CVE-2016-4535 : Détail

CVE-2016-4535

7.5
/
Haute
A03-Injection
34.68%V3
Network
2016-05-05
18h00 +00:00
2024-09-16
17h34 +00:00
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Descriptions du CVE

Integer signedness error in the AV engine before DAT 8145, as used in McAfee LiveSafe 14.0, allows remote attackers to cause a denial of service (memory corruption and crash) via a crafted packed executable.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-20 Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Métriques

Métriques Score Gravité CVSS Vecteur 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

nvd@nist.gov
V2 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C 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 : 39770

Date de publication : 2016-05-03 22h00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=817 Fuzzing packed executables with McAfee's LiveSafe 14.0 on Windows found a signedness error parsing sections and relocations. The attached fuzzed testcase demonstrates this and causes a crash in mscan64a.dll. I verified that this crash reproduces on Linux and Windows, all version of McAfee appear to be affected including the embedded version and the SDK. Naturally, this code runs as SYSTEM on Windows, with no sandboxing and is used to parse untrusted remote input. 0:045> .lastevent Last event: d34.13a4: Access violation - code c0000005 (first chance) debugger time: Tue Apr 5 15:02:40.009 2016 (UTC - 7:00) 0:045> r rax=00000000306f1000 rbx=00000000306f1000 rcx=00000000ffffffff rdx=00000001031d114f rsi=00000000031d1150 rdi=00000000306f4000 rip=00000000711a36fa rsp=00000000064748a0 rbp=00000000031ca880 r8=00000000000005d3 r9=00000000306f0fff r10=8d00008661e82404 r11=0000000000000000 r12=00000000306f4000 r13=000000000647917c r14=000000001070c1b8 r15=00000000031ca698 iopl=0 nv up ei pl nz na pe nc cs=0033 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010202 mscan64a!RetrieveSingleExtensionList+0x19844a: 00000000`711a36fa 0fb64a01 movzx ecx,byte ptr [rdx+1] ds:00000001`031d1150=?? Okay, what happened there? 0:007> ub mscan64a!RetrieveSingleExtensionList+0x198437: 00000000`71fd36e7 8b45c8 mov eax,dword ptr [rbp-38h] 00000000`71fd36ea 8b08 mov ecx,dword ptr [rax] 00000000`71fd36ec 8d4101 lea eax,[rcx+1] 00000000`71fd36ef 3bc7 cmp eax,edi 00000000`71fd36f1 7332 jae mscan64a!RetrieveSingleExtensionList+0x198475 (00000000`71fd3725) 00000000`71fd36f3 2bcb sub ecx,ebx 00000000`71fd36f5 8bd1 mov edx,ecx 00000000`71fd36f7 4803d6 add rdx,rsi 0:007> dd @rbp-38 L1 00000000`0c529018 0c52d7ac 0:007> dd 0c52d7ac L1 00000000`0c52d7ac 90000fff So it looks like that calculation is used as an index into @rsi, which is obviously going to be oob. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39770.zip

Products Mentioned

Configuraton 0

Mcafee>>Livesafe >> Version 14.0

Références

https://www.exploit-db.com/exploits/39770/
Tags : exploit, x_refsource_EXPLOIT-DB