Related Weaknesses
| CWE-ID |
Weakness Name |
Source |
| CWE-476 |
NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL. |
|
Metrics
| Metrics |
Score |
Severity |
CVSS Vector |
Source |
| V3.0 |
5.5 |
MEDIUM |
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Base: Exploitabilty MetricsThe Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. A vulnerability exploitable with Local access means that the vulnerable component is not bound to the network stack, and the attacker's path is via read/write/execute capabilities. In some cases, the attacker may be logged in locally in order to exploit the vulnerability, otherwise, she may rely on User Interaction to execute a malicious file. Attack Complexity This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability. Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack. User Interaction This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component. Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator. Base: Scope MetricsAn important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges. Scope Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports. An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same. Base: Impact MetricsThe Impact metrics refer to the properties of the impacted component. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. There is no loss of confidentiality within the impacted component. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. There is no loss of integrity within the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable). Temporal MetricsThe Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability. Environmental Metrics
|
[email protected] |
| V2 |
4.3 |
|
AV:N/AC:M/Au:N/C:N/I:N/A:P |
[email protected] |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 42399
Publication date : 2017-07-30 22h00 +00:00
Author : qflb.wu
EDB Verified : No
libvorbis multiple vulnerabilities
================
Author : qflb.wu
===============
Introduction:
=============
The libvorbis package contains a general purpose audio and music encoding format. This is useful for creating (encoding) and playing (decoding) sound in an open (patent free) format.
Affected version:
=====
1.3.5
Vulnerability Description:
==========================
1.
the vorbis_analysis_wrote function in lib/block.c in Xiph.Org libvorbis 1.3.5 can cause a denial of service(OOM) via a crafted wav file.
I found this bug when I test Sound eXchange(SoX) 14.4.2 which used the libvorbis library.
./sox libvorbis_1.3.5_OOM.wav out.ogg
/var/log/syslog info:
Jul 13 19:58:05 ubuntu kernel: [] Out of memory: Kill process 44203 (sox) score 364 or sacrifice child
Jul 13 19:58:05 ubuntu kernel: [] Killed process 44203 (sox) total-vm:1831804kB, anon-rss:599932kB, file-rss:40kB
----debug info:----
#0 0x00007ffff5df5e92 in vorbis_analysis_wrote ()
from /usr/local/lib/libvorbis.so.0
#1 0x00007ffff7ba1cba in write_samples (ft=0x611c20, buf=buf@entry=0x0,
len=len@entry=0x0) at vorbis.c:358
#2 0x00007ffff7ba1dc5 in stopwrite (ft=<optimized out>) at vorbis.c:398
#3 0x00007ffff7b58488 in sox_close (ft=0x611c20) at formats.c:1006
#4 0x0000000000405fa8 in cleanup () at sox.c:246
#5 0x0000000000403479 in main (argc=argc@entry=0x3,
argv=argv@entry=0x7fffffffe5e8) at sox.c:3050
#6 0x00007ffff727bec5 in __libc_start_main (main=0x4029c0 <main>, argc=0x3,
argv=0x7fffffffe5e8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffe5d8) at libc-start.c:287
#7 0x0000000000403c65 in _start ()
--------
Program terminated with signal SIGKILL, Killed.
The program no longer exists.
POC:
libvorbis_1.3.5_OOM.wav
CVE:
CVE-2017-11333
2.
the vorbis_block_clear function in lib/block.c in Xiph.Org libvorbis 1.3.5 can cause a denial of service(NULL pointer dereference and application crash) via a crafted ogg file.
I found this bug when I test mp3splt 2.6.2 which used the libvorbis library.
