From: Phil Pennock <phil+git@pennock-tech.com>
Date: Fri, 30 Oct 2020 00:42:40 +0000 (-0400)
Subject: SECURITY: fix Qualys CVE-2020-PFPZA
X-Git-Tag: exim-4.95-RC0~51^2~45
X-Git-Url: https://git.exim.org/exim.git/commitdiff_plain/bafc62583bc4ded96e3a66d2fb98c9d7afaa8768?ds=inline;hp=cb08e2f59f2166660abc998a0554e64c61d4a0f5

SECURITY: fix Qualys CVE-2020-PFPZA

(cherry picked from commit 29d7a8c25f182c91d5d30f124f9e296dce5c018e)
(cherry picked from commit 0a6a7a3fd8464bae9ce0cf889e8eeb0bf0bab756)
---

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 07fba9c23..95b95e794 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -273,6 +273,9 @@ PP/05 Fix security issue CVE-2020-PFPSN and guard against cmdline invoker
       providing a particularly obnoxious sender full name.
       Reported by Qualys.
 
+pp/06 Fix CVE-2020-28016 (PFPZA): Heap out-of-bounds write in parse_fix_phrase()
+
+
 
 Exim version 4.94
 -----------------
diff --git a/src/src/parse.c b/src/src/parse.c
index 7dfb9a7eb..8d689e88a 100644
--- a/src/src/parse.c
+++ b/src/src/parse.c
@@ -984,6 +984,11 @@ if (i < len)
 
 /* No non-printers; use the RFC 822 quoting rules */
 
+if (!len)
+  {
+  return string_copy_taint_function("", is_tainted(phrase));
+  }
+
 buffer = store_get(len*4, is_tainted(phrase));
 
 s = phrase;