CVE-2021-43396

NameCVE-2021-43396
Description** DISPUTED ** 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. NOTE: the vendor states "the bug cannot be invoked through user input and requires iconv to be invoked with a NULL inbuf, which ought to require a separate application bug to do so unintentionally. Hence there's no security impact to the bug."
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs998622

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
glibc (PTS)stretch2.24-11+deb9u4fixed
stretch (security)2.24-11+deb9u1fixed
buster2.28-10fixed
bullseye2.31-13+deb11u2vulnerable
bookworm, sid2.32-5fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
glibcsourcestretch(not affected)
glibcsourcebuster(not affected)
glibcsource(unstable)2.32-5unimportant998622

Notes

[buster] - glibc <not-affected> (Vulnerable code not present)
[stretch] - glibc <not-affected> (Vulnerable code not present)
https://sourceware.org/bugzilla/show_bug.cgi?id=28524
Fixed by: https://sourceware.org/git/?p=glibc.git;a=commit;h=ff012870b2c02a62598c04daa1e54632e020fd7d
Introduced by the fix for CVE-2021-3326 / BZ#27256: https://sourceware.org/git/?p=glibc.git;a=commit;h=7d88c6142c6efc160c0ee5e4f85cde382c072888
No security impact per upstream assessment

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