CVE-2018-15470

Name	CVE-2018-15470
Description	An issue was discovered in Xen through 4.11.x. The logic in oxenstored for handling writes depended on the order of evaluation of expressions making up a tuple. As indicated in section 7.7.3 "Operations on data structures" of the OCaml manual, the order of evaluation of subexpressions is not specified. In practice, different implementations behave differently. Thus, oxenstored may not enforce the configured quota-maxentity. This allows a malicious or buggy guest to write as many xenstore entries as it wishes, causing unbounded memory usage in oxenstored. This can lead to a system-wide DoS.
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-1577-1, DSA-4274-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
xen (PTS)	jessie, jessie (lts)	4.4.4lts5-0+deb8u1	fixed
	stretch (security), stretch (lts), stretch	4.8.5.final+shim4.10.4-1+deb9u12	fixed
	buster (security), buster, buster (lts)	4.11.4+107-gef32c7afa2-1	fixed
	bullseye	4.14.6-1	fixed
	bullseye (security)	4.14.5+94-ge49571868d-1	fixed
	bookworm	4.17.3+10-g091466ba55-1~deb12u1	fixed
	sid, trixie	4.17.3+36-g54dacb5c02-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
xen	source	jessie	4.4.4lts4-0+deb8u1		DLA-1577-1
xen	source	stretch	4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10		DSA-4274-1
xen	source	(unstable)	4.11.1~pre.20180911.5acdd26fdc+dfsg-2	unimportant

https://xenbits.xen.org/xsa/advisory-272.html