Accessing, Modifying or Executing Executable Files
An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
Leverage Executable Code in Non-Executable Files
An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.
The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality.
The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
Restful Privilege Elevation
Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side.
The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
Target Programs with Elevated Privileges
This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
Manipulating Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
|NASL family||Ubuntu Local Security Checks |
|NASL id||UBUNTU_USN-1186-1.NASL |
|description||Dan Rosenberg discovered that IPC structures were not correctly initialized on 64bit systems. A local attacker could exploit this to read kernel stack memory, leading to a loss of privacy.
Steve Chen discovered that setsockopt did not correctly check MSS values. A local attacker could make a specially crafted socket call to crash the system, leading to a denial of service. (CVE-2010-4165)
Vladymyr Denysov discovered that Xen virtual CD-ROM devices were not handled correctly. A local attacker in a guest could make crafted blkback requests that would crash the host, leading to a denial of service. (CVE-2010-4238)
Vegard Nossum discovered that memory garbage collection was not handled correctly for active sockets. A local attacker could exploit this to allocate all available kernel memory, leading to a denial of service. (CVE-2010-4249)
Dan Carpenter discovered that the Infiniband driver did not correctly handle certain requests. A local user could exploit this to crash the system or potentially gain root privileges. (CVE-2010-4649, CVE-2011-1044)
Dan Rosenberg discovered that XFS did not correctly initialize memory.
A local attacker could make crafted ioctl calls to leak portions of kernel stack memory, leading to a loss of privacy. (CVE-2011-0711)
Timo Warns discovered that MAC partition parsing routines did not correctly calculate block counts. A local attacker with physical access could plug in a specially crafted block device to crash the system or potentially gain root privileges. (CVE-2011-1010)
Neil Horman discovered that NFSv4 did not correctly handle certain orders of operation with ACL data. A remote attacker with access to an NFSv4 mount could exploit this to crash the system, leading to a denial of service. (CVE-2011-1090)
Vasiliy Kulikov discovered that the netfilter code did not check certain strings copied from userspace. A local attacker with netfilter access could exploit this to read kernel memory or crash the system, leading to a denial of service. (CVE-2011-1170, CVE-2011-1171, CVE-2011-1172, CVE-2011-2534)
Vasiliy Kulikov discovered that the Acorn Universal Networking driver did not correctly initialize memory. A remote attacker could send specially crafted traffic to read kernel stack memory, leading to a loss of privacy. (CVE-2011-1173)
Vasiliy Kulikov discovered that taskstats listeners were not correctly handled. A local attacker could exploit this to exhaust memory and CPU resources, leading to a denial of service. (CVE-2011-2484).
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. |
|last seen||2019-02-21 |
|plugin id||55784 |
|title||Ubuntu 8.04 LTS : linux vulnerabilities (USN-1186-1) |
|NASL family||Misc. |
|NASL id||VMWARE_VMSA-2011-0012_REMOTE.NASL |
|description||The remote VMware ESX / ESXi host is missing a security-related patch.
It is, therefore, affected by multiple vulnerabilities in several third-party components and libraries :
- mptspi |
|last seen||2019-02-21 |
|plugin id||89680 |
|title||VMware ESX / ESXi Third-Party Libraries Multiple Vulnerabilities (VMSA-2011-0012) (remote check) |
|NASL family||Red Hat Local Security Checks |
|NASL id||REDHAT-RHSA-2011-0017.NASL |
|description||Updated kernel packages that fix multiple security issues, address several hundred bugs, and add numerous enhancements are now available as part of the ongoing support and maintenance of Red Hat Enterprise Linux version 5. This is the sixth regular update.
The Red Hat Security Response Team has rated this update as having important 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 kernel packages contain the Linux kernel, the core of any Linux operating system.
