CVE-2017-7645

kernel: nfsd: Incorrect handling of long RPC replies

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The NFSv2/NFSv3 server in the nfsd subsystem in the Linux kernel through 4.10.11 allows remote attackers to cause a denial of service (system crash) via a long RPC reply, related to net/sunrpc/svc.c, fs/nfsd/nfs3xdr.c, and fs/nfsd/nfsxdr.c.

El servidor NFSv2/NFSv3 en el subsistema nfsd en el Kernel de Linux hasta la versión 4.10.11 permite a atacantes remotos provocar una denegación de servicio (caída de sistema) a través de una respuesta RPC larga, relacionada con net/sunrpc/svc.c, fs/nfsd/nfs3xdr.c y fs/nfsd/nfsxdr.c.

The NFS2/3 RPC client could send long arguments to the NFS server. These encoded arguments are stored in an array of memory pages, and accessed using pointer variables. Arbitrarily long arguments could make these pointers point outside the array and cause an out-of-bounds memory access. A remote user or program could use this flaw to crash the kernel, resulting in denial of service.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-04-10 CVE Reserved
2017-04-18 CVE Published
2024-08-05 CVE Updated
2024-12-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-130: Improper Handling of Length Parameter Inconsistency

CAPEC

References (14)

URL	Tag	Source
http://www.securityfocus.com/bid/97950	Third Party Advisory
https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/torvalds/linux/commit/e6838a29ecb484c97e4efef9429643b9851fba6e	2023-01-17
https://marc.info/?l=linux-nfs&m=149218228327497&w=2	2023-01-17
https://marc.info/?l=linux-nfs&m=149247516212924&w=2	2023-01-17

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3886	2023-01-17
https://access.redhat.com/errata/RHSA-2017:1615	2023-01-17
https://access.redhat.com/errata/RHSA-2017:1616	2023-01-17
https://access.redhat.com/errata/RHSA-2017:1647	2023-01-17
https://access.redhat.com/errata/RHSA-2018:1319	2023-01-17
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e6838a29ecb484c97e4efef9429643b9851fba6e	2023-01-17
https://usn.ubuntu.com/3754-1	2023-01-17
https://access.redhat.com/security/cve/CVE-2017-7645	2018-05-08
https://bugzilla.redhat.com/show_bug.cgi?id=1443615	2018-05-08

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 3.2.89 Search vendor "Linux" for product "Linux Kernel" and version " < 3.2.89"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.3 < 3.10.107 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.3 < 3.10.107"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.11 < 3.12.74 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.11 < 3.12.74"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.13 < 3.16.44 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.13 < 3.16.44"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.17 < 3.18.52 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.17 < 3.18.52"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.19 < 4.1.40 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.19 < 4.1.40"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 4.4.66 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 4.4.66"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.5 < 4.9.26 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.5 < 4.9.26"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.10 < 4.10.14 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.10 < 4.10.14"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		esm		Affected