blob: 0eb42089905620453689970568f3c54f6fa0b0ef (
plain)
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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200407-12">
<title>Linux Kernel: Remote DoS vulnerability with IPTables TCP Handling</title>
<synopsis>
A flaw has been discovered in 2.6 series Linux kernels that allows an
attacker to send a malformed TCP packet, causing the affected kernel to
possibly enter an infinite loop and hang the vulnerable machine.
</synopsis>
<product type="ebuild">Kernel</product>
<announced>2004-07-14</announced>
<revised count="02">2004-10-10</revised>
<bug>55694</bug>
<access>remote</access>
<affected>
<package name="sys-kernel/aa-sources" auto="no" arch="*">
<unaffected range="ge">2.6.5-r5</unaffected>
<unaffected range="lt">2.6</unaffected>
<vulnerable range="lt">2.6.5-r5</vulnerable>
</package>
<package name="sys-kernel/ck-sources" auto="no" arch="*">
<unaffected range="ge">2.6.7-r2</unaffected>
<unaffected range="lt">2.6</unaffected>
<vulnerable range="lt">2.6.7-r2</vulnerable>
</package>
<package name="sys-kernel/development-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.8</unaffected>
<vulnerable range="lt">2.6.8</vulnerable>
</package>
<package name="sys-kernel/gentoo-dev-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.7-r7</unaffected>
<vulnerable range="lt">2.6.7-r7</vulnerable>
</package>
<package name="sys-kernel/hardened-dev-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.7-r1</unaffected>
<vulnerable range="lt">2.6.7-r1</vulnerable>
</package>
<package name="sys-kernel/hppa-dev-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.7_p1-r1</unaffected>
<vulnerable range="lt">2.6.7_p1-r1</vulnerable>
</package>
<package name="sys-kernel/mips-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.4-r4</unaffected>
<unaffected range="lt">2.6</unaffected>
<vulnerable range="lt">2.6.4-r4</vulnerable>
</package>
<package name="sys-kernel/mm-sources" auto="no" arch="*">
<unaffected range="ge">2.6.7-r4</unaffected>
<unaffected range="lt">2.6</unaffected>
<vulnerable range="lt">2.6.7-r4</vulnerable>
</package>
<package name="sys-kernel/pegasos-dev-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.7-r1</unaffected>
<vulnerable range="lt">2.6.7-r1</vulnerable>
</package>
<package name="sys-kernel/rsbac-dev-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.7-r1</unaffected>
<vulnerable range="lt">2.6.7-r1</vulnerable>
</package>
<package name="sys-kernel/uclinux-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.7_p0-r1</unaffected>
<unaffected range="lt">2.6</unaffected>
<vulnerable range="lt">2.6.7_p0</vulnerable>
</package>
<package name="sys-kernel/usermode-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.6-r2</unaffected>
<unaffected range="lt">2.6</unaffected>
<vulnerable range="lt">2.6.6-r2</vulnerable>
</package>
<package name="sys-kernel/win4lin-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.7-r1</unaffected>
<unaffected range="lt">2.6</unaffected>
<vulnerable range="lt">2.6.7-r1</vulnerable>
</package>
<package name="sys-kernel/xbox-sources" auto="yes" arch="*">
<unaffected range="ge">2.6.7-r1</unaffected>
<unaffected range="lt">2.6</unaffected>
<vulnerable range="lt">2.6.7-r1</vulnerable>
</package>
</affected>
<background>
<p>
The Linux kernel is responsible for managing the core aspects of a
GNU/Linux system, providing an interface for core system applications as
well as providing the essential structure and capability to access hardware
that is needed for a running system.
</p>
</background>
<description>
<p>
An attacker can utilize an erroneous data type in the IPTables TCP option
handling code, which lies in an iterator. By making a TCP packet with a
header length larger than 127 bytes, a negative integer would be implied in
the iterator.
</p>
</description>
<impact type="high">
<p>
By sending one malformed packet, the kernel could get stuck in a loop,
consuming all of the CPU resources and rendering the machine useless,
causing a Denial of Service. This vulnerability requires no local access.
</p>
</impact>
<workaround>
<p>
If users do not use the netfilter functionality or do not use any
``--tcp-option'' rules they are not vulnerable to this exploit. Users that
are may remove netfilter support from their kernel or may remove any
``--tcp-option'' rules they might be using. However, all users are urged to
upgrade their kernels to patched versions.
</p>
</workaround>
<resolution>
<p>
Users are encouraged to upgrade to the latest available sources for their
system:
</p>
<code>
# emerge sync
# emerge -pv your-favorite-sources
# emerge your-favorite-sources
# # Follow usual procedure for compiling and installing a kernel.
# # If you use genkernel, run genkernel as you would do normally.</code>
</resolution>
<references>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0626">CAN-2004-0626</uri>
</references>
<metadata tag="submitter">
plasmaroo
</metadata>
</glsa>
|
