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48 lines
1.7 KiB
48 lines
1.7 KiB
From d9e00fa1a7c0f30529d71d818a4e1518f1537053 Mon Sep 17 00:00:00 2001
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From: Kevin McCarthy <kevin@8t8.us>
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Date: Mon, 4 Sep 2023 12:50:07 +0800
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Subject: [PATCH] (CVE-2023-4875) Check for NULL userhdrs.
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When composing an email, miscellaneous extra headers are stored in a
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userhdrs list. Mutt first checks to ensure each header contains at
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least a colon character, passes the entire userhdr field (name, colon,
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and body) to the rfc2047 decoder, and safe_strdup()'s the result on
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the userhdrs list. An empty result would from the decode would result
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in a NULL headers being added to list.
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The previous commit removed the possibility of the decoded header
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field being empty, but it's prudent to add a check to the strchr
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calls, in case there is another unexpected bug resulting in one.
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Thanks to Chenyuan Mi (@morningbread) for discovering the two strchr
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crashes, giving a working example draft message, and providing the
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stack traces for the two NULL derefences.
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(cherry picked from commit 4cc3128abdf52c615911589394a03271fddeefc6)
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---
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sendlib.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/sendlib.c b/sendlib.c
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index 7d2feb62..ed4d7a25 100644
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--- a/sendlib.c
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+++ b/sendlib.c
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@@ -2409,7 +2409,7 @@ int mutt_write_rfc822_header (FILE *fp, ENVELOPE *env, BODY *attach, char *date,
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/* Add any user defined headers */
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for (; tmp; tmp = tmp->next)
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{
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- if ((p = strchr (tmp->data, ':')))
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+ if ((p = strchr (NONULL (tmp->data), ':')))
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{
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q = p;
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@@ -2457,7 +2457,7 @@ static void encode_headers (LIST *h)
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for (; h; h = h->next)
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{
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- if (!(p = strchr (h->data, ':')))
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+ if (!(p = strchr (NONULL (h->data), ':')))
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continue;
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i = p - h->data;
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