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CVE-2018-6129 : Détail

CVE-2018-6129

6.5
/
MEDIUM
Overflow
0.85%V3
Network
2019-06-27 14:13 +00:00
2019-06-27 14:13 +00:00
CVE.org
NVD

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Gestion des alertes

Descriptions

Out of bounds array access in WebRTC in Google Chrome prior to 67.0.3396.62 allowed a remote attacker to potentially perform out of bounds memory access via a crafted HTML page.

Informations

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-125 Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.

Metrics

Metric Score Sévérité CVSS Vecteur Source
V3.0 6.5 MEDIUM CVSS:3.0/AV:N/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.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

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

 [email protected]
V2 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P [email protected]

EPSS

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

EPSS Score

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.

EPSS Percentile

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.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 44863

Date de publication : 2018-06-07 22:00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

There is a missing check in VP9 frame processing that could lead to memory corruption. In the file video_coding/rtp_frame_reference_finder.cc, the function RtpFrameReferenceFinder::MissingRequiredFrameVp9 contains the following code: size_t temporal_idx = info.gof->temporal_idx[gof_idx]; ... for (size_t l = 0; l < temporal_idx; ++l) { ... auto missing_frame_it = missing_frames_for_layer_[l].lower_bound(ref_pid); missing_frames_for_layer_ is a std::array of length kMaxTemporalLayers which equals 5. Meanwhile, values in the temporal_idx array are read in rtp_format_vp9.cc in the following code: RETURN_FALSE_ON_ERROR(parser->ReadBits(&t, 3)); ... vp9->gof.temporal_idx[i] = t; Reading three bits makes the maximum size of temporal_idx 7, which can go out of bounds of the missing_frames_for_layer_ array. This issue causes a crash in Chrome. To reproduce the issue. 1) unzip the attached webrtc-from-chat.zip on a local webserver 2) fetch the webrtc source (https://webrtc.org/native-code/development/), and replace src/modules/rtp_rtcp/source/rtp_format_vp9.cc with the version attached to the code 3) build webrtc, including the examples 4) run the attached webrtcserver.py with python 3.6 or higher 5) start the peerconnection_client sample in the webrtc examples. Connect to the recommended server, and then select test2 as the peer to connect to 6) visit http://127.0.0.1/webrtc-from-chat/index.html in chrome 7) Enter any username and hit "Log in" 8) Type anything into the chat window at the bottom and hit send The attached file 'missingframe' contains the VP9 frame that causes this crash. Though the attached PoC requires user interaction, it is not necessary to exercise this issue in a browser. This issue affects any browser that supports VP9, and can be reached by loading a single webpage (though some browsers will prompt for permissions). It also affects native clients (such as mobile applications) that use webrtc and support VP9, though the user has to place or answer a video call for their client to be in the state where this issue is reachable. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/44863.zip

Products Mentioned

Configuraton 0

Google>>Chrome >> Version To (excluding) 67.0.3396.62

References

https://crbug.com/838672
Tags : x_refsource_MISC

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