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Backported from 5.6.26 by Remi.
Binary diff dropped.
From dd69327ad783ea93f1e0a9e358974c7b098f29cc Mon Sep 17 00:00:00 2001
From: Stanislav Malyshev <stas@php.net>
Date: Sun, 4 Sep 2016 22:07:35 -0700
Subject: [PATCH] Fix bug #72928 - Out of bound when verify signature of zip
phar in phar_parse_zipfile
---
ext/phar/tests/bug72928.phpt | 18 ++++++++++++++++++
ext/phar/tests/bug72928.zip | Bin 0 -> 140 bytes
ext/phar/util.c | 28 ++++++++++++++++++++++++++++
ext/phar/zip.c | 2 +-
4 files changed, 47 insertions(+), 1 deletion(-)
create mode 100644 ext/phar/tests/bug72928.phpt
create mode 100644 ext/phar/tests/bug72928.zip
diff --git a/ext/phar/util.c b/ext/phar/util.c
index 4bbd867..828be8f 100644
--- a/ext/phar/util.c
+++ b/ext/phar/util.c
@@ -1928,6 +1928,13 @@ int phar_verify_signature(php_stream *fp, size_t end_of_phar, php_uint32 sig_typ
unsigned char digest[64];
PHP_SHA512_CTX context;
+ if (sig_len < sizeof(digest)) {
+ if (error) {
+ spprintf(error, 0, "broken signature");
+ }
+ return FAILURE;
+ }
+
PHP_SHA512Init(&context);
read_len = end_of_phar;
@@ -1961,6 +1968,13 @@ int phar_verify_signature(php_stream *fp, size_t end_of_phar, php_uint32 sig_typ
unsigned char digest[32];
PHP_SHA256_CTX context;
+ if (sig_len < sizeof(digest)) {
+ if (error) {
+ spprintf(error, 0, "broken signature");
+ }
+ return FAILURE;
+ }
+
PHP_SHA256Init(&context);
read_len = end_of_phar;
@@ -2002,6 +2016,13 @@ int phar_verify_signature(php_stream *fp, size_t end_of_phar, php_uint32 sig_typ
unsigned char digest[20];
PHP_SHA1_CTX context;
+ if (sig_len < sizeof(digest)) {
+ if (error) {
+ spprintf(error, 0, "broken signature");
+ }
+ return FAILURE;
+ }
+
PHP_SHA1Init(&context);
read_len = end_of_phar;
@@ -2035,6 +2056,13 @@ int phar_verify_signature(php_stream *fp, size_t end_of_phar, php_uint32 sig_typ
unsigned char digest[16];
PHP_MD5_CTX context;
+ if (sig_len < sizeof(digest)) {
+ if (error) {
+ spprintf(error, 0, "broken signature");
+ }
+ return FAILURE;
+ }
+
PHP_MD5Init(&context);
read_len = end_of_phar;
diff --git a/ext/phar/zip.c b/ext/phar/zip.c
index bf895e7..ed156a2 100644
--- a/ext/phar/zip.c
+++ b/ext/phar/zip.c
@@ -430,7 +430,7 @@ int phar_parse_zipfile(php_stream *fp, char *fname, int fname_len, char *alias,
php_stream_seek(fp, sizeof(phar_zip_file_header) + entry.header_offset + entry.filename_len + PHAR_GET_16(zipentry.extra_len), SEEK_SET);
sig = (char *) emalloc(entry.uncompressed_filesize);
read = php_stream_read(fp, sig, entry.uncompressed_filesize);
- if (read != entry.uncompressed_filesize) {
+ if (read != entry.uncompressed_filesize || read <= 8) {
php_stream_close(sigfile);
efree(sig);
PHAR_ZIP_FAIL("signature cannot be read");
|
