CVE-2020-10531

Name	CVE-2020-10531
Description	An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.
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-2151-1, DSA-4646-1
Debian Bugs	953747

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
icu (PTS)	jessie, jessie (lts)	52.1-8+deb8u9	fixed
	stretch (security), stretch (lts), stretch	57.1-6+deb9u5	fixed
	buster	63.1-6+deb10u3	fixed
	buster (security), buster (lts)	63.1-6+deb10u2	fixed
	bullseye	67.1-7	fixed
	bookworm	72.1-3	fixed
	sid, trixie	72.1-5	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
icu	source	experimental	66.1-2
icu	source	wheezy	(unfixed)	end-of-life
icu	source	jessie	52.1-8+deb8u8		DLA-2151-1
icu	source	stretch	57.1-6+deb9u4		DSA-4646-1
icu	source	buster	63.1-6+deb10u1		DSA-4646-1
icu	source	(unstable)	63.2-3			953747

Notes

https://bugs.chromium.org/p/chromium/issues/detail?id=1044570 (not public)
Upstream ICU bug: https://unicode-org.atlassian.net/browse/ICU-20958 (private)
Fixed by: https://github.com/unicode-org/icu/commit/b7d08bc04a4296982fcef8b6b8a354a9e4e7afca
https://github.com/unicode-org/icu/pull/971