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AUSCERT External Security Bulletin Redistribution
ESB-2021.0636
OpenSSL Vulnerabilties
19 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IQ
BIG-IP
F5OS
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23841 CVE-2021-23840 CVE-2021-23839
Reference: ESB-2021.0616
ESB-2021.0613
ESB-2021.0597
Original Bulletin:
https://support.f5.com/csp/article/K24624116
https://support.f5.com/csp/article/K52833764
https://support.f5.com/csp/article/K61903372
Comment: This bulletin contains three (3) F5 Networks security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
K24624116: OpenSSL vulnerability CVE-2021-23840
Original Publication Date: 19 Feb, 2021
Security Advisory Description
Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow
the output length argument in some cases where the input length is close to the
maximum permissable length for an integer on the platform. In such cases the
return value from the function call will be 1 (indicating success), but the
output length value will be negative. This could cause applications to behave
incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this
issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL
versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is
out of support and no longer receiving public updates. Premium support
customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade
to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL
1.0.2y (Affected 1.0.2-1.0.2x). (CVE-2021-23840)
Impact
For products with None in the Versions known to be vulnerable column, there is
no impact.
For products with ** in the various columns, F5 is still researching the issue
and will update this article after confirming the required information. F5
Support has no additional information about this issue.
Security Advisory Status
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) box. To determine if your
release is known to be vulnerable, the components or features that are affected
by the vulnerability, and for information about releases, point releases, or
hotfixes that address the vulnerability, refer to the following table. For more
information about security advisory versioning, refer to K51812227:
Understanding security advisory versioning.
+---------------------+------+----------+----------+--------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity|score^|component |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |16.x |** |** | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |15.x |** |** | | | |
|Advanced WAF, AFM, +------+----------+----------+ | | |
|Analytics, APM, ASM, |14.x |** |** | | | |
|DDHD, DNS, FPS, GTM, +------+----------+----------+** |** |** |
|Link Controller, PEM,|13.x |** |** | | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |** |** | | | |
| +------+----------+----------+ | | |
| |11.x |** |** | | | |
+---------------------+------+----------+----------+--------+------+----------+
|BIG-IQ Centralized |7.x |** |** | | | |
|Management +------+----------+----------+** |** |** |
| |6.x |** |** | | | |
+---------------------+------+----------+----------+--------+------+----------+
|F5OS |1.x |** |** |** |** |** |
+---------------------+------+----------+----------+--------+------+----------+
|Traffix SDC |5.x |** |** |** |** |** |
+---------------------+------+----------+----------+--------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
**Confirmation of vulnerability or non-vulnerability is not presently
available. F5 is still researching the issue for the products indicated, and
will update this article with the most current information as soon as it has
been confirmed. F5 Support has no additional information on this issue.
Supplemental Information
o K41942608: Overview of AskF5 security advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
- --------------------------------------------------------------------------------
K52833764: OpenSSL vulnerability CVE-2021-23841
Original Publication Date: 19 Feb, 2021
Security Advisory Description
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to
create a unique hash value based on the issuer and serial number data contained
within an X509 certificate. However it fails to correctly handle any errors
that may occur while parsing the issuer field (which might occur if the issuer
field is maliciously constructed). This may subsequently result in a NULL
pointer deref and a crash leading to a potential denial of service attack. The
function X509_issuer_and_serial_hash() is never directly called by OpenSSL
itself so applications are only vulnerable if they use this function directly
and they use it on certificates that may have been obtained from untrusted
sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of
these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and
below are affected by this issue. However OpenSSL 1.0.2 is out of support and
no longer receiving public updates. Premium support customers of OpenSSL 1.0.2
should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in
OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected
1.0.2-1.0.2x). (CVE-2021-23841)
Impact
In the following table under Security Advisory Status in this article:
o For products with None in the Versions known to be vulnerable column, there
is no impact.
o For products with ** in their columns, F5 is still researching the issue
and will update this article after confirming the required information. F5
Support has no additional information about this issue.
Security Advisory Status
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) box. To determine if your
release is known to be vulnerable, the components or features that are affected
by the vulnerability, and for information about releases, point releases, or
hotfixes that address the vulnerability, refer to the following table. For more
information about security advisory versioning, refer to K51812227:
Understanding security advisory versioning.
