From: Leo Famulari <leo@famulari.name>
To: 30180@debbugs.gnu.org
Subject: [bug#30180] [PATCH] gnu: libsndfile: Fix CVE-2017-12562.
Date: Fri, 19 Jan 2018 18:07:45 -0800 [thread overview]
Message-ID: <4ce9653c4e8ec4b70e53d2608a2551bb0831c1d0.1516414012.git.leo@famulari.name> (raw)
I'd like to ungraft this on core-updates, even though it's late in the
core-updates cycle. Changing libsndfile requires only ~600 rebuilds per
architecture.
* gnu/packages/patches/libsndfile-CVE-2017-12562.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/pulseaudio.scm (libsndfile)[replacement]: New field.
(libsndfile/fixed): New variable.
---
gnu/local.mk | 1 +
.../patches/libsndfile-CVE-2017-12562.patch | 97 ++++++++++++++++++++++
gnu/packages/pulseaudio.scm | 10 +++
3 files changed, 108 insertions(+)
create mode 100644 gnu/packages/patches/libsndfile-CVE-2017-12562.patch
diff --git a/gnu/local.mk b/gnu/local.mk
index 240554fe4..80e7527e4 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -837,6 +837,7 @@ dist_patch_DATA = \
%D%/packages/patches/libsndfile-armhf-type-checks.patch \
%D%/packages/patches/libsndfile-CVE-2017-8361-8363-8365.patch \
%D%/packages/patches/libsndfile-CVE-2017-8362.patch \
+ %D%/packages/patches/libsndfile-CVE-2017-12562.patch \
%D%/packages/patches/libssh-hostname-parser-bug.patch \
%D%/packages/patches/libssh2-fix-build-failure-with-gcrypt.patch \
%D%/packages/patches/libtar-CVE-2013-4420.patch \
diff --git a/gnu/packages/patches/libsndfile-CVE-2017-12562.patch b/gnu/packages/patches/libsndfile-CVE-2017-12562.patch
new file mode 100644
index 000000000..58cb242b1
--- /dev/null
+++ b/gnu/packages/patches/libsndfile-CVE-2017-12562.patch
@@ -0,0 +1,97 @@
+Fix CVE-2017-12562:
+
+https://github.com/erikd/libsndfile/issues/292
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12562
+
+Patch copied from upstream source repository:
+
+https://github.com/erikd/libsndfile/commit/cf7a8182c2642c50f1cf90dddea9ce96a8bad2e8
+
+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) ;
diff --git a/gnu/packages/pulseaudio.scm b/gnu/packages/pulseaudio.scm
index ba288aa44..39f54437c 100644
--- a/gnu/packages/pulseaudio.scm
+++ b/gnu/packages/pulseaudio.scm
@@ -47,6 +47,7 @@
(define-public libsndfile
(package
(name "libsndfile")
+ (replacement libsndfile/fixed)
(version "1.0.28")
(source (origin
(method url-fetch)
@@ -80,6 +81,15 @@ SPARC. Hopefully the design of the library will also make it easy to extend
for reading and writing new sound file formats.")
(license l:gpl2+)))
+(define libsndfile/fixed
+ (package
+ (inherit libsndfile)
+ (source (origin
+ (inherit (package-source libsndfile))
+ (patches (append
+ (origin-patches (package-source libsndfile))
+ (search-patches "libsndfile-CVE-2017-12562.patch")))))))
+
(define-public libsamplerate
(package
(name "libsamplerate") ; aka. Secret Rabbit Code (SRC)
--
2.16.0
next reply other threads:[~2018-01-20 2:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-20 2:07 Leo Famulari [this message]
2018-01-23 9:20 ` [bug#30180] [PATCH] gnu: libsndfile: Fix CVE-2017-12562 Ludovic Courtès
2018-01-23 20:25 ` bug#30180: " Leo Famulari
2018-01-24 13:59 ` [bug#30180] " Ludovic Courtès
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