Denial of service in NetBSD

1) Memory leak

EUVDB-ID: #VU5226

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local user to cause denial of service conditions.

The vulnerability exists due to an error within sys/kern/uipc_usrreq.c file when calling the connect system call on a particular file descriptor with specific arguments. A local user can repeatedly send a specially crafted connect() system call to trigger a memory leak and consume all memory resources on the target system.

Successful exploitation of this vulnerability may allow a local user to cause denial of service (DoS).

Mitigation

Install patch from vendor's website:
To update from CVS, re-build, and re-install the kernel:

	# cd src
	# cvs update -d -P -r VERSION sys/kern/uipc_usrreq.c
	# ./build.sh kernel=KERNCONF
	# mv /netbsd /netbsd.old
	# cp sys/arch/ARCH/compile/obj/KERNCONF/netbsd /netbsd
	# shutdown -r now

Vulnerable software versions

NetBSD: 6.0 - 7.0.2

External links

http:ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2017-001.txt.asc

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.