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Date: Fri, 28 Jun 2024 10:56:38 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: Kerberos 1.21.3 fixes vulnerabilities in GSS message token handling
https://mailman.mit.edu/pipermail/kerberos-announce/2024q2/000207.html and
https://web.mit.edu/kerberos/www/krb5-1.21/ have announced the release on
Wed. June 26 of Kerberos 1.21.3 with these changes:
> * Fix vulnerabilities in GSS message token handling [CVE-2024-37370,
> CVE-2024-37371].
>
> * Fix a potential bad pointer free in krb5_cccol_have_contents().
>
> * Fix a memory leak in the macOS ccache type.
https://krbdev.mit.edu/rt/Ticket/Display.html?id=9128 and
https://github.com/krb5/krb5/commit/b0a2f8a5365f2eec3e27d78907de9f9d2c80505a
give this info for the issues assigned CVEs:
> In gss_krb5int_unseal_token_v3() and gss_krb5int_unseal_v3_iov(),
> verify the Extra Count field of CFX wrap tokens against the encrypted
> header. Reported by Jacob Champion.
>
> In gss_krb5int_unseal_token_v3(), check for a decrypted plaintext
> length too short to contain the encrypted header and extra count
> bytes. Reported by Jacob Champion.
>
> In kg_unseal_iov_token(), separately track the header IOV length and
> complete token length when parsing the token's ASN.1 wrapper. This
> fix contains modified versions of functions from k5-der.h and
> util_token.c; this duplication will be cleaned up in a future commit.
>
> CVE-2024-37370:
>
> In MIT krb5 release 1.3 and later, an attacker can modify the
> plaintext Extra Count field of a confidential GSS krb5 wrap token,
> causing the unwrapped token to appear truncated to the application.
>
> CVE-2024-37371:
>
> In MIT krb5 release 1.3 and later, an attacker can cause invalid
> memory reads by sending message tokens with invalid length fields.
--
-Alan Coopersmith- alan.coopersmith@...cle.com
Oracle Solaris Engineering - https://blogs.oracle.com/solaris
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