This update fixes the following security issues :
* A NULL pointer dereference flaw was found in the igb driver in the Linux kernel. If both the Single Root I/O Virtualization (SR-IOV) feature and promiscuous mode were enabled on an interface using igb, it could result in a denial of service when a tagged VLAN packet is received on that interface. (CVE-2010-4263, Important)
* A missing sanity check was found in vbd_create() in the Xen hypervisor implementation. As CD-ROM drives are not supported by the blkback back-end driver, attempting to use a virtual CD-ROM drive with blkback could trigger a denial of service (crash) on the host system running the Xen hypervisor. (CVE-2010-4238, Moderate)
* A flaw was found in the Linux kernel execve() system call implementation. A local, unprivileged user could cause large amounts of memory to be allocated but not visible to the OOM (Out of Memory) killer, triggering a denial of service. (CVE-2010-4243, Moderate)
* A flaw was found in fixup_page_fault() in the Xen hypervisor implementation. If a 64-bit para-virtualized guest accessed a certain area of memory, it could cause a denial of service on the host system running the Xen hypervisor. (CVE-2010-4255, Moderate)
* A missing initialization flaw was found in the bfa driver used by Brocade Fibre Channel Host Bus Adapters. A local, unprivileged user could use this flaw to cause a denial of service by reading a file in the '/sys/class/fc_host/host#/statistics/' directory. (CVE-2010-4343, Moderate)
* Missing initialization flaws in the Linux kernel could lead to information leaks. (CVE-2010-3296, CVE-2010-3877, CVE-2010-4072, CVE-2010-4073, CVE-2010-4075, CVE-2010-4080, CVE-2010-4081, CVE-2010-4158, Low)
Red Hat would like to thank Kosuke Tatsukawa for reporting CVE-2010-4263; Vladymyr Denysov for reporting CVE-2010-4238; Brad Spengler for reporting CVE-2010-4243; Dan Rosenberg for reporting CVE-2010-3296, CVE-2010-4073, CVE-2010-4075, CVE-2010-4080, CVE-2010-4081, and CVE-2010-4158; Vasiliy Kulikov for reporting CVE-2010-3877; and Kees Cook for reporting CVE-2010-4072.
These updated packages also include several hundred bug fixes for and enhancements to the Linux kernel. Space precludes documenting each of these changes in this advisory and users are directed to the Red Hat Enterprise Linux 5.6 Release Notes for information on the most significant of these changes :
Refer to the kernel chapter in the Red Hat Enterprise Linux 5.6 Technical Notes for further information :
All Red Hat Enterprise Linux 5 users are advised to install these updated packages, which address these vulnerabilities as well as fixing the bugs and adding the enhancements noted in the Red Hat Enterprise Linux 5.6 Release Notes and Technical Notes. The system must be rebooted for this update to take effect. |
|last seen||2019-02-21 |
|plugin id||51522 |
|title||RHEL 5 : kernel (RHSA-2011:0017) |
|NASL family||VMware ESX Local Security Checks |
|NASL id||VMWARE_VMSA-2011-0012.NASL |
|description||a. ESX third-party update for Service Console kernel
This update takes the console OS kernel package to kernel-2.6.18-238.9.1 which resolves multiple security issues.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the names CVE-2010-1083, CVE-2010-2492, CVE-2010-2798, CVE-2010-2938, CVE-2010-2942, CVE-2010-2943, CVE-2010-3015, CVE-2010-3066, CVE-2010-3067, CVE-2010-3078, CVE-2010-3086, CVE-2010-3296, CVE-2010-3432, CVE-2010-3442, CVE-2010-3477, CVE-2010-3699, CVE-2010-3858, CVE-2010-3859, CVE-2010-3865, CVE-2010-3876, CVE-2010-3877, CVE-2010-3880, CVE-2010-3904, CVE-2010-4072, CVE-2010-4073, CVE-2010-4075, CVE-2010-4080, CVE-2010-4081, CVE-2010-4083, CVE-2010-4157, CVE-2010-4158, CVE-2010-4161, CVE-2010-4238, CVE-2010-4242, CVE-2010-4243, CVE-2010-4247, CVE-2010-4248, CVE-2010-4249, CVE-2010-4251, CVE-2010-4255, CVE-2010-4263, CVE-2010-4343, CVE-2010-4346, CVE-2010-4526, CVE-2010-4655, CVE-2011-0521, CVE-2011-0710, CVE-2011-1010, CVE-2011-1090 and CVE-2011-1478 to these issues.
b. ESX third-party update for Service Console krb5 RPMs
This patch updates the krb5-libs and krb5-workstation RPMs of the console OS to version 1.6.1-55.el5_6.1, which resolves multiple security issues.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the names CVE-2010-1323, CVE-2011-0281, and CVE-2011-0282 to these issues.
c. ESXi and ESX update to third-party component glibc
The glibc third-party library is updated to resolve multiple security issues.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the names CVE-2010-0296, CVE-2011-0536, CVE-2011-1071, CVE-2011-1095, CVE-2011-1658, and CVE-2011-1659 to these issues.
d. ESX update to third-party drivers mptsas, mpt2sas, and mptspi
The mptsas, mpt2sas, and mptspi drivers are updated which addresses multiple security issues in the mpt2sas driver.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the names CVE-2011-1494 and CVE-2011-1495 to these issues. |
|last seen||2019-02-21 |
|plugin id||56508 |
|title||VMSA-2011-0012 : VMware ESXi and ESX updates to third-party libraries and ESX Service Console |