CVE-2017-9461

samba: fd_open_atomic infinite loop due to wrong handling of dangling symlinks

Severity Score

6.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

smbd in Samba before 4.4.10 and 4.5.x before 4.5.6 has a denial of service vulnerability (fd_open_atomic infinite loop with high CPU usage and memory consumption) due to wrongly handling dangling symlinks.

smbd en Samba versiones anteriores a 4.4.10 y 4.5.x versiones anteriores a 4.5.6, tienen una vulnerabilidad de denegación de servicio (fd_open_atomic infinite loop con un alto uso de CPU y consumo de memoria) debido a un manejo inadecuado de los enlaces simbólicos colgantes.

A flaw was found in the way Samba handled dangling symlinks. An authenticated malicious Samba client could use this flaw to cause the smbd daemon to enter an infinite loop and use an excessive amount of CPU and memory.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-06-06 CVE Reserved
2017-06-06 CVE Published
2024-08-05 CVE Updated
2024-08-05 First Exploit
2024-11-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (10)

URL	Tag	Source
http://www.securityfocus.com/bid/99455	Third Party Advisory
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=10c3e3923022485c720f322ca4f0aca5d7501310	X_refsource_confirm
https://lists.debian.org/debian-lts-announce/2019/04/msg00013.html	Mailing List

URL	Date	SRC
https://bugs.debian.org/864291	2024-08-05
https://bugzilla.samba.org/show_bug.cgi?id=12572	2024-08-05

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2017:1950	2023-11-07
https://access.redhat.com/errata/RHSA-2017:2338	2023-11-07
https://access.redhat.com/errata/RHSA-2017:2778	2023-11-07
https://access.redhat.com/security/cve/CVE-2017-9461	2017-09-21
https://bugzilla.redhat.com/show_bug.cgi?id=1459464	2017-09-21

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				<= 4.4.9 Search vendor "Samba" for product "Samba" and version " <= 4.4.9"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.5.0 Search vendor "Samba" for product "Samba" and version "4.5.0"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.5.1 Search vendor "Samba" for product "Samba" and version "4.5.1"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.5.2 Search vendor "Samba" for product "Samba" and version "4.5.2"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.5.3 Search vendor "Samba" for product "Samba" and version "4.5.3"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.5.4 Search vendor "Samba" for product "Samba" and version "4.5.4"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.5.5 Search vendor "Samba" for product "Samba" and version "4.5.5"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Desktop Search vendor "Redhat" for product "Enterprise Linux Desktop"				7.0 Search vendor "Redhat" for product "Enterprise Linux Desktop" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Search vendor "Redhat" for product "Enterprise Linux Server"				7.0 Search vendor "Redhat" for product "Enterprise Linux Server" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Aus Search vendor "Redhat" for product "Enterprise Linux Server Aus"				7.4 Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "7.4"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Aus Search vendor "Redhat" for product "Enterprise Linux Server Aus"				7.6 Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "7.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Eus Search vendor "Redhat" for product "Enterprise Linux Server Eus"				7.4 Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.4"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Eus Search vendor "Redhat" for product "Enterprise Linux Server Eus"				7.5 Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.5"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Eus Search vendor "Redhat" for product "Enterprise Linux Server Eus"				7.6 Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Tus Search vendor "Redhat" for product "Enterprise Linux Server Tus"				7.6 Search vendor "Redhat" for product "Enterprise Linux Server Tus" and version "7.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Workstation Search vendor "Redhat" for product "Enterprise Linux Workstation"				7.0 Search vendor "Redhat" for product "Enterprise Linux Workstation" and version "7.0"		-		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