glibc: CVE-2020-29562

Debian Bug report logs - #976391
glibc: CVE-2020-29562

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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: CVE-2020-29562

Date: Fri, 04 Dec 2020 15:03:58 +0100

Source: glibc
Version: 2.31-5
Severity: important
Tags: security upstream
Forwarded: https://sourceware.org/bugzilla/show_bug.cgi?id=26923
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Control: found -1 2.31-4

Hi,

The following vulnerability was published for glibc.

CVE-2020-29562[0]:
| The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to
| 2.32, when converting UCS4 text containing an irreversible character,
| fails an assertion in the code path and aborts the program,
| potentially resulting in a denial of service.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2020-29562
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29562
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=26923

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

Message #12 received at 976391@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: 976391@bugs.debian.org

Subject: Re: Bug#976391: glibc: CVE-2020-29562

Date: Fri, 4 Dec 2020 15:17:10 +0100

On Fri, Dec 04, 2020 at 03:03:58PM +0100, Salvatore Bonaccorso wrote:
> Source: glibc
> Version: 2.31-5
> Severity: important
> Tags: security upstream
> Forwarded: https://sourceware.org/bugzilla/show_bug.cgi?id=26923
> X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
> Control: found -1 2.31-4
> 
> Hi,
> 
> The following vulnerability was published for glibc.
> 
> CVE-2020-29562[0]:
> | The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to
> | 2.32, when converting UCS4 text containing an irreversible character,
> | fails an assertion in the code path and aborts the program,
> | potentially resulting in a denial of service.

The issue may be introduced due to fix for
https://sourceware.org/bugzilla/show_bug.cgi?id=18830 and so due to
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4802be92c891903caaf8cae47f685da6f26d4b9a
in 2.30 only onwards. At least the testcase does not trigger in
buster, but please double check.

Regards,
Salvatore

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