CVE-2015-7560

samba: Incorrect ACL get/set allowed on symlink path

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The SMB1 implementation in smbd in Samba 3.x and 4.x before 4.1.23, 4.2.x before 4.2.9, 4.3.x before 4.3.6, and 4.4.x before 4.4.0rc4 allows remote authenticated users to modify arbitrary ACLs by using a UNIX SMB1 call to create a symlink, and then using a non-UNIX SMB1 call to write to the ACL content.

La implementación de SMB1 en smbd en Samba 3.x y 4.x en versiones anteriores a 4.1.23, 4.2.x en versiones anteriores a 4.2.9, 4.3.x en versiones anteriores a 4.3.6 y 4.4.x en versiones anteriores a 4.4.0rc4 permite a usuarios remotos autenticados modificar ACLs arbitrarias utilizando una llamada UNIX SMB1 para crear un enlace simbólico, y después usar una llamada no-UNIX SMB1 para escribir en el contenido de la ACL.

A flaw was found in the way Samba handled ACLs on symbolic links. An authenticated user could use this flaw to gain access to an arbitrary file or directory by overwriting its ACL.

Jeremy Allison discovered that Samba incorrectly handled ACLs on symlink paths. A remote attacker could use this issue to overwrite the ownership of ACLs using symlinks. Garming Sam and Douglas Bagnall discovered that the Samba internal DNS server incorrectly handled certain DNS TXT records. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly obtain uninitialized memory contents. This issue only applied to Ubuntu 14.04 LTS and Ubuntu 15.10. Various other issues were also addressed.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

Partial

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-09-29 CVE Reserved
2016-03-08 CVE Published
2024-08-06 CVE Updated
2025-04-03 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-284: Improper Access Control

CAPEC

References (21)

URL	Tag	Source
http://www.securityfocus.com/bid/84267	Third Party Advisory
http://www.securitytracker.com/id/1035220	Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05121842	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178730.html	2022-08-29
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178764.html	2022-08-29
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/180000.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00063.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00064.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00065.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00081.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00090.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00092.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html	2022-08-29
http://www.debian.org/security/2016/dsa-3514	2022-08-29
http://www.ubuntu.com/usn/USN-2922-1	2022-08-29
https://bugzilla.samba.org/show_bug.cgi?id=11648	2022-08-29
https://www.samba.org/samba/security/CVE-2015-7560.html	2022-08-29
https://access.redhat.com/security/cve/CVE-2015-7560	2016-03-15
https://bugzilla.redhat.com/show_bug.cgi?id=1309992	2016-03-15

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"				>= 3.2.0 < 4.1.23 Search vendor "Samba" for product "Samba" and version " >= 3.2.0 < 4.1.23"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.2.0 < 4.2.9 Search vendor "Samba" for product "Samba" and version " >= 4.2.0 < 4.2.9"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.3.0 < 4.3.6 Search vendor "Samba" for product "Samba" and version " >= 4.3.0 < 4.3.6"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.4.0 Search vendor "Samba" for product "Samba" and version "4.4.0"		rc1		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.4.0 Search vendor "Samba" for product "Samba" and version "4.4.0"		rc2		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				4.4.0 Search vendor "Samba" for product "Samba" and version "4.4.0"		rc3		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		-		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
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				15.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "15.10"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				7.0 Search vendor "Debian" for product "Debian Linux" 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