CVE-2017-8779

RPCBind / libtirpc - Denial of Service

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

rpcbind through 0.2.4, LIBTIRPC through 1.0.1 and 1.0.2-rc through 1.0.2-rc3, and NTIRPC through 1.4.3 do not consider the maximum RPC data size during memory allocation for XDR strings, which allows remote attackers to cause a denial of service (memory consumption with no subsequent free) via a crafted UDP packet to port 111, aka rpcbomb.

Rpcbind versión 0.2.4, LIBTIRPC versión 1.0.1 y versiones 1.0.2-rc a 1.0.2-rc3, y NTIRPC versión 1.4.3, no consideran el tamaño máximo de datos RPC durante la asignación de memoria para cadenas XDR, lo que permite a atacantes remotos causar una denegación de servicio (consumo de memoria sin liberación) a través de un paquete UDP manipulado enviado al puerto 111, también conocido como rpcbomb.

It was found that due to the way rpcbind uses libtirpc (libntirpc), a memory leak can occur when parsing specially crafted XDR messages. An attacker sending thousands of messages to rpcbind could cause its memory usage to grow without bound, eventually causing it to be terminated by the OOM killer.

*Credits: N/A

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

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-05-04 CVE Reserved
2017-05-04 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-400: Uncontrolled Resource Consumption
CWE-770: Allocation of Resources Without Limits or Throttling

CAPEC

References (22)

URL	Tag	Source
http://www.securityfocus.com/bid/98325	Third Party Advisory
http://www.securitytracker.com/id/1038532	Vdb Entry
https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches	Third Party Advisory
https://security.netapp.com/advisory/ntap-20180109-0001	X_refsource_confirm

URL	Date	SRC
https://www.exploit-db.com/exploits/41974	2024-08-05

URL	Date	SRC
http://openwall.com/lists/oss-security/2017/05/03/12	2019-10-03
http://openwall.com/lists/oss-security/2017/05/04/1	2019-10-03
https://github.com/drbothen/GO-RPCBOMB	2019-10-03
https://github.com/guidovranken/rpcbomb	2019-10-03

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3845	2019-10-03
https://access.redhat.com/errata/RHBA-2017:1497	2019-10-03
https://access.redhat.com/errata/RHSA-2017:1262	2019-10-03
https://access.redhat.com/errata/RHSA-2017:1263	2019-10-03
https://access.redhat.com/errata/RHSA-2017:1267	2019-10-03
https://access.redhat.com/errata/RHSA-2017:1268	2019-10-03
https://access.redhat.com/errata/RHSA-2017:1395	2019-10-03
https://security.gentoo.org/glsa/201706-07	2019-10-03
https://usn.ubuntu.com/3759-1	2019-10-03
https://usn.ubuntu.com/3759-2	2019-10-03
https://access.redhat.com/security/cve/CVE-2017-8779	2017-06-06
https://bugzilla.redhat.com/show_bug.cgi?id=1448124	2017-06-06
https://access.redhat.com/solutions/3025811	2017-06-06

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Rpcbind Project Search vendor "Rpcbind Project"		Rpcbind Search vendor "Rpcbind Project" for product "Rpcbind"				<= 0.2.4 Search vendor "Rpcbind Project" for product "Rpcbind" and version " <= 0.2.4"		-		Affected
Libtirpc Project Search vendor "Libtirpc Project"		Libtirpc Search vendor "Libtirpc Project" for product "Libtirpc"				<= 1.0.1 Search vendor "Libtirpc Project" for product "Libtirpc" and version " <= 1.0.1"		-		Affected
Ntirpc Project Search vendor "Ntirpc Project"		Ntirpc Search vendor "Ntirpc Project" for product "Ntirpc"				<= 1.4.3 Search vendor "Ntirpc Project" for product "Ntirpc" and version " <= 1.4.3"		-		Affected