Exploitalert - Database of Exploits

libsndfile flac_buffer_copy buffer overflow

CVE	Category	Price	Severity
CVE-2017-7585	CWE-119	$10,000	High

Author	Risk	Exploitation Type	Date
rh0	Critical	Local	2017-04-16

CPE
cpe:cpe:/a:michael_smith:libsndfile:1.0.28

CVSS	EPSS	EPSSP
CVSS:4.0/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
Scope		S	An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2017040102

libsndfile flac_buffer_copy buffer overflowDescription: libsndfile is a C library for reading and writing files containing sampled sound. A fuzz via the sndfile-resample command-line tool of libsamplerate, discovered and invalid memory read and an invalid memory write. The upstream author Erik de Castro Lopo (erikd) said that they was fixed in the recent commit 60b234301adf258786d8b90be5c1d437fc8799e0 which addresses CVE-2017-7585. As usual Im providing the stacktrace and the reproducer so that all release distros can test and check if their version is affected or not. The complete ASan output: # sndfile-resample -to 24000 -c 1 $FILE out ==959==ERROR: AddressSanitizer: SEGV on unknown address 0x0000013cc000 (pc 0x7fc1ba91251c bp 0x60e000000040 sp 0x7fff95597f70 T0) ==959==The signal is caused by a WRITE memory access. #0 0x7fc1ba91251b in flac_buffer_copy /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/flac.c:264 #1 0x7fc1ba913404 in flac_read_loop /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/flac.c:884 #2 0x7fc1ba913505 in flac_read_flac2f /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/flac.c:949 #3 0x7fc1ba907a49 in sf_readf_float /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/sndfile.c:1870 #4 0x5135c5 in sample_rate_convert /tmp/portage/media-libs/libsamplerate-0.1.8-r1/work/libsamplerate-0.1.8/examples/sndfile-resample.c:213:29 #5 0x5135c5 in main /tmp/portage/media-libs/libsamplerate-0.1.8-r1/work/libsamplerate-0.1.8/examples/sndfile-resample.c:163 #6 0x7fc1b9a4178f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289 #7 0x419f88 in _init (/usr/bin/sndfile-resample+0x419f88) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/flac.c:264 in flac_buffer_copy ==959==ABORTING Reproducer: https://github.com/asarubbo/poc/blob/master/00261-libsndfile-invalidwrite-flac_buffer_copy CVE: CVE-2017-7741 ################# # sndfile-resample -to 24000 -c 1 $FILE out ==32533==ERROR: AddressSanitizer: SEGV on unknown address 0x000000004000 (pc 0x7f576a5e8512 bp 0x60e000000040 sp 0x7ffeab4e66d0 T0) ==32533==The signal is caused by a READ memory access. #0 0x7f576a5e8511 in flac_buffer_copy /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/flac.c:263 #1 0x7f576a5e9404 in flac_read_loop /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/flac.c:884 #2 0x7f576a5e9505 in flac_read_flac2f /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/flac.c:949 #3 0x7f576a5dda49 in sf_readf_float /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/sndfile.c:1870 #4 0x5135c5 in sample_rate_convert /tmp/portage/media-libs/libsamplerate-0.1.8-r1/work/libsamplerate-0.1.8/examples/sndfile-resample.c:213:29 #5 0x5135c5 in main /tmp/portage/media-libs/libsamplerate-0.1.8-r1/work/libsamplerate-0.1.8/examples/sndfile-resample.c:163 #6 0x7f576971778f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289 #7 0x419f88 in _init (/usr/bin/sndfile-resample+0x419f88) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /tmp/portage/media-libs/libsndfile-1.0.27-r1/work/libsndfile-1.0.27/src/flac.c:263 in flac_buffer_copy ==32533==ABORTING Reproducer: https://github.com/asarubbo/poc/blob/master/00260-libsndfile-invalidread-flac_buffer_copy CVE: CVE-2017-7742 Affected version: 1.0.27 Fixed version: 1.0.28 Commit fix: https://github.com/erikd/libsndfile/commit/60b234301adf258786d8b90be5c1d437fc8799e0 Credit: This bug was discovered by Agostino Sarubbo of Gentoo. CVE: Reproducer: Timeline: 2017-04-11: bug discovered and reported to upstream 2017-04-11: blog post about the issue Note: This bug was found with American Fuzzy Lop. Permalink: https://blogs.gentoo.org/ago/2017/04/11/libsndfile-invalid-memory-read-and-invalid-memory-write-in -- Agostino Sarubbo Gentoo Linux Developer

Impressum