Vulnerabilities > CVE-2017-2436 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Apple mac OS X
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
An issue was discovered in certain Apple products. macOS before 10.12.4 is affected. The issue involves the "IOFireWireAVC" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Nessus
| NASL family | MacOS X Local Security Checks |
| NASL id | MACOS_10_12_4.NASL |
| description | The remote host is running a version of macOS that is 10.12.x prior to 10.12.4. It is, therefore, affected by multiple vulnerabilities in multiple components, some of which are remote code execution vulnerabilities. An unauthenticated, remote attacker can exploit these remote code execution vulnerabilities by convincing a user to visit a specially crafted website, resulting in the execution of arbitrary code in the context of the current user. The affected components are as follows : - apache - apache_mod_php - AppleGraphicsPowerManagement - AppleRAID - Audio - Bluetooth - Carbon - CoreGraphics - CoreMedia - CoreText - curl - EFI - FinderKit - FontParser - HTTPProtocol - Hypervisor - iBooks - ImageIO - Intel Graphics Driver - IOATAFamily - IOFireWireAVC - IOFireWireFamily - Kernel - Keyboards - libarchive - libc++abi - LibreSSL - MCX Client - Menus - Multi-Touch - OpenSSH - OpenSSL - Printing - python - QuickTime - Security - SecurityFoundation - sudo - System Integrity Protection - tcpdump - tiffutil - WebKit |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 99134 |
| published | 2017-03-31 |
| reporter | This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. |
| source | https://www.tenable.com/plugins/nessus/99134 |
| title | macOS 10.12.x < 10.12.4 Multiple Vulnerabilities (httpoxy) |
| code | |
Seebug
| bulletinFamily | exploit |
| description | ### Technical Details The vulnerable code can be found in `IOFireWireAVC-424/IOFireWireAVC/IOFireWireAVCUserClient.cpp`: ``` [...] case kIOFWAVCUserClientCreateAsyncAVCCommand: result = CreateAVCAsyncCommand((UInt8*)arguments->structureInput, (UInt8*)arguments->structureOutput, arguments->structureInputSize, (UInt32*)&arguments->structureOutputSize); break; [...] ``` `structureInputSize` is a value that is controlled by the user passing the arguments from userspace, and it is used to determine a command length. However, the called function `CreateAVCAsyncCommand` fails to properly validate the length. ``` IOReturn IOFireWireAVCUserClient::CreateAVCAsyncCommand(UInt8 * cmd, UInt8 * asyncAVCCommandHandle, UInt32 len, UInt32 *refSize) { IOReturn res = kIOReturnNoMemory; UInt32 *pReturnedCommandHandle = (UInt32*) asyncAVCCommandHandle; UInt32 cmdLen = len - sizeof(mach_vm_address_t); // decrease len by 8 mach_vm_address_t *ppSharedBufAddress = (mach_vm_address_t*) &cmd[cmdLen]; // (a) [...] // Create the memory descriptor for the user/kernel shared response buffer pUCAsyncCommand->fMem = IOMemoryDescriptor::withAddressRange( *ppSharedBufAddress, 1024, kIODirectionInOut, fTask ) ; // (b) [...] } ``` The function will create a user/kernel shared buffer (b), with an address pointer controlled by an attacker (a). This can lead to a variety of potentially dangerous situations such as a memory read and write. |
| id | SSV:92846 |
| last seen | 2017-11-19 |
| modified | 2017-03-29 |
| published | 2017-03-29 |
| reporter | 名匿 |
| title | macOS IOFireWireAVC Kernel Extension Out of Bounds Vulnerability（CVE-2017-2436） |