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CVE-2020-27618

Published: 26 February 2021

The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier, when processing invalid multi-byte input sequences in IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 encodings, fails to advance the input state, which could lead to an infinite loop in applications, resulting in a denial of service, a different vulnerability from CVE-2016-10228.

Notes

AuthorNote
sbeattie
addressing this issue likely also depends on addressing
CVE-2016-10228 which is upstream commit 91927b7c76 ("Rewrite
iconv option parsing [BZ #19519]") in older versions on glibc,
but is a pretty significant change.

Priority

Low

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
trusty Needed

upstream Needs triage

xenial Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

glibc
Launchpad, Ubuntu, Debian
groovy Ignored
(end of life)
bionic
Released (2.27-3ubuntu1.5)
xenial
Released (2.23-0ubuntu11.3+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (2.31-0ubuntu9.7)
hirsute Not vulnerable
(2.33-0ubuntu1)
impish Not vulnerable
(2.33-0ubuntu1)
jammy Not vulnerable
(2.33-0ubuntu1)
kinetic Not vulnerable
(2.33-0ubuntu1)
lunar Not vulnerable
(2.33-0ubuntu1)
trusty Does not exist

upstream
Released (2.33)
mantic Not vulnerable
(2.33-0ubuntu1)
Patches:
upstream: https://sourceware.org/git/?p=glibc.git;a=commit;h=9a99c682144bdbd40792ebf822fe9264e0376fb5

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H