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CVE-2019-8050 : Detail

CVE-2019-8050

9.8
/
CRITICAL
Overflow
35.37%V3
Network
2019-08-20 18:00 +00:00
2020-07-06 15:38 +00:00
CVE.org
NVD

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Descriptions

Adobe Acrobat and Reader versions 2019.012.20035 and earlier, 2019.012.20035 and earlier, 2017.011.30142 and earlier, 2017.011.30143 and earlier, 2015.006.30497 and earlier, and 2015.006.30498 and earlier have a heap overflow vulnerability. Successful exploitation could lead to arbitrary code execution .

Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-787 Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.

Metrics

Metric Score Severity CVSS Vector Source
V3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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

The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more 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 when attacking 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 of the vulnerable system to carry out an attack.

User Interaction

This metric captures the requirement for a human 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

The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope.

Scope

Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs.

Unchanged

An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.

Base: Impact Metrics

The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve.

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 a 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 a 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 in the description of a vulnerability.

Environmental Metrics

These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.

 nvd@nist.gov
V2 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P nvd@nist.gov

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 : 47272

Publication date : 2019-08-14 22:00 +00:00
Author : Google Security Research
EDB Verified : Yes

We have observed the following access violation exception in the latest version of Adobe Acrobat Reader DC for Windows, when opening a malformed PDF file: --- cut --- (36ec.3210): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=fffff987 ebx=f8519200 ecx=290cc000 edx=290c8fbc esi=28f43098 edi=fffff851 eip=645412f9 esp=1390d9e4 ebp=00000014 iopl=0 nv up ei ng nz na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010286 AGM!AGMInitialize+0x584c9: 645412f9 8911 mov dword ptr [ecx],edx ds:002b:290cc000=???????? 0:023> !heap -p -a ecx-8 address 290cbff8 found in _DPH_HEAP_ROOT @ bc51000 in busy allocation ( DPH_HEAP_BLOCK: UserAddr UserSize - VirtAddr VirtSize) bc53d9c: 28c10090 4bbf70 - 28c10000 4bd000 66d6a8d0 verifier!AVrfDebugPageHeapAllocate+0x00000240 77304b26 ntdll!RtlDebugAllocateHeap+0x0000003c 7725e3e6 ntdll!RtlpAllocateHeap+0x000000f6 7725cfb7 ntdll!RtlpAllocateHeapInternal+0x000002b7 7725ccee ntdll!RtlAllocateHeap+0x0000003e 66e5aa2f vrfcore!VfCoreRtlAllocateHeap+0x0000001f 74a2f1f6 ucrtbase!_malloc_base+0x00000026 0e75fcd9 AcroRd32!AcroWinMainSandbox+0x00003ed9 64531c72 AGM!AGMInitialize+0x00048e42 0:023> kb # ChildEBP RetAddr Args to Child WARNING: Stack unwind information not available. Following frames may be wrong. 00 1390da28 77240a31 07bb5958 64540190 1390daac AGM!AGMInitialize+0x584c9 01 1390da9c 74a2f1f6 f238e0c0 07bb5958 0dc0fc40 ntdll!RtlCaptureStackBackTrace+0x41 02 1390dab8 0e75fcd9 004bbf70 0e75fcc0 6451f0bd ucrtbase!_malloc_base+0x26 03 1390db54 6451e588 12b91f98 0000047b 00000001 AcroRd32!AcroWinMainSandbox+0x3ed9 04 1390db58 12b91f98 0000047b 00000001 00000000 AGM!AGMInitialize+0x35758 05 1390db5c 00000000 00000001 00000000 17191e14 0x12b91f98 --- cut --- Notes: - Reproduces on Adobe Acrobat Reader DC (2019.012.20035) on Windows 10, with and without PageHeap enabled. Without PageHeap, the crash may also be triggered in ntdll!RtlReportCriticalFailure, if the system allocator detects a corrupted chunk. - The crash is caused by a heap-based buffer overflow and occurs immediately after opening the PDF document (poc1.pdf), or with a bit of interaction (scrolling to other pages, zooming in and out) for poc2.pdf and poc3.pdf. - We classify the bug as a potential RCE. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/47272.zip

Products Mentioned

Configuraton 0

Adobe>>Acrobat_dc >> Version From (including) 15.006.30060 To (excluding) 15.006.30499

Adobe>>Acrobat_dc >> Version From (including) 15.008.20082 To (excluding) 19.012.20036

Adobe>>Acrobat_dc >> Version From (including) 17.011.30059 To (excluding) 17.011.30144

Adobe>>Acrobat_reader_dc >> Version From (including) 15.006.30060 To (excluding) 15.006.30499

Adobe>>Acrobat_reader_dc >> Version From (including) 15.008.20082 To (excluding) 19.012.20036

Adobe>>Acrobat_reader_dc >> Version From (including) 17.011.30059 To (excluding) 17.011.30144

Apple>>Macos >> Version -

Microsoft>>Windows >> Version -

References


More information
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