[17219] in Kerberos-V5-bugs
[krbdev.mit.edu #9227] git commit
daemon@ATHENA.MIT.EDU (Greg Hudson via RT)
Mon Nov 9 12:01:52 2026
From: "Greg Hudson via RT" <rt@krbdev.mit.edu>
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Date: Mon, 09 Nov 2026 12:00:40 -0500
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<URL: https://krbdev.mit.edu/rt/Ticket/Display.html?id=9227 >
Prevent null dereference in PKINIT CMS processing
In cms_signeddata_verify(), where we use CMS_get0_content(), check
that the dereferenced result is non-null as well as the result itself.
(The result itself is a pointer to the eContent slot, whether or not
the decoded ASN.1 value contained an eContent field, and will only be
null if the CMS_ContentInfo object has an unexpected type.)
CVE-2026-71200:
If a KDC is configured to allow PKINIT authentication, an
unauthenticated attacker can trigger a null pointer dereference,
causing the process to terminate. Discovered by Claude and Ada
Logics, and independently by Erin Liman using DeepSeek.
(cherry picked from commit 6a5d772002c1764bd14934ccb6684f0cce15d617)
https://github.com/krb5/krb5/commit/1b3a8db6567ff840b3cda173c9f0a9802b5fef8e
Author: Greg Hudson <ghudson@mit.edu>
Commit: 1b3a8db6567ff840b3cda173c9f0a9802b5fef8e
Branch: krb5-1.22
src/plugins/preauth/pkinit/pkinit_crypto_openssl.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
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