Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2017-8779 |
CWE-ID | CWE-400 |
Exploitation vector | Network |
Public exploit | Public exploit code for vulnerability #1 is available. |
Vulnerable software Subscribe |
ntirpc Universal components / Libraries / Libraries used by multiple products libtirpc Universal components / Libraries / Libraries used by multiple products RPCBind Universal components / Libraries / Libraries used by multiple products |
Vendor |
ntirpc linux-nfs.org |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU6435
Risk: Medium
CVSSv3.1: 8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:F/RL:O/RC:C]
CVE-ID: CVE-2017-8779
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an error in xdr_bytes() and xdr_string() functions when processing RPC data during memory allocation within rpcbind implementation. A remote unauthenticated attacker can send a specially crafted UDP request to port 111 and consume up to 4 gigabytes of memory per request.
Successful exploitation of this vulnerability may result in denial of service (DoS) conditions.
MitigationThe vulnerability affects 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.
To mitigate the issue install the appropriate patch from your OS vendor's website.
As a temporary solution, block all UDP traffic to port 111.
ntirpc: 1.4.0 - 1.4.3
libtirpc: 0.3.0 - 1.0.2
RPCBind: 0.2.3 - 0.2.4
External linkshttp://openwall.com/lists/oss-security/2017/05/03/12
http://openwall.com/lists/oss-security/2017/05/04/1
http://github.com/guidovranken/rpcbomb/
http://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.