CVE-2019-12098 — In the client side of Heimdal before 7

In the client side of Heimdal before 7.6.0, failure to verify anonymous PKINIT PA-PKINIT-KX key exchange permits a man-in-the-middle attack. This issue is in krb5_init_creds_step in lib/krb5/init_creds_pw.c.

01What is this vulnerability?

In the client side of Heimdal before 7.6.0, failure to verify anonymous PKINIT PA-PKINIT-KX key exchange permits a man-in-the-middle attack. This issue is in krb5_init_creds_step in lib/krb5/init_creds_pw.c.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-05-15T22:41:11.000Z
• Last modified: 2024-08-04T23:10:30.560Z

09References

• github.com — https://github.com/heimdal/heimdal/releases/tag/heimdal-7.6.0
• www.h5l.org — http://www.h5l.org/pipermail/heimdal-announce/2019-May/000009.html
• github.com — https://github.com/heimdal/heimdal/commit/2f7f3d9960aa6ea21358bdf3687cee5149aa35…
• github.com — https://github.com/heimdal/heimdal/compare/3e58559...bbafe72
• seclists.org — https://seclists.org/bugtraq/2019/Jun/1
• www.debian.org — https://www.debian.org/security/2019/dsa-4455
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00002.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00003.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00026.html
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…