glibc: CVE-2021-3326: Assertion failure in ISO-2022-JP-3 gconv module related to combining characters

Debian Bug report logs - #981198
glibc: CVE-2021-3326: Assertion failure in ISO-2022-JP-3 gconv module related to combining characters

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: glibc: Assertion failure in ISO-2022-JP-3 gconv module related to combining characters

Date: Wed, 27 Jan 2021 15:59:23 +0100

Source: glibc
Version: 2.31-9
Severity: important
Tags: security upstream
Forwarded: https://sourceware.org/bugzilla/show_bug.cgi?id=27256
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Control: found -1 2.28-10

Hi

Filling for tracking the upstream issue BZ#27256:

> Tavis Ormandy reported that when converting from ISO-2022-JP-3 to
> UTF-8, the gconv module could trigger an assertion failure in
> iconv/skeleton.c if the second wide character in a two-wide-character
> sequence cannot be written to the output buffer during character set
> conversion.
> 
> If glibc is built with assertions, this assertion failure can
> typically be triggered by applications (such as mail clients) which
> use the glibc iconv subsystem for MIME character set processing.

Regards,
Salvatore

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