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-rw-r--r--gnu/packages/patches/exim-CVE-2017-16943.patch65
1 files changed, 65 insertions, 0 deletions
diff --git a/gnu/packages/patches/exim-CVE-2017-16943.patch b/gnu/packages/patches/exim-CVE-2017-16943.patch
new file mode 100644
index 0000000000..3a3e5d27fa
--- /dev/null
+++ b/gnu/packages/patches/exim-CVE-2017-16943.patch
@@ -0,0 +1,65 @@
+Fix CVE-2017-16943:
+
+https://bugs.exim.org/show_bug.cgi?id=2199
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16943
+
+Patch copied from upstream source repository:
+
+https://git.exim.org/exim.git/commit/4090d62a4b25782129cc1643596dc2f6e8f63bde
+
+From 4090d62a4b25782129cc1643596dc2f6e8f63bde Mon Sep 17 00:00:00 2001
+From: Jeremy Harris <jgh146exb@wizmail.org>
+Date: Fri, 24 Nov 2017 20:22:33 +0000
+Subject: [PATCH] Avoid release of store if there have been later allocations.
+ Bug 2199
+
+---
+ doc/doc-txt/ChangeLog | 4 ++++
+ src/src/receive.c | 7 ++++---
+ 2 files changed, 8 insertions(+), 3 deletions(-)
+
+#diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
+#index e937ba2..a2d9339 100644
+#--- a/doc/doc-txt/ChangeLog
+#+++ b/doc/doc-txt/ChangeLog
+#@@ -59,6 +59,10 @@ JH/30 Fix a logging bug on aarch64: an unsafe routine was previously used for
+# connection in response to HELO" was logged instead of the actual 4xx
+# error for the HELO.
+#
+#+JH/34 Bug 2199: fix a use-after-free while reading smtp input for header lines.
+#+ A crafted sequence of BDAT commands could result in in-use memory beeing
+#+ freed.
+#+
+#
+ Exim version 4.89
+ -----------------
+diff --git a/src/src/receive.c b/src/src/receive.c
+index 95cf13e..20672db 100644
+--- a/src/receive.c
++++ b/src/receive.c
+@@ -1772,8 +1772,8 @@ for (;;)
+ (and sometimes lunatic messages can have ones that are 100s of K long) we
+ call store_release() for strings that have been copied - if the string is at
+ the start of a block (and therefore the only thing in it, because we aren't
+- doing any other gets), the block gets freed. We can only do this because we
+- know there are no other calls to store_get() going on. */
++ doing any other gets), the block gets freed. We can only do this release if
++ there were no allocations since the once that we want to free. */
+
+ if (ptr >= header_size - 4)
+ {
+@@ -1782,9 +1782,10 @@ for (;;)
+ header_size *= 2;
+ if (!store_extend(next->text, oldsize, header_size))
+ {
++ BOOL release_ok = store_last_get[store_pool] == next->text;
+ uschar *newtext = store_get(header_size);
+ memcpy(newtext, next->text, ptr);
+- store_release(next->text);
++ if (release_ok) store_release(next->text);
+ next->text = newtext;
+ }
+ }
+--
+1.9.1
+