CVE-2015-8733 Détail

CVE-2015-8733

Score / Gravité

5.5

Moyen

OWSAP

A03-Injection

EPSS

0.4%V3

Vecteur

Local

Publié

2016-01-04
01h00 +00:00

Modifié

2016-12-05
13h57 +00:00

Liens officiels

CVE.org

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Descriptions du CVE

The ngsniffer_process_record function in wiretap/ngsniffer.c in the Sniffer file parser in Wireshark 1.12.x before 1.12.9 and 2.0.x before 2.0.1 does not validate the relationships between record lengths and record header lengths, which allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted file.

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	5.5	MEDIUM	CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H More informations 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. Local A vulnerability exploitable with Local access means that the vulnerable component is not bound to the network stack, and the attacker's path is via read/write/execute capabilities. In some cases, the attacker may be logged in locally in order to exploit the vulnerability, otherwise, she may rely on User Interaction to execute a malicious file. 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.

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.

EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 39076

Date de publication : 2015-12-21 23h00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

Source: https://code.google.com/p/google-security-research/issues/detail?id=658 The following crash due to a heap-based out-of-bounds read can be observed in an ASAN build of Wireshark (current git master), by feeding a malformed file to tshark ("$ ./tshark -nVxr /path/to/file"): --- cut --- ==6473==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61b00001335c at pc 0x7f391e585d1e bp 0x7ffc0ff625c0 sp 0x7ffc0ff625b8 READ of size 1 at 0x61b00001335c thread T0 #0 0x7f391e585d1d in infer_pkt_encap wireshark/wiretap/ngsniffer.c:1767:27 #1 0x7f391e582ac7 in fix_pseudo_header wireshark/wiretap/ngsniffer.c:1805:11 #2 0x7f391e57d07e in ngsniffer_process_record wireshark/wiretap/ngsniffer.c:1299:20 #3 0x7f391e576418 in ngsniffer_read wireshark/wiretap/ngsniffer.c:1034:9 #4 0x7f391e62429b in wtap_read wireshark/wiretap/wtap.c:1309:7 #5 0x51f7ea in load_cap_file wireshark/tshark.c:3479:12 #6 0x515daf in main wireshark/tshark.c:2197:13 0x61b00001335c is located 0 bytes to the right of 1500-byte region [0x61b000012d80,0x61b00001335c) allocated by thread T0 here: #0 0x4c0bc8 in malloc llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:40 #1 0x7f390a251610 in g_malloc (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4e610) #2 0x7f391e48d0e5 in wtap_open_offline wireshark/wiretap/file_access.c:1105:2 #3 0x51bd1d in cf_open wireshark/tshark.c:4195:9 #4 0x51584e in main wireshark/tshark.c:2188:9 SUMMARY: AddressSanitizer: heap-buffer-overflow wireshark/wiretap/ngsniffer.c:1767:27 in infer_pkt_encap Shadow bytes around the buggy address: 0x0c367fffa610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c367fffa620: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c367fffa630: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c367fffa640: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c367fffa650: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0c367fffa660: 00 00 00 00 00 00 00 00 00 00 00[04]fa fa fa fa 0x0c367fffa670: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c367fffa680: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c367fffa690: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c367fffa6a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c367fffa6b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==6473==ABORTING --- cut --- The crash was reported at https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11827. Attached are two files which trigger the crash. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39076.zip