openssl: CVE-2023-5678

Debian Bug report logs - #1055473
openssl: CVE-2023-5678

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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: openssl: CVE-2023-5678

Date: Mon, 06 Nov 2023 22:36:10 +0100

Source: openssl
Version: 3.0.12-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Control: found -1 3.0.11-1
Control: found -1 3.0.11-1~deb12u1
Control: found -1 3.0.11-1~deb12u2
Control: found -1 1.1.1w-0+deb11u1

Hi,

The following vulnerability was published for openssl.

CVE-2023-5678[0]:
| Issue summary: Generating excessively long X9.42 DH keys or checking
| excessively long X9.42 DH keys or parameters may be very slow.
| Impact summary: Applications that use the functions
| DH_generate_key() to generate an X9.42 DH key may experience long
| delays.  Likewise, applications that use DH_check_pub_key(),
| DH_check_pub_key_ex() or EVP_PKEY_public_check() to check an X9.42
| DH key or X9.42 DH parameters may experience long delays. Where the
| key or parameters that are being checked have been obtained from an
| untrusted source this may lead to a Denial of Service.  While
| DH_check() performs all the necessary checks (as of CVE-2023-3817),
| DH_check_pub_key() doesn't make any of these checks, and is
| therefore vulnerable for excessively large P and Q parameters.
| Likewise, while DH_generate_key() performs a check for an
| excessively large P, it doesn't check for an excessively large Q.
| An application that calls DH_generate_key() or DH_check_pub_key()
| and supplies a key or parameters obtained from an untrusted source
| could be vulnerable to a Denial of Service attack.
| DH_generate_key() and DH_check_pub_key() are also called by a number
| of other OpenSSL functions.  An application calling any of those
| other functions may similarly be affected.  The other functions
| affected by this are DH_check_pub_key_ex(), EVP_PKEY_public_check(),
| and EVP_PKEY_generate().  Also vulnerable are the OpenSSL pkey
| command line application when using the "-pubcheck" option, as well
| as the OpenSSL genpkey command line application.  The OpenSSL
| SSL/TLS implementation is not affected by this issue.  The OpenSSL
| 3.0 and 3.1 FIPS providers are not affected by this issue.


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-2023-5678
    https://www.cve.org/CVERecord?id=CVE-2023-5678
[1] https://www.openssl.org/news/secadv/20231106.txt

Regards,
Salvatore

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