diff options
Diffstat (limited to 'php-bug81726.patch')
| -rw-r--r-- | php-bug81726.patch | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/php-bug81726.patch b/php-bug81726.patch new file mode 100644 index 0000000..c096202 --- /dev/null +++ b/php-bug81726.patch @@ -0,0 +1,151 @@ +From d8a9f171c029dd4260544c46d560e67f95f99690 Mon Sep 17 00:00:00 2001 +From: "Christoph M. Becker" <cmbecker69@gmx.de> +Date: Mon, 25 Jul 2022 15:58:59 +0200 +Subject: [PATCH 2/3] Fix #81726: phar wrapper: DOS when using quine gzip file + +The phar wrapper needs to uncompress the file; the uncompressed file +might be compressed, so the wrapper implementation loops. This raises +potential DOS issues regarding too deep or even infinite recursion (the +latter are called compressed file quines[1]). We avoid that by +introducing a recursion limit; we choose the somewhat arbitrary limit +`3`. + +This issue has been reported by real_as3617 and gPayl0ad. + +[1] <https://honno.dev/gzip-quine/> + +(cherry picked from commit 404e8bdb68350931176a5bdc86fc417b34fb583d) +(cherry picked from commit 96fda78bcddd1d793cf2d0ee463dbb49621b577f) +--- + NEWS | 2 ++ + ext/phar/phar.c | 16 +++++++++++----- + ext/phar/tests/bug81726.gz | Bin 0 -> 204 bytes + ext/phar/tests/bug81726.phpt | 14 ++++++++++++++ + 4 files changed, 27 insertions(+), 5 deletions(-) + create mode 100644 ext/phar/tests/bug81726.gz + create mode 100644 ext/phar/tests/bug81726.phpt + +diff --git a/NEWS b/NEWS +index 6b14f93031..4b6fcd65e0 100644 +--- a/NEWS ++++ b/NEWS +@@ -4,6 +4,8 @@ PHP NEWS + Backported from 7.4.31 + + - Core: ++ . Fixed bug #81726: phar wrapper: DOS when using quine gzip file. ++ (CVE-2022-31628). (cmb) + . Fixed bug #81727: Don't mangle HTTP variable names that clash with ones + that have a specific semantic meaning. (CVE-2022-31629). (Derick) + +diff --git a/ext/phar/phar.c b/ext/phar/phar.c +index 850a6e6c46..a7f776efa4 100644 +--- a/ext/phar/phar.c ++++ b/ext/phar/phar.c +@@ -1579,7 +1579,8 @@ static int phar_open_from_fp(php_stream* fp, char *fname, int fname_len, char *a + const char zip_magic[] = "PK\x03\x04"; + const char gz_magic[] = "\x1f\x8b\x08"; + const char bz_magic[] = "BZh"; +- char *pos, test = '\0'; ++ char *pos; ++ int recursion_count = 3; // arbitrary limit to avoid too deep or even infinite recursion + const int window_size = 1024; + char buffer[1024 + sizeof(token)]; /* a 1024 byte window + the size of the halt_compiler token (moving window) */ + const long readsize = sizeof(buffer) - sizeof(token); +@@ -1607,8 +1608,7 @@ static int phar_open_from_fp(php_stream* fp, char *fname, int fname_len, char *a + MAPPHAR_ALLOC_FAIL("internal corruption of phar \"%s\" (truncated entry)") + } + +- if (!test) { +- test = '\1'; ++ if (recursion_count) { + pos = buffer+tokenlen; + if (!memcmp(pos, gz_magic, 3)) { + char err = 0; +@@ -1668,7 +1668,10 @@ static int phar_open_from_fp(php_stream* fp, char *fname, int fname_len, char *a + compression = PHAR_FILE_COMPRESSED_GZ; + + /* now, start over */ +- test = '\0'; ++ if (!--recursion_count) { ++ MAPPHAR_ALLOC_FAIL("unable to decompress gzipped phar archive \"%s\""); ++ break; ++ } + continue; + } else if (!memcmp(pos, bz_magic, 3)) { + php_stream_filter *filter; +@@ -1706,7 +1709,10 @@ static int phar_open_from_fp(php_stream* fp, char *fname, int fname_len, char *a + compression = PHAR_FILE_COMPRESSED_BZ2; + + /* now, start over */ +- test = '\0'; ++ if (!--recursion_count) { ++ MAPPHAR_ALLOC_FAIL("unable to decompress bzipped phar archive \"%s\""); ++ break; ++ } + continue; + } + +-- +2.37.3 + +From 8ba7c1b6dbb0f34ce5087792965648779c12bddb Mon Sep 17 00:00:00 2001 +From: "Christoph M. Becker" <cmbecker69@gmx.de> +Date: Tue, 27 Sep 2022 17:43:40 +0200 +Subject: [PATCH 3/3] Fix regression introduced by fixing bug 81726 + +When a tar phar is created, `phar_open_from_fp()` is also called, but +since the file has just been created, none of the format checks can +succeed, so we continue to loop, but must not check again for the +format. Therefore, we bring back the old `test` variable. + +Closes GH-9620. + +(cherry picked from commit 432bf196d59bcb661fcf9cb7029cea9b43f490af) +(cherry picked from commit 535c3f592d020a3a43f4ce3577e505d64297b6e8) +--- + ext/phar/phar.c | 7 +++++-- + 1 file changed, 5 insertions(+), 2 deletions(-) + +diff --git a/ext/phar/phar.c b/ext/phar/phar.c +index a7f776efa4..45190e22aa 100644 +--- a/ext/phar/phar.c ++++ b/ext/phar/phar.c +@@ -1579,7 +1579,7 @@ static int phar_open_from_fp(php_stream* fp, char *fname, int fname_len, char *a + const char zip_magic[] = "PK\x03\x04"; + const char gz_magic[] = "\x1f\x8b\x08"; + const char bz_magic[] = "BZh"; +- char *pos; ++ char *pos, test = '\0'; + int recursion_count = 3; // arbitrary limit to avoid too deep or even infinite recursion + const int window_size = 1024; + char buffer[1024 + sizeof(token)]; /* a 1024 byte window + the size of the halt_compiler token (moving window) */ +@@ -1608,7 +1608,8 @@ static int phar_open_from_fp(php_stream* fp, char *fname, int fname_len, char *a + MAPPHAR_ALLOC_FAIL("internal corruption of phar \"%s\" (truncated entry)") + } + +- if (recursion_count) { ++ if (!test && recursion_count) { ++ test = '\1'; + pos = buffer+tokenlen; + if (!memcmp(pos, gz_magic, 3)) { + char err = 0; +@@ -1668,6 +1669,7 @@ static int phar_open_from_fp(php_stream* fp, char *fname, int fname_len, char *a + compression = PHAR_FILE_COMPRESSED_GZ; + + /* now, start over */ ++ test = '\0'; + if (!--recursion_count) { + MAPPHAR_ALLOC_FAIL("unable to decompress gzipped phar archive \"%s\""); + break; +@@ -1709,6 +1711,7 @@ static int phar_open_from_fp(php_stream* fp, char *fname, int fname_len, char *a + compression = PHAR_FILE_COMPRESSED_BZ2; + + /* now, start over */ ++ test = '\0'; + if (!--recursion_count) { + MAPPHAR_ALLOC_FAIL("unable to decompress bzipped phar archive \"%s\""); + break; +-- +2.37.3 + |