the kernel's kexec feature. The /sbin/kexec binary facilitates a new kernel to boot using the kernel's kexec feature either on a normal or a panic reboot. The kexec fastboot mechanism allows booting a Linux kernel from the context of an already running kernel.

Kdump used the SSH (Secure Shell) 'StrictHostKeyChecking=no' option when dumping to SSH targets, causing the target kdump server's SSH host key not to be checked. This could make it easier for a man-in-the-middle attacker on the local network to impersonate the kdump SSH target server and possibly gain access to sensitive information in the vmcore dumps. (CVE-2011-3588)

The mkdumprd utility created initrd files with world-readable permissions. A local user could possibly use this flaw to gain access to sensitive information, such as the private SSH key used to authenticate to a remote server when kdump was configured to dump to an SSH target. (CVE-2011-3589)

The mkdumprd utility included unneeded sensitive files (such as all files from the '/root/.ssh/' directory and the host's private SSH keys) in the resulting initrd. This could lead to an information leak when initrd files were previously created with world-readable permissions. Note: With this update, only the SSH client configuration, known hosts files, and the SSH key configured via the newly introduced sshkey option in '/etc/kdump.conf' are included in the initrd. The default is the key generated when running the 'service kdump propagate' command, '/root/.ssh/kdump_id_rsa'. (CVE-2011-3590)

Red Hat would like to thank Kevan Carstensen for reporting these issues.

This updated kexec-tools package also includes numerous bug fixes and enhancements. Space precludes documenting all of these changes in this advisory. Users are directed to the Red Hat Enterprise Linux 5.8 Technical Notes, linked to in the References, for information on the most significant of these changes.

All users of kexec-tools are advised to upgrade to this updated package, which resolves these security issues, fixes these bugs and adds these enhancements.

The remote Oracle Linux 6 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2011-1532 advisory.

  - The SSH configuration in the Red Hat mkdumprd script for kexec-tools, as distributed in the kexec-tools     1.x before 1.102pre-154 and 2.x before 2.0.0-209 packages in Red Hat Enterprise Linux, disables the     StrictHostKeyChecking option, which allows man-in-the-middle attackers to spoof kdump servers, and obtain     sensitive core information, by using an arbitrary SSH key. (CVE-2011-3588)

  - The Red Hat mkdumprd script for kexec-tools, as distributed in the kexec-tools 1.x before 1.102pre-154 and     2.x before 2.0.0-209 packages in Red Hat Enterprise Linux, uses world-readable permissions for vmcore     files, which allows local users to obtain sensitive information by inspecting the file content, as     demonstrated by a search for a root SSH key. (CVE-2011-3589)

  - The Red Hat mkdumprd script for kexec-tools, as distributed in the kexec-tools 1.x before 1.102pre-154 and     2.x before 2.0.0-209 packages in Red Hat Enterprise Linux, includes all of root's SSH private keys within     a vmcore file, which allows context-dependent attackers to obtain sensitive information by inspecting the     file content. (CVE-2011-3590)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 6 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2011:1532 advisory.

  - kexec-tools: Multiple security flaws by management of kdump core files and ramdisk images (CVE-2011-3588,     CVE-2011-3589, CVE-2011-3590)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 5 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2012:0152 advisory.

  - kexec-tools: Multiple security flaws by management of kdump core files and ramdisk images (CVE-2011-3588,     CVE-2011-3589, CVE-2011-3590)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
61265	Scientific Linux Security Update : kexec-tools on SL5.x i386/x86_64 (20120221)	Nessus	Scientific Linux Local Security Checks	8/1/2012	1/14/2021	medium
61189	Scientific Linux Security Update : kexec-tools on SL6.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	8/1/2012	1/14/2021	medium
68470	Oracle Linux 5 : kexec-tools (ELSA-2012-0152)	Nessus	Oracle Linux Local Security Checks	7/12/2013	1/14/2021	medium
181108	Oracle Linux 6 : kexec-tools (ELSA-2011-1532)	Nessus	Oracle Linux Local Security Checks	9/7/2023	9/7/2023	critical
57013	RHEL 6 : kexec-tools (RHSA-2011:1532)	Nessus	Red Hat Local Security Checks	12/6/2011	4/21/2024	medium
58053	RHEL 5 : kexec-tools (RHSA-2012:0152)	Nessus	Red Hat Local Security Checks	2/21/2012	4/27/2024	medium

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