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-rw-r--r--gnu/packages/patches/libarchive-CVE-2016-1541.patch67
1 files changed, 67 insertions, 0 deletions
diff --git a/gnu/packages/patches/libarchive-CVE-2016-1541.patch b/gnu/packages/patches/libarchive-CVE-2016-1541.patch
new file mode 100644
index 0000000000..6ac8773244
--- /dev/null
+++ b/gnu/packages/patches/libarchive-CVE-2016-1541.patch
@@ -0,0 +1,67 @@
+Fix CVE-2016-1541 (buffer overflow zip_read_mac_metadata)
+
+Taken from upstream source repository:
+https://github.com/libarchive/libarchive/commit/d0331e8e5b05b475f20b1f3101fe1ad772d7e7e7
+
+When reading OS X metadata entries in Zip archives that were stored
+without compression, libarchive would use the uncompressed entry size
+to allocate a buffer but would use the compressed entry size to limit
+the amount of data copied into that buffer. Since the compressed
+and uncompressed sizes are provided by data in the archive itself,
+an attacker could manipulate these values to write data beyond
+the end of the allocated buffer.
+
+This fix provides three new checks to guard against such
+manipulation and to make libarchive generally more robust when
+handling this type of entry:
+ 1. If an OS X metadata entry is stored without compression,
+ abort the entire archive if the compressed and uncompressed
+ data sizes do not match.
+ 2. When sanity-checking the size of an OS X metadata entry,
+ abort this entry if either the compressed or uncompressed
+ size is larger than 4MB.
+ 3. When copying data into the allocated buffer, check the copy
+ size against both the compressed entry size and uncompressed
+ entry size.
+---
+ libarchive/archive_read_support_format_zip.c | 13 +++++++++++++
+ 1 file changed, 13 insertions(+)
+
+diff --git a/libarchive/archive_read_support_format_zip.c b/libarchive/archive_read_support_format_zip.c
+index 0f8262c..0a0be96 100644
+--- a/libarchive/archive_read_support_format_zip.c
++++ b/libarchive/archive_read_support_format_zip.c
+@@ -2778,6 +2778,11 @@ zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
+
+ switch(rsrc->compression) {
+ case 0: /* No compression. */
++ if (rsrc->uncompressed_size != rsrc->compressed_size) {
++ archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
++ "Malformed OS X metadata entry: inconsistent size");
++ return (ARCHIVE_FATAL);
++ }
+ #ifdef HAVE_ZLIB_H
+ case 8: /* Deflate compression. */
+ #endif
+@@ -2798,6 +2803,12 @@ zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
+ (intmax_t)rsrc->uncompressed_size);
+ return (ARCHIVE_WARN);
+ }
++ if (rsrc->compressed_size > (4 * 1024 * 1024)) {
++ archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
++ "Mac metadata is too large: %jd > 4M bytes",
++ (intmax_t)rsrc->compressed_size);
++ return (ARCHIVE_WARN);
++ }
+
+ metadata = malloc((size_t)rsrc->uncompressed_size);
+ if (metadata == NULL) {
+@@ -2836,6 +2847,8 @@ zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
+ bytes_avail = remaining_bytes;
+ switch(rsrc->compression) {
+ case 0: /* No compression. */
++ if ((size_t)bytes_avail > metadata_bytes)
++ bytes_avail = metadata_bytes;
+ memcpy(mp, p, bytes_avail);
+ bytes_used = (size_t)bytes_avail;
+ metadata_bytes -= bytes_used;