./mp3splt -P -t 0.9 libvorbis_1.3.5_null_pointer_dereference.ogg
----debug info:----
0x00007ffff61752c0 in vorbis_block_clear () from /usr/local/lib/libvorbis.so.0
(gdb) disassemble
Dump of assembler code for function vorbis_block_clear:
0x00007ffff61752a0 <+0>:push %r14
0x00007ffff61752a2 <+2>:mov %rdi,%r14
0x00007ffff61752a5 <+5>:push %r13
0x00007ffff61752a7 <+7>:push %r12
0x00007ffff61752a9 <+9>:push %rbp
0x00007ffff61752aa <+10>:push %rbx
0x00007ffff61752ab <+11>:mov 0xb8(%rdi),%r13
0x00007ffff61752b2 <+18>:callq 0x7ffff616b240 <_vorbis_block_ripcord@plt>
0x00007ffff61752b7 <+23>:mov 0x70(%r14),%rdi
0x00007ffff61752bb <+27>:test %rdi,%rdi
0x00007ffff61752be <+30>:je 0x7ffff61752c5 <vorbis_block_clear+37>
=> 0x00007ffff61752c0 <+32>:callq 0x7ffff616b130 <free@plt>
0x00007ffff61752c5 <+37>:test %r13,%r13
0x00007ffff61752c8 <+40>:je 0x7ffff617530c <vorbis_block_clear+108>
0x00007ffff61752ca <+42>:mov $0x1,%r12d
0x00007ffff61752d0 <+48>:xor %ebx,%ebx
0x00007ffff61752d2 <+50>:jmp 0x7ffff61752df <vorbis_block_clear+63>
0x00007ffff61752d4 <+52>:nopl 0x0(%rax)
0x00007ffff61752d8 <+56>:add $0x1,%ebx
0x00007ffff61752db <+59>:add $0x1,%r12d
0x00007ffff61752df <+63>:movslq %ebx,%rax
---Type <return> to continue, or q <return> to quit---q
Quit
(gdb) i r
rax 0x22
rbx 0x61fca06421664
rcx 0x00
rdx 0x7ffff7ba6778140737349576568
rsi 0x00
rdi 0x80128
rbp 0x7fffffffd4700x7fffffffd470
rsp 0x7fffffffd4000x7fffffffd400
r8 0x746e656d75636f008389754676633104128
r9 0x6143506374224
r10 0x7fffffffd1f0140737488343536
r11 0x7ffff61752a0140737322111648
r12 0x6128506367312
r13 0x00
r14 0x6205606423904
r15 0x7ffff7bcf146140737349742918
rip 0x7ffff61752c00x7ffff61752c0 <vorbis_block_clear+32>
eflags 0x202[ IF ]
cs 0x3351
ss 0x2b43
ds 0x00
es 0x00
fs 0x00
---Type <return> to continue, or q <return> to quit---
gs 0x00
(gdb) ni
Program received signal SIGSEGV, Segmentation fault.
__GI___libc_free (mem=0x80) at malloc.c:2929
2929malloc.c: No such file or directory.
(gdb) bt
#0 __GI___libc_free (mem=0x80) at malloc.c:2929
#1 0x00007ffff61752c5 in vorbis_block_clear ()
from /usr/local/lib/libvorbis.so.0
#2 0x00007ffff65ac5ae in splt_ogg_v_free (oggstate=0x61fca0) at ogg.c:162
#3 0x00007ffff65ace0b in splt_ogg_info (in=<optimized out>,
state=state@entry=0x60ddb0, error=error@entry=0x7fffffffdbf0) at ogg.c:545
#4 0x00007ffff65acf75 in splt_ogg_get_info (state=state@entry=0x60ddb0,
file_input=<optimized out>, error=error@entry=0x7fffffffdbf0) at ogg.c:108
#5 0x00007ffff65ae6c7 in splt_pl_init (state=0x60ddb0, error=0x7fffffffdbf0)
at ogg.c:1482
#6 0x00007ffff7bcac16 in splt_tp_get_original_tags_and_append (
error=0x7fffffffdbf0, state=0x60ddb0) at tags_parser.c:545
#7 splt_tp_process_original_tags_variable (tpu=tpu@entry=0x61f800,
state=state@entry=0x60ddb0, error=error@entry=0x7fffffffdbf0,
set_original_tags=1) at tags_parser.c:514
#8 0x00007ffff7bcb4d1 in splt_tp_process_tag_variable (error=0x7fffffffdbf0,
state=0x60ddb0, tpu=0x61f800, end_paranthesis=0x7ffff7bcf14c "]",
tag_variable_start=0x7ffff7bcf146 "o,@N=1]") at tags_parser.c:363
#9 splt_tp_process_tags (error=0x7fffffffdbf0, state=0x60ddb0, tpu=0x61f800,
tags=0x7ffff7bcf143 "%[@o,@N=1]") at tags_parser.c:293
#10 splt_tp_put_tags_from_string (state=state@entry=0x60ddb0,
tags=tags@entry=0x7ffff7bcf143 "%[@o,@N=1]",
error=error@entry=0x7fffffffdbf0) at tags_parser.c:192
---Type <return> to continue, or q <return> to quit---
#11 0x00007ffff7bbb4f3 in mp3splt_split (state=state@entry=0x60ddb0)
at mp3splt.c:1232
#12 0x0000000000403320 in main (argc=<optimized out>,
orig_argv=<optimized out>) at mp3splt.c:872
(gdb)
--------------------
int vorbis_block_clear(vorbis_block *vb){
int i;
vorbis_block_internal *vbi=vb->internal;
_vorbis_block_ripcord(vb);
if(vb->localstore)_ogg_free(vb->localstore); <========
if(vbi){
for(i=0;i<PACKETBLOBS;i++){
oggpack_writeclear(vbi->packetblob[i]);
if(i!=PACKETBLOBS/2)_ogg_free(vbi->packetblob[i]);
}
_ogg_free(vbi);
}
memset(vb,0,sizeof(*vb));
return(0);
}
POC:
libvorbis_1.3.5_null_pointer_dereference.ogg
CVE:
CVE-2017-11735
Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42399.zip
Products Mentioned
Configuraton 0
Xiph.org>>Libvorbis >> Version 1.3.5
References
