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Linux Kernel Multiple Vulnerabilities
Secunia Advisory: SA16494
Release Date: 2005-08-25
Last Update: 2006-10-17
Popularity: 12,678 views

Critical:
Less critical
Impact: Security Bypass
Exposure of sensitive information
DoS
Where: From remote
Solution Status: Vendor Patch

OS:Linux Kernel 2.4.x
Linux Kernel 2.6.x

Secunia CVSS-2 Score: Available in Secunia business solutions

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Advisory Content (Page 1 of 3)[ 1 ] [ 2 ] [ 3 ]

Description:
Some vulnerabilities have been reported in the Linux kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service), disclose potentially sensitive information, and bypass certain security restrictions, or by malicious people to cause a DoS.

1) The "setsockopt()" function is not restricted to privileged users with the "CAP_NET_ADMIN" capability. This can be exploited to bypass IPsec policies or set invalid policies to exploit other vulnerabilities or exhaust available kernel memory.

2) An error in the "syscall32_setup_pages()" function on 64-bit x86 platforms can be exploited to cause a memory leak by executing a malicious 32-bit application with specially crafted ELF headers.

3) An error in seq_file implementation in the SCSI procfs interface (sg.c), can be exploited to cause a memory leak by repeatedly reading from the /proc/scsi/sg/devices file.

4) An error in validating the first argument of the "sys_set_mempolicy()" function in "mm/mempolicy.c" may be exploited to cause a DoS via a negative argument value.

5) An error in declaring the "portptr" variable that points to the port number in the conntrack tuple as static in "ip_nat_proto_tcp.c" and "ip_nat_proto_udp.c" may be exploited by malicious people to cause memory corruption by causing two packets belonging to the same protocol to be NATed at the same time.

6) A race condition in connection timer handling on SMP multiprocessor systems can be exploited to crash the kernel by setting up an expiration handler to modify the "ip_vs_conn_tab" connection list while the list still being traversed.

7) The "sys_get_thread_area()" function does not properly clear its returned structure. This can potentially expose a small amount of kernel memory to userspace programs.

8) The "icmp_push_reply function()" function does not properly free memory when the "ip_append_data()" function fails. This can be exploited by malicious people to exhaust memory via a large number of specially crafted packets that cause the function to fail.

9) A memory leak in the "ip6_input_finish()" function in "/net/ipv6/ip6_input.c" may be exploit to cause a DoS via certain malformed IPv6 packets that prevents the SKB from being freed.

10) An error during error recovery in the "__block_prepare_write()" function in fs/buffer.c may disclose contents of previously deleted files.

The vulnerabilities have been reported in the 2.6 kernel. Vulnerability #6 also affects the 2.4 kernel.

Change Page:
[ 1 ] [ 2 ] [ 3 ]



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