Bug 2020652 (CVE-2021-43396)

Summary:	CVE-2021-43396 glibc: conversion from ISO-2022-JP-3 with iconv may emit spurious NUL character on state reset
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aoliva, arjun.is, ashankar, bdettelb, caswilli, codonell, dj, fjansen, fweimer, glibc-bugzilla, jburrell, jnakfour, jwong, kaycoth, law, mcermak, mfabian, mnewsome, pfrankli, psegedy, rth, sipoyare, vkumar, vmugicag
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 09:04:03 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2020653
Bug Blocks:	2020654, 2025838

Description Guilherme de Almeida Suckevicz 2021-11-05 14:22:10 UTC

In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset. This may affect data integrity in certain iconv() use cases.

Reference:
https://sourceware.org/bugzilla/show_bug.cgi?id=28524

Comment 1 Guilherme de Almeida Suckevicz 2021-11-05 14:22:29 UTC

Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 2020653]

Comment 4 Riccardo Schirone 2021-11-09 09:06:51 UTC

See https://sourceware.org/bugzilla/show_bug.cgi?id=28524#c4 for more details on why this is not considered a security issue.
I have requested to MITRE to reject this CVE.