CVE-2017-8779 : rpcbind through 0.2.4, LIBTIRPC through 1.0.1 and 1.0.2-rc through 1.0.2-rc3, an

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.

Published 2017-05-04 14:29:00

Updated 2019-10-03 00:03:26

Source MITRE

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2017-8779

Rpcbind Project » Rpcbind
Versions up to, including, (<=) 0.2.4
cpe:2.3:a:rpcbind_project:rpcbind:*:*:*:*:*:*:*:*
Matching versions
Libtirpc Project » Libtirpc
Versions up to, including, (<=) 1.0.1
cpe:2.3:a:libtirpc_project:libtirpc:*:*:*:*:*:*:*:*
Matching versions
Ntirpc Project » Ntirpc
Versions up to, including, (<=) 1.4.3
cpe:2.3:a:ntirpc_project:ntirpc:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2017-8779

EPSS FAQ

82.25%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 99 %

Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2017-8779

RPC DoS targeting *nix rpcbind/libtirpc

First seen: 2020-04-26

auxiliary/dos/rpc/rpcbomb

This module exploits a vulnerability in certain versions of rpcbind, LIBTIRPC, and NTIRPC, allowing an attacker to trigger large (and never freed) memory allocations for XDR strings on the target. Authors: - guidovranken - Pearce Barry <pearce_barry@rapid7

More information

CVSS scores for CVE-2017-8779

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.8	HIGH	AV:N/AC:L/Au:N/C:N/I:N/A:C	10.0	6.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
7.5	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2017-8779

CWE-770 Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-8779

https://github.com/guidovranken/rpcbomb/

GitHub - guidovranken/rpcbomb: RPCBOMB + patches
Issue Tracking;Patch;Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1395

RHSA-2017:1395 - Security Advisory - Red Hat Customer Portal
https://access.redhat.com/errata/RHSA-2017:1263

RHSA-2017:1263 - Security Advisory - Red Hat Customer Portal
http://www.debian.org/security/2017/dsa-3845

Debian -- Security Information -- DSA-3845-1 libtirpc
https://access.redhat.com/errata/RHSA-2017:1267

RHSA-2017:1267 - Security Advisory - Red Hat Customer Portal
http://openwall.com/lists/oss-security/2017/05/03/12

oss-security - rpcbomb: remote rpcbind denial-of-service
Mailing List;Patch;Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1262

RHSA-2017:1262 - Security Advisory - Red Hat Customer Portal
http://www.securityfocus.com/bid/98325

Rpcbind CVE-2017-8779 Remote Denial of Service Vulnerability
Third Party Advisory;VDB Entry
https://usn.ubuntu.com/3759-1/

USN-3759-1: libtirpc vulnerabilities | Ubuntu security notices

CVEs referencing this url
https://www.exploit-db.com/exploits/41974/

RPCBind / libtirpc - Denial of Service
https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/

rpcbomb: remote rpcbind denial-of-service + patches – Guido Vranken
Third Party Advisory
http://openwall.com/lists/oss-security/2017/05/04/1

oss-security - Re: rpcbomb: remote rpcbind denial-of-service
Mailing List;Patch;Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1268

RHSA-2017:1268 - Security Advisory - Red Hat Customer Portal
https://security.netapp.com/advisory/ntap-20180109-0001/

CVE-2017-8779 rpcbind Vulnerability in NetApp Products | NetApp Product Security
https://github.com/drbothen/GO-RPCBOMB

GitHub - drbothen/GO-RPCBOMB: CVE-2017-8779 aka RPCBomb
Issue Tracking;Patch;Third Party Advisory
http://www.securitytracker.com/id/1038532

Rpcbind Memory Leak in rpcb_service_4() Lets Remote Users Consume Excessive Memory Resources - SecurityTracker
https://usn.ubuntu.com/3759-2/

USN-3759-2: libtirpc vulnerabilities | Ubuntu security notices

CVEs referencing this url
https://security.gentoo.org/glsa/201706-07

Libtirpc and RPCBind: Denial of Service (GLSA 201706-07) — Gentoo security
https://access.redhat.com/errata/RHBA-2017:1497

RHBA-2017:1497 - Bug Fix Advisory - Red Hat Customer Portal

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