#VU44030 Input validation error in Linux kernel - CVE-2011-3188

Vulnerability identifier: #VU44030

Vulnerability risk: High

CVSSv4.0: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2011-3188

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

The (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to generate sequence numbers and Fragment Identification values, which makes it easier for remote attackers to cause a denial of service (disrupted networking) or hijack network sessions by predicting these values and sending crafted packets.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 3.0 - 3.0.101

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External links
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6e5714eaf77d79ae1c8b47e3e040ff5411b717ec
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=bc0b96b54a21246e377122d54569eef71cec535f
https://marc.info/?l=bugtraq&m=139447903326211&w=2
https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
https://www.openwall.com/lists/oss-security/2011/08/23/2
https://bugzilla.redhat.com/show_bug.cgi?id=732658
https://github.com/torvalds/linux/commit/6e5714eaf77d79ae1c8b47e3e040ff5411b717ec
https://github.com/torvalds/linux/commit/bc0b96b54a21246e377122d54569eef71cec535f
https://support.f5.com/csp/article/K15301?utm_source=f5support&utm_medium=RSS

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.