CVE-2018-16851

Name	CVE-2018-16851
Description	Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-1607-1, DSA-4345-1, ELA-66-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
samba (PTS)	jessie, jessie (lts)	2:4.2.14+dfsg-0+deb8u16	fixed
	stretch (security)	2:4.5.16+dfsg-1+deb9u4	fixed
	stretch (lts), stretch	2:4.5.16+dfsg-1+deb9u5	fixed
	buster (security), buster, buster (lts)	2:4.9.5+dfsg-5+deb10u5	fixed
	bullseye (security), bullseye	2:4.13.13+dfsg-1~deb11u6	fixed
	bookworm (security), bookworm	2:4.17.12+dfsg-0+deb12u1	fixed
	sid, trixie	2:4.21.1+dfsg-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
samba	source	wheezy	2:3.6.6-6+deb7u18	ELA-66-1
samba	source	jessie	2:4.2.14+dfsg-0+deb8u11	DLA-1607-1
samba	source	stretch	2:4.5.12+dfsg-2+deb9u4	DSA-4345-1
samba	source	(unstable)	2:4.9.2+dfsg-2

https://www.samba.org/samba/security/CVE-2018-16851.html