Multiple vulnerabilities in OpenSSL affect AIX

IBM SECURITY ADVISORY

First Issued: Tue Jan 24 09:22:21 CST 2023

The most recent version of this document is available here:

https://aix.software.ibm.com/aix/efixes/security/openssl_advisory37.asc

Security Bulletin: Multiple vulnerabilities in OpenSSL affect AIX

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SUMMARY:

Vulnerabilities in OpenSSL could allow a remote attacker to cause a buffer
overflow (CVE-2022-3602), cause a denial of service (CVE-2022-3786), or
obtain sensitive information (CVE-2022-3358). OpenSSL is used by AIX as
part of AIX's secure network communications.

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VULNERABILITY DETAILS:

CVEID: CVE-2022-3602
    https://vulners.com/cve/CVE-2022-3602
    https://vulners.com/cve/CVE-2022-3602
DESCRIPTION: OpenSSL is vulnerable to a stack-based buffer overflow,
    caused by improper bounds checking during X.509 certificate
    verification. By using a specially-crafted email address, a remote
    attacker could overflow a buffer and execute arbitrary code or cause
    the application to crash.
CVSS Base Score: 7.5
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/239161
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2022-3786
    https://vulners.com/cve/CVE-2022-3786
    https://vulners.com/cve/CVE-2022-3786
DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by a
    stack based buffer overflow during X.509 certificate verification.
    By using a specially-crafted email address in a certificate, a remote
    attacker could exploit this vulnerability to cause a TLS client to
    crash, and results in a denial of service condition.
CVSS Base Score: 7.5
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/239165
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2022-3358
    https://vulners.com/cve/CVE-2022-3358
    https://vulners.com/cve/CVE-2022-3358
DESCRIPTION: OpenSSL could allow a remote attacker to obtain sensitive
    information, caused by the improper handling of legacy custom ciphers
    passed to the EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() and
    EVP_CipherInit_ex2() functions. By creating a custom cipher with
    NID_undef using the legacy EVP_CIPHER_meth_new()function, a remote
    attacker could exploit this vulnerability force the use of a NULL
    cipher and emit the plaintext as the ciphertext.
CVSS Base Score: 5.3
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/238264
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)


AFFECTED PRODUCTS AND VERSIONS:

    AIX 7.3 TL1

    The following fileset levels are vulnerable:
    
    key_fileset = osrcaix

    Fileset          Lower Level   Upper Level    KEY
    ------------------------------------------------------
    openssl.base     3.0.5.101     3.0.5.101      key_w_fs

    Note:
    A. 0.9.8, 1.0.1 OpenSSL versions are out-of-support. Support for
        OpenSSL 1.0.2 version ends by December 2023. Customers are
        advised to upgrade to OpenSSL 1.1.1 or 3.0 version.

    B. Latest level of OpenSSL fileset is available from the web download site:
https://www-01.ibm.com/marketing/iwm/iwm/web/pickUrxNew.do?source=aixbp&S_PKG=openssl

    To find out whether the affected filesets are installed on your systems,
    refer to the lslpp command found in the AIX user's guide.

    Example:  lslpp -L | grep -i openssl.base

REMEDIATION:

    FIXES

        IBM strongly recommends addressing the vulnerability now.

        A fix is available, and it can be downloaded from:

https://www-01.ibm.com/marketing/iwm/iwm/web/pickUrxNew.do?source=aixbp&S_PKG=openssl

        To extract the fixes from the tar file:

        zcat openssl-3.0.7.1000.tar.Z | tar xvf -


        IMPORTANT: If possible, it is recommended that a mksysb backup
        of the system be created.  Verify it is both bootable and
        readable before proceeding.

        Note that all the previously reported security vulnerability fixes
        are also included in above mentioned fileset level. Please refer to 
        the readme file (provided along with the fileset) for the complete
        list of vulnerabilities fixed.

        To preview the fix installation:

        installp -apYd . openssl

        To install the fix package:

        installp -aXYd . openssl
                    
        openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]

        openssl dgst -sha256 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file]

        Published advisory OpenSSL signature file location:

        https://aix.software.ibm.com/aix/efixes/security/openssl_advisory37.asc.sig


WORKAROUNDS AND MITIGATIONS:

    None.

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CONTACT US:

Note: Keywords labeled as KEY in this document are used for parsing
purposes.

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To obtain the OpenSSL public key that can be used to verify the
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    Download the key from our web page:

ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt

Please contact your local IBM AIX support center for any
assistance.

REFERENCES:

Review this information as needed, no action required.

Complete CVSS v3 Guide:
    https://www.first.org/cvss/user-guide
On-line Calculator v3:
    https://www.first.org/cvss/calculator/3.0

RELATED INFORMATION:

Security Bulletin: Multiple vulnerabilities in OpenSSL affect AIX
    https://www.ibm.com/support/pages/node/6857295

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Tue Jan 24 09:22:21 CST 2023

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*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact
of this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.

Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an “industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response.” IBM PROVIDES THE CVSS SCORES “AS IS” WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.