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authorPetr Štetiar <ynezz@true.cz>2022-08-06 14:55:07 +0200
committerPetr Štetiar <ynezz@true.cz>2022-08-06 15:00:08 +0200
commit7df6795d4c25447683fd4b4a4813bebcddaea547 (patch)
treeaa4d160e103d1dc5355a569525f2ec54e1bf6bdc /package
parent98df6bd99c0f70d4f2ad709af09084f985689ff5 (diff)
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zlib: backport fix for heap-based buffer over-read (CVE-2022-37434)
zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field. NOTE: only applications that call inflateGetHeader are affected. Some common applications bundle the affected zlib source code but may be unable to call inflateGetHeader. Fixes: CVE-2022-37434 References: https://github.com/ivd38/zlib_overflow Signed-off-by: Petr Štetiar <ynezz@true.cz>
Diffstat (limited to 'package')
-rw-r--r--package/libs/zlib/patches/006-fix-CVE-2022-37434.patch32
1 files changed, 32 insertions, 0 deletions
diff --git a/package/libs/zlib/patches/006-fix-CVE-2022-37434.patch b/package/libs/zlib/patches/006-fix-CVE-2022-37434.patch
new file mode 100644
index 0000000000..dc84d3a1d3
--- /dev/null
+++ b/package/libs/zlib/patches/006-fix-CVE-2022-37434.patch
@@ -0,0 +1,32 @@
+From eff308af425b67093bab25f80f1ae950166bece1 Mon Sep 17 00:00:00 2001
+From: Mark Adler <fork@madler.net>
+Date: Sat, 30 Jul 2022 15:51:11 -0700
+Subject: [PATCH] Fix a bug when getting a gzip header extra field with
+ inflate().
+
+If the extra field was larger than the space the user provided with
+inflateGetHeader(), and if multiple calls of inflate() delivered
+the extra header data, then there could be a buffer overflow of the
+provided space. This commit assures that provided space is not
+exceeded.
+---
+ inflate.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/inflate.c b/inflate.c
+index 7be8c6366..7a7289749 100644
+--- a/inflate.c
++++ b/inflate.c
+@@ -763,9 +763,10 @@ int flush;
+ copy = state->length;
+ if (copy > have) copy = have;
+ if (copy) {
++ len = state->head->extra_len - state->length;
+ if (state->head != Z_NULL &&
+- state->head->extra != Z_NULL) {
+- len = state->head->extra_len - state->length;
++ state->head->extra != Z_NULL &&
++ len < state->head->extra_max) {
+ zmemcpy(state->head->extra + len, next,
+ len + copy > state->head->extra_max ?
+ state->head->extra_max - len : copy);