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46 lines
1.6 KiB
Diff
46 lines
1.6 KiB
Diff
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Fix CVE-2017-11103:
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https://orpheus-lyre.info/
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11103
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https://security-tracker.debian.org/tracker/CVE-2017-11103
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Patch lifted from upstream source repository:
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https://github.com/heimdal/heimdal/commit/6dd3eb836bbb80a00ffced4ad57077a1cdf227ea
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From 6dd3eb836bbb80a00ffced4ad57077a1cdf227ea Mon Sep 17 00:00:00 2001
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From: Jeffrey Altman <jaltman@secure-endpoints.com>
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Date: Wed, 12 Apr 2017 15:40:42 -0400
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Subject: [PATCH] CVE-2017-11103: Orpheus' Lyre KDC-REP service name validation
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In _krb5_extract_ticket() the KDC-REP service name must be obtained from
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encrypted version stored in 'enc_part' instead of the unencrypted version
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stored in 'ticket'. Use of the unecrypted version provides an
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opportunity for successful server impersonation and other attacks.
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Identified by Jeffrey Altman, Viktor Duchovni and Nico Williams.
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Change-Id: I45ef61e8a46e0f6588d64b5bd572a24c7432547c
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---
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lib/krb5/ticket.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/lib/krb5/ticket.c b/lib/krb5/ticket.c
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index d95d96d1b..b8d81c6ad 100644
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--- a/lib/krb5/ticket.c
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+++ b/lib/krb5/ticket.c
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@@ -705,8 +705,8 @@ _krb5_extract_ticket(krb5_context context,
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/* check server referral and save principal */
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ret = _krb5_principalname2krb5_principal (context,
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&tmp_principal,
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- rep->kdc_rep.ticket.sname,
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- rep->kdc_rep.ticket.realm);
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+ rep->enc_part.sname,
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+ rep->enc_part.srealm);
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if (ret)
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goto out;
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if((flags & EXTRACT_TICKET_ALLOW_SERVER_MISMATCH) == 0){
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--
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2.13.3
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