National Cyber Awareness System

Vulnerability Summary for CVE-2008-1147

Overview

A certain pseudo-random number generator (PRNG) algorithm that uses XOR and 2-bit random hops (aka "Algorithm X2"), as used in OpenBSD 2.6 through 3.4, Mac OS X 10 through 10.5.1, FreeBSD 4.4 through 7.0, and DragonFlyBSD 1.0 through 1.10.1, allows remote attackers to guess sensitive values such as IP fragmentation IDs by observing a sequence of previously generated values. NOTE: this issue can be leveraged for attacks such as injection into TCP packets and OS fingerprinting.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

References to Advisories, Solutions, and Tools

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External Source: MISC

Name: http://www.trusteer.com/docs/OpenBSD_DNS_Cache_Poisoning_and_Multiple_OS_Predictable_IP_ID_Vulnerability.pdf

Hyperlink:http://www.trusteer.com/docs/OpenBSD_DNS_Cache_Poisoning_and_Multiple_OS_Predictable_IP_ID_Vulnerability.pdf

External Source: BID

Name: 27647

Hyperlink:http://www.securityfocus.com/bid/27647

External Source: BUGTRAQ

Name: 20080206 A paper by Amit Klein (Trusteer): "OpenBSD DNS Cache Poisoning and Multiple O/S Predictable IP ID Vulnerability"

Hyperlink:http://www.securityfocus.com/archive/1/487658

External Source: MISC

Name: http://www.securiteam.com/securityreviews/5PP0H0UNGW.html

Hyperlink:http://www.securiteam.com/securityreviews/5PP0H0UNGW.html

External Source: CONFIRM

Name: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/ip_id.c?rev=1.10;contenttype=

Hyperlink:http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/ip_id.c?rev=1.10;contenttype=

External Source: SECUNIA

Name: 28819

Type: Advisory

Hyperlink:http://secunia.com/advisories/28819

External Source: BUGTRAQ

Name: 20080206 RE: A paper by Amit Klein (Trusteer): "OpenBSD DNS Cache Poisoning and Multiple O/S Predictable IP ID Vulnerability"

Hyperlink:http://seclists.org/bugtraq/2008/Feb/0063.html

External Source: BUGTRAQ

Name: 20080206 Re: A paper by Amit Klein (Trusteer): "OpenBSD DNS Cache Poisoning and Multiple O/S Predictable IP ID Vulnerability"

Hyperlink:http://seclists.org/bugtraq/2008/Feb/0052.html

External Source: XF

Name: openbsd-xor-weak-security(41155)

Hyperlink:http://xforce.iss.net/xforce/xfdb/41155

External Source: XF

Name: openbsd-prng-dns-spoofing(40329)

Hyperlink:http://xforce.iss.net/xforce/xfdb/40329