1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
Rule:
--
Sid:
100000164
--
Summary:
This event is generated when an ICMP packet crafted to exploit a denial of
service vulnerability in the Linux kernel is detected.
--
Impact:
A denial of service will be caused against vulnerable hosts. If an attacker
sends a continuous stream of such packets, the host can be prevented from
functioning properly for a prolonged period of time.
--
Detailed Information:
Linux kernel versions below 2.6.13 contain a flaw which will result in a null
pointer dereference when processing ICMP packets that contain invalid SCTP
data. In order to be vulnerable, a host must have SCTP enabled.
--
Affected Systems:
Any Linux system with a kernel version < 2.6.13 with SCTP enabled.
--
Attack Scenarios:
An attacker could use a script to send malformed packets to a vulnerable host.
--
Ease of Attack:
Simple, as a publicly available exploit script exists.
--
False Positives:
None known.
--
False Negatives:
None known.
--
Corrective Action:
Upgrade Linux systems' kernel to version 2.6.13 or higher. Alternately, disable
SCTP or use a firewall to block ICMP traffic at your network's border.
--
Contributors:
rmkml
Sourcefire Research Team
--
Additional References
Other:
http://oss.sgi.com/projects/netdev/archive/2005-07/msg00142.html
--
|
