Vulnerabilities > CVE-2018-4243 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Apple products
Attack vector
NETWORK Attack complexity
MEDIUM Privileges required
NONE Confidentiality impact
COMPLETE Integrity impact
COMPLETE Availability impact
COMPLETE Summary
An issue was discovered in certain Apple products. iOS before 11.4 is affected. macOS before 10.13.5 is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 is affected. The issue involves the "Kernel" component. A buffer overflow in getvolattrlist allows attackers to execute arbitrary code in a privileged context 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.
Exploit-Db
| description | Apple macOS/iOS Kernel - Heap Overflow Due to Lack of Lower Size Check in getvolattrlist. CVE-2018-4243. Dos exploit for Multiple platform. Tags: Heap Overflow |
| file | exploits/multiple/dos/44848.c |
| id | EDB-ID:44848 |
| last seen | 2018-06-07 |
| modified | 2018-06-06 |
| platform | multiple |
| port | |
| published | 2018-06-06 |
| reporter | Exploit-DB |
| source | https://www.exploit-db.com/download/44848/ |
| title | Apple macOS/iOS Kernel - Heap Overflow Due to Lack of Lower Size Check in getvolattrlist |
| type | dos |
Nessus
NASL family Misc. NASL id APPLETV_11_4.NASL description According to its banner, the version of Apple TV on the remote device is prior to 11.4. It is, therefore, affected by multiple vulnerabilities as described in the HT208850 security advisory. Note that only 4th and 5th generation models are affected by these vulnerabilities. last seen 2020-06-01 modified 2020-06-02 plugin id 110325 published 2018-06-05 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/110325 title Apple TV < 11.4 Multiple Vulnerabilities code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(110325); script_version("1.6"); script_cvs_date("Date: 2019/04/05 23:25:06"); script_cve_id( "CVE-2018-4188", "CVE-2018-4190", "CVE-2018-4192", "CVE-2018-4198", "CVE-2018-4199", "CVE-2018-4200", "CVE-2018-4201", "CVE-2018-4204", "CVE-2018-4206", "CVE-2018-4211", "CVE-2018-4214", "CVE-2018-4218", "CVE-2018-4222", "CVE-2018-4223", "CVE-2018-4224", "CVE-2018-4232", "CVE-2018-4233", "CVE-2018-4235", "CVE-2018-4237", "CVE-2018-4240", "CVE-2018-4241", "CVE-2018-4243", "CVE-2018-4246", "CVE-2018-4249", "CVE-2018-5383" ); script_bugtraq_id( 103957, 103958, 103961, 104378 ); script_xref(name:"APPLE-SA", value:"APPLE-SA-2018-6-01-6"); script_name(english:"Apple TV < 11.4 Multiple Vulnerabilities"); script_summary(english:"Checks the build number."); script_set_attribute(attribute:"synopsis", value: "The remote Apple TV device is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "According to its banner, the version of Apple TV on the remote device is prior to 11.4. It is, therefore, affected by multiple vulnerabilities as described in the HT208850 security advisory. Note that only 4th and 5th generation models are affected by these vulnerabilities."); script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT208850"); # https://lists.apple.com/archives/security-announce/2018/Jun/msg00003.html script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0e8b8fb7"); # https://lists.apple.com/archives/security-announce/2018/Jul/msg00011.html script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b0bb7d4f"); script_set_attribute(attribute:"solution", value: "Upgrade to Apple TV version 11.4 or later. Note that this update is only available for 4th and 5th generation models."); script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-4241"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"exploited_by_malware", value:"true"); script_set_attribute(attribute:"metasploit_name", value:'Mac OS X libxpc MITM Privilege