SB2017050801 - Remote denial of service in rpcbind implementation

Description

This security bulletin contains information about 1 vulnerability.

1) Denial of service (CVE-ID: CVE-2017-8779)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Green

The 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.

Remediation

Install update from vendor's website.

References

• http://openwall.com/lists/oss-security/2017/05/03/12
• http://openwall.com/lists/oss-security/2017/05/04/1
• https://github.com/guidovranken/rpcbomb/
• https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/