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             AUSCERT External Security Bulletin Redistribution

    Security Bulletin: Multiple vulnerabilities in OpenSSL affect IBM i
                             20 December 2019


        AusCERT Security Bulletin Summary

Product:           OpenSSL
Publisher:         IBM
Operating System:  IBM i
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1563 CVE-2019-1549 CVE-2019-1547

Reference:         ESB-2019.4657

Original Bulletin: 

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Multiple vulnerabilities in OpenSSL affect IBM i

Security Bulletin


OpenSSL is used by IBM i. IBM i has addressed the applicable CVEs.

Vulnerability Details

CVEID: CVE-2019-1547
DESCRIPTION: Normally in OpenSSL EC groups always have a co-factor present and
this is used in side channel resistant code paths. However, in some cases, it
is possible to construct a group using explicit parameters (instead of using a
named curve). In those cases it is possible that such a group does not have the
cofactor present. This can occur even where all the parameters match a known
named curve. If such a curve is used then OpenSSL falls back to non-side
channel resistant code paths which may result in full key recovery during an
ECDSA signature operation. In order to be vulnerable an attacker would have to
have the ability to time the creation of a large number of signatures where
explicit parameters with no co-factor present are in use by an application
using libcrypto. For the avoidance of doubt libssl is not vulnerable because
explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected
1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in
OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).
CVSS Base score: 5.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
167020 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)

CVEID: CVE-2019-1549
DESCRIPTION: OpenSSL 1.1.1 introduced a rewritten random number generator
(RNG). This was intended to include protection in the event of a fork() system
call in order to ensure that the parent and child processes did not share the
same RNG state. However this protection was not being used in the default case.
A partial mitigation for this issue is that the output from a high precision
timer is mixed into the RNG state so the likelihood of a parent and child
process sharing state is significantly reduced. If an application already calls
OPENSSL_init_crypto() explicitly using OPENSSL_INIT_ATFORK then this problem
does not occur at all. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c).
CVSS Base score: 3.7
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
167021 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)

CVEID: CVE-2019-1563
DESCRIPTION: In situations where an attacker receives automated notification of
the success or failure of a decryption attempt an attacker, after sending a
very large number of messages to be decrypted, can recover a CMS/PKCS7
transported encryption key or decrypt any RSA encrypted message that was
encrypted with the public RSA key, using a Bleichenbacher padding oracle
attack. Applications are not affected if they use a certificate together with
the private RSA key to the CMS_decrypt or PKCS7_decrypt functions to select the
correct recipient info to decrypt. Fixed in OpenSSL 1.1.1d (Affected
1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in
OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).
CVSS Base score: 3.7
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
167022 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)

Affected Products and Versions

|Affected Product(s) |Version(s)|
|IBM i               |7.4       |
|IBM i               |7.3       |
|IBM i               |7.2       |
|IBM i               |7.1       |


The issues can be fixed by applying a PTF to IBM i. Releases 7.4 7.3, 7.2 and
7.1 of IBM i are supported and will be fixed.

The IBM i PTF numbers are:
Release 7.1 - SI71745
Release 7.2, 7.3 & 7.4 - SI71746

Important note: IBM recommends that all users running unsupported versions of
affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations


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