Escalation'); script_set_attribute(attribute:"exploit_framework_metasploit", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2018/06/01"); script_set_attribute(attribute:"patch_publication_date", value:"2018/06/01"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/06/05"); script_set_attribute(attribute:"plugin_type", value:"remote"); script_set_attribute(attribute:"cpe", value:"cpe:/a:apple:apple_tv"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Misc."); script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("appletv_version.nasl"); script_require_keys("AppleTV/Version", "AppleTV/Model", "AppleTV/URL", "AppleTV/Port"); script_require_ports("Services/www", 7000); exit(0); } include("audit.inc"); include("appletv_func.inc"); url = get_kb_item('AppleTV/URL'); if (empty_or_null(url)) exit(0, 'Cannot determine Apple TV URL.'); port = get_kb_item('AppleTV/Port'); if (empty_or_null(port)) exit(0, 'Cannot determine Apple TV port.'); build = get_kb_item('AppleTV/Version'); if (empty_or_null(build)) audit(AUDIT_UNKNOWN_DEVICE_VER, 'Apple TV'); model = get_kb_item('AppleTV/Model'); if (empty_or_null(model)) exit(0, 'Cannot determine Apple TV model.'); # https://en.wikipedia.org/wiki/TvOS # 4th gen model "5,3" and 5th gen model "6,2" share same build fixed_build = "15L577"; tvos_ver = '11'; # determine gen from the model gen = APPLETV_MODEL_GEN[model]; appletv_check_version( build : build, fix : fixed_build, affected_gen : make_list(4, 5), fix_tvos_ver : tvos_ver, model : model, gen : gen, port : port, url : url, severity : SECURITY_HOLE );NASL family MacOS X Local Security Checks NASL id MACOS_10_13_5.NASL description The remote host is running a version of macOS / Mac OS X that is 10.13.x prior to 10.13.5. It is, therefore, affected by multiple vulnerabilities. Note that successful exploitation of the most serious issues can result in arbitrary code execution. last seen 2020-06-01 modified 2020-06-02 plugin id 110324 published 2018-06-05 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/110324 title macOS 10.13.x < 10.13.5 Multiple Vulnerabilities code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(110324); script_version("1.11"); script_cvs_date("Date: 2019/11/04"); script_cve_id( "CVE-2018-4141", "CVE-2018-4159", "CVE-2018-4180", "CVE-2018-4181", "CVE-2018-4182", "CVE-2018-4183", "CVE-2018-4184", "CVE-2018-4193", "CVE-2018-4194", "CVE-2018-4196", "CVE-2018-4198", "CVE-2018-4202", "CVE-2018-4211", "CVE-2018-4217", "CVE-2018-4219", "CVE-2018-4221", "CVE-2018-4223", "CVE-2018-4224", "CVE-2018-4225", "CVE-2018-4226", "CVE-2018-4227", "CVE-2018-4228", "CVE-2018-4229", "CVE-2018-4230", "CVE-2018-4234", "CVE-2018-4235", "CVE-2018-4236", "CVE-2018-4237", "CVE-2018-4240", "CVE-2018-4241", "CVE-2018-4242", "CVE-2018-4243", "CVE-2018-4249", "CVE-2018-4251", "CVE-2018-4253", "CVE-2018-4254", "CVE-2018-4255", "CVE-2018-4256", "CVE-2018-4257", "CVE-2018-4258", "CVE-2018-4404", "CVE-2018-4478", "CVE-2018-5383", "CVE-2018-7584" ); script_bugtraq_id( 103204, 104378, 104879, 104888, 104889, 104897, 107135 ); script_xref(name:"APPLE-SA", value:"APPLE-SA-2018-7-23-2"); script_name(english:"macOS 10.13.x < 10.13.5 Multiple Vulnerabilities"); script_summary(english:"Checks the version of Mac OS X / macOS."); script_set_attribute(attribute:"synopsis", value: "The remote host is missing a macOS update that fixes multiple security vulnerabilities."); script_set_attribute(attribute:"description", value: "The remote host is running a version of macOS / Mac OS X that is 10.13.x prior to 10.13.5. It is, therefore, affected by multiple vulnerabilities. Note that successful exploitation of the most serious issues can result in arbitrary code execution."); script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT208849"); # https://lists.apple.com/archives/security-announce/2018/Jul/msg00009.html script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?68a789b4"); script_set_attribute(attribute:"solution", value: "Upgrade to macOS version 10.13.5 or later."