CVE-2018-11396 : Detail

CVE-2018-11396

7.5
/
High
0.41%V3
Network
2018-05-23
11h00 +00:00
2019-10-16
09h06 +00:00
CVE.org
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CVE Descriptions

ephy-session.c in libephymain.so in GNOME Web (aka Epiphany) through 3.28.2.1 allows remote attackers to cause a denial of service (application crash) via JavaScript code that triggers access to a NULL URL, as demonstrated by a crafted window.open call.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE Other No informations.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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.

None

The vulnerable system can be exploited without interaction from any user.

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 5 AV:N/AC:L/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.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 44821

Publication date : 2018-05-31 22h00 +00:00
Author : Dhiraj Mishra
EDB Verified : No

Summary: ephy-session.c in libephymain.so in GNOME Web (aka Epiphany) through 3.28.2.1 allows remote attackers to cause a denial of service (application crash) via JavaScript code that triggers access to a NULL URL, as demonstrated by a crafted window.open call, CVE-2018-11396 was assigned to this issue. PoC: <script> win = window.open("hello world"); </script> Stack trace: ftw@ftw-box:~$ gdb epiphany (gdb) run Starting program: /usr/bin/epiphany [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". [New Thread 0x7fffe08bc700 (LWP 2279)] [New Thread 0x7fffdee51700 (LWP 2280)] [New Thread 0x7fffde650700 (LWP 2281)] [New Thread 0x7fffdcdd5700 (LWP 2282)] [New Thread 0x7fffd7fff700 (LWP 2283)] [New Thread 0x7fffd77fe700 (LWP 2284)] [New Thread 0x7fffd6ffd700 (LWP 2285)] [New Thread 0x7fffd67fc700 (LWP 2286)] [New Thread 0x7fffd5b8c700 (LWP 2287)] [New Thread 0x7fffd538b700 (LWP 2288)] [New Thread 0x7fff8f486700 (LWP 2294)] [New Thread 0x7fff8da1e700 (LWP 2304)] [New Thread 0x7fff8d21d700 (LWP 2305)] [New Thread 0x7fff8ea7f700 (LWP 2315)] [Thread 0x7fffd5b8c700 (LWP 2287) exited] [Thread 0x7fffd67fc700 (LWP 2286) exited] Thread 15 "pool" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fff8ea7f700 (LWP 2315)] 0x00007ffff7b75db7 in ?? () from /usr/lib/x86_64-linux-gnu/epiphany-browser/libephymain.so (gdb) bt #0 0x00007ffff7b75db7 in ?? () from /usr/lib/x86_64-linux-gnu/epiphany-browser/libephymain.so #1 0x00007ffff7079be6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 #2 0x00007ffff73fe7d0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007ffff73fde05 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 #4 0x00007fffefc246db in start_thread (arg=0x7fff8ea7f700) at pthread_create.c:463 #5 0x00007ffff5e4c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 (gdb)

Products Mentioned

Configuraton 0

Gnome>>Epiphany >> Version To (including) 3.28.2.1

References