CVE-2016-9813 : Détail

CVE-2016-9813

5.5
/
Moyen
Memory Corruption
0.92%V3
Local
2017-01-13
15h00 +00:00
2018-01-04
18h57 +00:00
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Descriptions du CVE

The _parse_pat function in the mpegts parser in GStreamer before 1.10.2 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted file.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-476 NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.

Métriques

Métriques Score Gravité CVSS Vecteur 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 Metrics

The 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.

Local

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.

Low

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.

None

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.

Required

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 Metrics

An 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.

Unchanged

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 Metrics

The 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.

None

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.

None

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.

High

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 Metrics

The 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

nvd@nist.gov
V2 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

Informations sur l'Exploit

Exploit Database EDB-ID : 42162

Date de publication : 2017-06-11 22h00 +00:00
Auteur : Hanno Boeck
EDB Vérifié : Yes

Source: https://bugzilla.gnome.org/show_bug.cgi?id=775120 The attached file will cause a null pointer access and segfault in the mpegts parser. Current git code, found with afl. ASAN stack trace: ================================================================= ==32545==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fe957185495 bp 0x60200002cf7a sp 0x7fe956e027a0 T2) ==32545==The signal is caused by a WRITE memory access. ==32545==Hint: address points to the zero page. #0 0x7fe957185494 in _parse_pat /f/gstreamer/gst-plugins-bad/gst-libs/gst/mpegts/gstmpegtssection.c:441:32 #1 0x7fe957184058 in __common_section_checks /f/gstreamer/gst-plugins-bad/gst-libs/gst/mpegts/gstmpegtssection.c:166:9 #2 0x7fe95718522f in gst_mpegts_section_get_pat /f/gstreamer/gst-plugins-bad/gst-libs/gst/mpegts/gstmpegtssection.c:480:9 #3 0x7fe957438b9a in mpegts_base_apply_pat /f/gstreamer/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c:942:20 #4 0x7fe957438b9a in mpegts_base_handle_psi /f/gstreamer/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c:1155 #5 0x7fe957437cd1 in mpegts_base_chain /f/gstreamer/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c:1424:11 #6 0x7fe9574341e7 in mpegts_base_loop /f/gstreamer/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c:1589:13 #7 0x7fe9644305c3 in gst_task_func /f/gstreamer/gstreamer/gst/gsttask.c:334:5 #8 0x7fe96362f867 (/usr/lib64/libglib-2.0.so.0+0x70867) #9 0x7fe96362eed4 (/usr/lib64/libglib-2.0.so.0+0x6fed4) #10 0x7fe9630ac443 in start_thread (/lib64/libpthread.so.0+0x7443) #11 0x7fe962bdb92c in clone (/lib64/libc.so.6+0xe792c) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /f/gstreamer/gst-plugins-bad/gst-libs/gst/mpegts/gstmpegtssection.c:441:32 in _parse_pat Thread T2 (tsdemux0:sink) created by T1 (typefind:sink) here: #0 0x42e26d in __interceptor_pthread_create (/usr/bin/gst-discoverer-1.0+0x42e26d) #1 0x7fe96364cadf (/usr/lib64/libglib-2.0.so.0+0x8dadf) Thread T1 (typefind:sink) created by T0 here: #0 0x42e26d in __interceptor_pthread_create (/usr/bin/gst-discoverer-1.0+0x42e26d) #1 0x7fe96364cadf (/usr/lib64/libglib-2.0.so.0+0x8dadf) ==32545==ABORTING Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42162.zip

Products Mentioned

Configuraton 0

Gstreamer>>Gstreamer >> Version To (including) 1.10.1

Références

http://www.debian.org/security/2017/dsa-3818
Tags : vendor-advisory, x_refsource_DEBIAN
http://rhn.redhat.com/errata/RHSA-2017-0021.html
Tags : vendor-advisory, x_refsource_REDHAT
https://www.exploit-db.com/exploits/42162/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.openwall.com/lists/oss-security/2016/12/05/8
Tags : mailing-list, x_refsource_MLIST
http://www.securityfocus.com/bid/95158
Tags : vdb-entry, x_refsource_BID
https://security.gentoo.org/glsa/201705-10
Tags : vendor-advisory, x_refsource_GENTOO
http://www.openwall.com/lists/oss-security/2016/12/01/2
Tags : mailing-list, x_refsource_MLIST