CVE-2008-1147

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2008-03-04 · updated 2026-06-16

Description

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.

Affected products

Cosmicperl Directory Pro: 10.0.3
Darwin: 1.0, 9.1
Navision Financials Server: 3.0

References

http://seclists.org/bugtraq/2008/Feb/0052.html
http://seclists.org/bugtraq/2008/Feb/0063.html
http://secunia.com/advisories/28819
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/ip_id.c?rev=1.10%3Bcontenttype=
http://www.securiteam.com/securityreviews/5PP0H0UNGW.html
http://www.securityfocus.com/archive/1/487658
http://www.securityfocus.com/bid/27647
http://www.trusteer.com/docs/OpenBSD_DNS_Cache_Poisoning_and_Multiple_OS_Predictable_IP_ID_Vulnerability.pdf
https://exchange.xforce.ibmcloud.com/vulnerabilities/40329
https://exchange.xforce.ibmcloud.com/vulnerabilities/41155
http://seclists.org/bugtraq/2008/Feb/0052.html
http://seclists.org/bugtraq/2008/Feb/0063.html

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