aboutsummaryrefslogtreecommitdiffstats
path: root/main/libsndfile/CVE-2017-12562.patch
diff options
context:
space:
mode:
Diffstat (limited to 'main/libsndfile/CVE-2017-12562.patch')
-rw-r--r--main/libsndfile/CVE-2017-12562.patch88
1 files changed, 88 insertions, 0 deletions
diff --git a/main/libsndfile/CVE-2017-12562.patch b/main/libsndfile/CVE-2017-12562.patch
new file mode 100644
index 0000000000..f195e87e43
--- /dev/null
+++ b/main/libsndfile/CVE-2017-12562.patch
@@ -0,0 +1,88 @@
+From cf7a8182c2642c50f1cf90dddea9ce96a8bad2e8 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?J=C3=B6rn=20Heusipp?= <osmanx@problemloesungsmaschine.de>
+Date: Wed, 14 Jun 2017 12:25:40 +0200
+Subject: [PATCH] src/common.c: Fix heap buffer overflows when writing strings
+ in binheader
+
+Fixes the following problems:
+ 1. Case 's' only enlarges the buffer by 16 bytes instead of size bytes.
+ 2. psf_binheader_writef() enlarges the header buffer (if needed) prior to the
+ big switch statement by an amount (16 bytes) which is enough for all cases
+ where only a single value gets added. Cases 's', 'S', 'p' however
+ additionally write an arbitrary length block of data and again enlarge the
+ buffer to the required amount. However, the required space calculation does
+ not take into account the size of the length field which gets output before
+ the data.
+ 3. Buffer size requirement calculation in case 'S' does not account for the
+ padding byte ("size += (size & 1) ;" happens after the calculation which
+ uses "size").
+ 4. Case 'S' can overrun the header buffer by 1 byte when no padding is
+ involved
+ ("memcpy (&(psf->header.ptr [psf->header.indx]), strptr, size + 1) ;" while
+ the buffer is only guaranteed to have "size" space available).
+ 5. "psf->header.ptr [psf->header.indx] = 0 ;" in case 'S' always writes 1 byte
+ beyond the space which is guaranteed to be allocated in the header buffer.
+ 6. Case 's' can overrun the provided source string by 1 byte if padding is
+ involved ("memcpy (&(psf->header.ptr [psf->header.indx]), strptr, size) ;"
+ where "size" is "strlen (strptr) + 1" (which includes the 0 terminator,
+ plus optionally another 1 which is padding and not guaranteed to be
+ readable via the source string pointer).
+
+Closes: https://github.com/erikd/libsndfile/issues/292
+---
+ src/common.c | 15 +++++++--------
+ 1 file changed, 7 insertions(+), 8 deletions(-)
+
+diff --git a/src/common.c b/src/common.c
+index 1a6204ca..6b2a2ee9 100644
+--- a/src/common.c
++++ b/src/common.c
+@@ -681,16 +681,16 @@ psf_binheader_writef (SF_PRIVATE *psf, const char *format, ...)
+ /* Write a C string (guaranteed to have a zero terminator). */
+ strptr = va_arg (argptr, char *) ;
+ size = strlen (strptr) + 1 ;
+- size += (size & 1) ;
+
+- if (psf->header.indx + (sf_count_t) size >= psf->header.len && psf_bump_header_allocation (psf, 16))
++ if (psf->header.indx + 4 + (sf_count_t) size + (sf_count_t) (size & 1) > psf->header.len && psf_bump_header_allocation (psf, 4 + size + (size & 1)))
+ return count ;
+
+ if (psf->rwf_endian == SF_ENDIAN_BIG)
+- header_put_be_int (psf, size) ;
++ header_put_be_int (psf, size + (size & 1)) ;
+ else
+- header_put_le_int (psf, size) ;
++ header_put_le_int (psf, size + (size & 1)) ;
+ memcpy (&(psf->header.ptr [psf->header.indx]), strptr, size) ;
++ size += (size & 1) ;
+ psf->header.indx += size ;
+ psf->header.ptr [psf->header.indx - 1] = 0 ;
+ count += 4 + size ;
+@@ -703,16 +703,15 @@ psf_binheader_writef (SF_PRIVATE *psf, const char *format, ...)
+ */
+ strptr = va_arg (argptr, char *) ;
+ size = strlen (strptr) ;
+- if (psf->header.indx + (sf_count_t) size > psf->header.len && psf_bump_header_allocation (psf, size))
++ if (psf->header.indx + 4 + (sf_count_t) size + (sf_count_t) (size & 1) > psf->header.len && psf_bump_header_allocation (psf, 4 + size + (size & 1)))
+ return count ;
+ if (psf->rwf_endian == SF_ENDIAN_BIG)
+ header_put_be_int (psf, size) ;
+ else
+ header_put_le_int (psf, size) ;
+- memcpy (&(psf->header.ptr [psf->header.indx]), strptr, size + 1) ;
++ memcpy (&(psf->header.ptr [psf->header.indx]), strptr, size + (size & 1)) ;
+ size += (size & 1) ;
+ psf->header.indx += size ;
+- psf->header.ptr [psf->header.indx] = 0 ;
+ count += 4 + size ;
+ break ;
+
+@@ -724,7 +723,7 @@ psf_binheader_writef (SF_PRIVATE *psf, const char *format, ...)
+ size = (size & 1) ? size : size + 1 ;
+ size = (size > 254) ? 254 : size ;
+
+- if (psf->header.indx + (sf_count_t) size > psf->header.len && psf_bump_header_allocation (psf, size))
++ if (psf->header.indx + 1 + (sf_count_t) size > psf->header.len && psf_bump_header_allocation (psf, 1 + size))
+ return count ;
+
+ header_put_byte (psf, size) ;