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-4258"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"exploited_by_malware", value:"true"); script_set_attribute(attribute:"metasploit_name", value:'Safari Proxy Object Type Confusion'); script_set_attribute(attribute:"exploit_framework_metasploit", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2018/06/01"); script_set_attribute(attribute:"patch_publication_date", value:"2018/06/01"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/06/05"); script_set_attribute(attribute:"plugin_type", value:"combined"); script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x"); script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:macos"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"MacOS X Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl", "os_fingerprint.nasl"); script_require_ports("Host/MacOSX/Version", "Host/OS"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("misc_func.inc"); os = get_kb_item("Host/MacOSX/Version"); if (!os) { os = get_kb_item_or_exit("Host/OS"); if ("Mac OS X" >!< os) audit(AUDIT_OS_NOT, "macOS / Mac OS X"); c = get_kb_item("Host/OS/Confidence"); if (c <= 70) exit(1, "Can't determine the host's OS with sufficient confidence."); } if (!os) audit(AUDIT_OS_NOT, "macOS / Mac OS X"); matches = pregmatch(pattern:"Mac OS X ([0-9]+(\.[0-9]+)+)", string:os); if (empty_or_null(matches)) exit(1, "Failed to parse the macOS / Mac OS X version ('" + os + "')."); version = matches[1]; fix = "10.13.5"; if (version !~"^10\.13($|[^0-9])") audit(AUDIT_OS_NOT, "macOS 10.13.x"); if (ver_compare(ver:version, fix:fix, strict:FALSE) == -1) { security_report_v4( port:0, severity:SECURITY_HOLE, extra: '\n Installed version : ' + version + '\n Fixed version : ' + fix + '\n' ); } else audit(AUDIT_INST_VER_NOT_VULN, "macOS / Mac OS X", version);
Seebug
| bulletinFamily | exploit |
| description | getvolattrlist takes a user controlled bufferSize argument via the fgetattrlist syscall. When allocating a kernel buffer to serialize the attr list to there's the following comment: ``` /* * Allocate a target buffer for attribute results. * Note that since we won't ever copy out more than the caller requested, * we never need to allocate more than they offer. */ ab.allocated = ulmin(bufferSize, fixedsize + varsize); if (ab.allocated > ATTR_MAX_BUFFER) { error = ENOMEM; VFS_DEBUG(ctx, vp, "ATTRLIST - ERROR: buffer size too large (%d limit %d)", ab.allocated, ATTR_MAX_BUFFER); goto out; } MALLOC(ab.base, char *, ab.allocated, M_TEMP, M_ZERO | M_WAITOK); ``` The problem is that the code doesn't then correctly handle the case when the user supplied buffer size is smaller that the requested header size. If we pass ATTR_CMN_RETURNED_ATTRS we'll hit the following code: ``` /* Return attribute set output if requested. */ if (return_valid) { ab.actual.commonattr |= ATTR_CMN_RETURNED_ATTRS; if (pack_invalid) { /* Only report the attributes that are valid */ ab.actual.commonattr &= ab.valid.commonattr; ab.actual.volattr &= ab.valid.volattr; } bcopy(&ab.actual, ab.base + sizeof(uint32_t), sizeof (ab.actual)); } ``` There's no check that the allocated buffer is big enough to hold at least that. Tested on MacOS 10.13.4 (17E199) |
| id | SSV:97333 |
| last seen | 2018-06-08 |
| modified | 2018-06-08 |
| published | 2018-06-08 |
| reporter | Knownsec |
| source | https://www.seebug.org/vuldb/ssvid-97333 |
| title | MacOS/iOS kernel heap overflow due to lack of lower size check in getvolattrlist(CVE-2018-4243) |