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-   Linux - Security (https://www.linuxquestions.org/questions/linux-security-4/)
-   -   Kernel Vulns (https://www.linuxquestions.org/questions/linux-security-4/kernel-vulns-399624/)

win32sux 08-27-2009 04:37 PM
Linux Kernel ".getname" Information Disclosure
 
Quote:
Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to disclose potentially sensitive information.

The vulnerabilities are caused due to the proto_ops ".getname" functions for various protocols not properly clearing certain structure members before returning them to userspace, which can be exploited to disclose kernel memory.
Secunia Advisory

win32sux 09-11-2009 02:08 AM
Linux Kernel "tc_fill_tclass()" Information Disclosure
 
Quote:
A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious, local users to disclose potentially sensitive information.

The vulnerability is caused due to the "tc_fill_tclass()" function in net/sched/sch_api.c not properly clearing certain structure members before returning them to userspace, which can be exploited to disclose kernel memory.
Secunia Advisory

win32sux 09-15-2009 05:53 AM
Linux Kernel AppleTalk-IP Memory Leak Denial of Service
 
Quote:
A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a memory leak when handling certain AppleTalk-IP datagrams. This can be exploited to cause a DoS due to memory exhaustion by e.g. sending a large amount of specially crafted AppleTalk-IP datagrams.

Successful exploitation requires that the appletalk and ipddp modules are loaded and attached to the same interface.
Secunia Advisory

win32sux 09-17-2009 03:21 PM
Linux Kernel Denial of Service and Privilege Escalation
 
Quote:
Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to gain escalated privileges and by malicious people to cause a DoS (Denial of Service).

1) An error exists within the "find_ie()" function in net/wireless/scan.c, which can be exploited to trigger an infinite loop by sending specially crafted packets.

Note: This does not affect versions prior to 2.6.30.

2) A boundary error within the "perf_copy_attr()" function in kernel/perf_counter.c can be exploited to cause a buffer overflow by e.g. passing specially crafted data via the "perf_counter_open()" syscall.

Note: This does not affect versions prior to 2.6.31.
Secunia Advisory

win32sux 10-02-2009 05:53 PM
Linux Kernel 64bit Kernel Register Value Leak
 
Quote:
A security issue has been reported in the Linux Kernel, which can be exploited by malicious, local users to disclose certain system information.

The security issue is caused due to the kernel not properly clearing certain 64bit registers before returning to a 32bit process, which can be exploited to disclose the value of the 64bit registers by temporarily switching a 32bit process into 64bit mode.

Successful exploitation requires an x86-64 system.
Secunia Advisory

win32sux 10-19-2009 01:13 PM
Linux Kernel "unix_stream_connect()" Denial of Service Security Issue
 
Quote:
A security issue has been discovered in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service).

The security issue is caused due to a deadlock within the "unix_stream_connect()" function in net/unix/af_unix.c, which can be exploited to cause a DoS by performing certain socket operations.

The security issue is confirmed in version 2.6.31.4. Other versions may also be affected.
Secunia Advisory

win32sux 10-23-2009 06:49 PM
FYI: The previous Secunia Advisory has been updated to include multiple vulnerabilities.

win32sux 10-28-2009 03:13 AM
Linux Kernel connector Security Bypass
 
Quote:
A security issue has been reported in the Linux Kernel, which can be exploited by malicious, local users to bypass certain security restrictions.

The security issue is caused due to unprivileged users being able to send netlink packets to certain subsystems using connector, which can be exploited to e.g. change certain configurations and perform other operations that should not be available to unprivileged users.
Secunia Advisory

win32sux 11-04-2009 09:49 PM
Linux Kernel "fs/pipe.c" Locking Error NULL Pointer Dereference
 
Quote:
A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges.

The vulnerability is caused due to a locking error within the "pipe_rdwr_open()", "pipe_write_open()", and "pipe_read_open()" functions in fs/pipe.c. This can be exploited to cause a NULL pointer deference by performing certain pipe operations.
Secunia Advisory

win32sux 11-09-2009 08:14 PM
Linux 2.6.31.6 has been released.
 
It includes fixes for at least two security vulnerabilities (CVE-2009-3612 and CVE-2009-3621).

The full 2.6.31.6 ChangeLog is here.

win32sux 11-17-2009 12:02 PM
Linux Kernel KVM MCE "KVM_X86_SETUP_MCE" Buffer Overflow
 
Quote:
A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges.

The vulnerability is caused due to an error within the "kvm_vcpu_ioctl_x86_setup_mce()" function in arch/x86/kvm/x86.c. This can be exploited to corrupt kernel memory by e.g. sending a specially crafted "KVM_X86_SETUP_MCE" IOCTL.
Secunia Advisory

win32sux 11-19-2009 11:36 AM
Linux Kernel "gdth_read_event()" Array Indexing Vulnerability
 
Quote:
A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges.

The vulnerability is caused due to an array indexing error within the "gdth_read_event()" function in drivers/scsi/gdth.c, which can be exploited by sending a specially crafted IOCTL to the driver.
Secunia Advisory

win32sux 12-05-2009 01:46 AM
Linux Kernel Multiple Vulnerabilities
 
Quote:
A security issue and some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to manipulate certain data and cause a DoS (Denial of Service), and by malicious people to potentially compromise a vulnerable system.

1) The security issue is caused due to insecure permissions being set to driver attributes in sysfs ("/sys/bus/pci/drivers/megaraid_sas/poll_mode_io") and can be exploited to manipulate driver behaviour.

2) A locking error within the TTY subsystem can be exploited to cause a NULL pointer dereference.

3) A boundary error within the "hfs_bnode_read()" function in fs/hfs/bnode.c can be exploited to cause a buffer overflow by e.g. tricking a user into mounting and accessing a specially crafted HFS file system.
Secunia Advisory

win32sux 12-11-2009 02:33 PM
Linux Kernel Ext4 Multiple Vulnerabilities
 
Quote:
Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) or gain escalated privileges.

1) A vulnerability is caused due to insufficient access checks when processing the "EXT4_IOC_MOVE_EXT" IOCTL, which can be exploited to overwrite files with root privileges by sending a specially crafted IOCTL.

2) An error within the "ext4_fill_flex_info()" function in fs/ext4/super.c can be exploited to cause a division by zero by mounting a specially crafted filesystem.

3) An error within the "ext4_decode_error()" function in fs/ext4/super.c can be exploited to cause a NULL pointer dereference by mounting a specially crafted filesystem.
Secunia Advisory

win32sux 01-13-2010 11:13 PM
Linux Kernel ebtables Security Bypass
 
Quote:
A security issue has been reported in the Linux Kernel, which can be exploited by malicious, local users to bypass certain security restrictions.

The security issue is caused due to the "do_ebt_set_ctl()" and "do_ebt_get_ctl()" functions in net/bridge/netfilter/ebtables.c not properly restricting access to users with the "CAP_NET_ADMIN" capability, which can be exploited to e.g. set and modify ebtables rules without having the proper capability.
Secunia Advisory


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