+---------------------+------+----------+----------+--------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity|score^|component |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |16.x |** |** | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |15.x |** |** | | | |
|Advanced WAF, AFM, +------+----------+----------+ | | |
|Analytics, APM, ASM, |14.x |** |** | | | |
|DDHD, DNS, FPS, GTM, +------+----------+----------+** |** |** |
|Link Controller, PEM,|13.x |** |** | | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |** |** | | | |
| +------+----------+----------+ | | |
| |11.x |** |** | | | |
+---------------------+------+----------+----------+--------+------+----------+
|BIG-IQ Centralized |7.x |** |** | | | |
|Management +------+----------+----------+** |** |** |
| |6.x |** |** | | | |
+---------------------+------+----------+----------+--------+------+----------+
|F5OS |1.x |** |** |** |** |** |
+---------------------+------+----------+----------+--------+------+----------+
|Traffix SDC |5.x |** |** |** |** |** |
+---------------------+------+----------+----------+--------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
**At this time, F5 cannot confirm whether these products are vulnerable or not
vulnerable. F5 is still researching the issue for the products indicated and
will update this article with the most current information as soon as F5
confirms it. F5 Support has no additional information on this issue.
Supplemental Information
o K41942608: Overview of AskF5 security advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
- --------------------------------------------------------------------------------
K61903372: OpenSSL vulnerability CVE-2021-23839
Original Publication Date: 19 Feb, 2021
Security Advisory Description
OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a
server that is configured to support both SSLv2 and more recent SSL and TLS
versions then a check is made for a version rollback attack when unpadding an
RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are
supposed to use a special form of padding. A server that supports greater than
SSLv2 is supposed to reject connection attempts from a client where this
special form of padding is present, because this indicates that a version
rollback has occurred (i.e. both client and server support greater than SSLv2,
and yet this is the version that is being requested). The implementation of
this padding check inverted the logic so that the connection attempt is
accepted if the padding is present, and rejected if it is absent. This means
that such as server will accept a connection if a version rollback attack has
occurred. Further the server will erroneously reject a connection if a normal
SSLv2 connection attempt is made. Only OpenSSL 1.0.2 servers from version
1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2
server must: 1) have configured SSLv2 support at compile time (this is off by
default), 2) have configured SSLv2 support at runtime (this is off by default),
3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite
list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable
to this issue. The underlying error is in the implementation of the
RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING
padding mode used by various other functions. Although 1.1.1 does not support
SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the
RSA_SSLV23_PADDING padding mode. Applications that directly call that function
or use that padding mode will encounter this issue. However since there is no
support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a
security issue in that version. OpenSSL 1.0.2 is out of support and no longer
receiving public updates. Premium support customers of OpenSSL 1.0.2 should
upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL
1.0.2y (Affected 1.0.2s-1.0.2x). (CVE-2021-23839)
Impact
For products with None in the Versions known to be vulnerable column, there is
no impact.
For products with ** in the various columns, F5 is still researching the issue
and will update this article after confirming the required information. F5
Support has no additional information about this issue.
Security Advisory Status
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) box. To determine if your
release is known to be vulnerable, the components or features that are affected
by the vulnerability, and for information about releases, point releases, or
hotfixes that address the vulnerability, refer to the following table. For more
information about security advisory versioning, refer to K51812227:
Understanding security advisory versioning.
+---------------------+------+----------+----------+--------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity|score^|component |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |16.x |** |** | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |15.x |** |** | | | |
|Advanced WAF, AFM, +------+----------+----------+ | | |
|Analytics, APM, ASM, |14.x |** |** | | | |
|DDHD, DNS, FPS, GTM, +------+----------+----------+** |** |** |
|Link Controller, PEM,|13.x |** |** | | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |** |** | | | |
| +------+----------+----------+ | | |
| |11.x |** |** | | | |
+---------------------+------+----------+----------+--------+------+----------+
|BIG-IQ Centralized |7.x |** |** | | | |
|Management +------+----------+----------+** |** |** |
| |6.x |** |** | | | |
+---------------------+------+----------+----------+--------+------+----------+
|F5OS |1.x |** |** |** |** |** |
+---------------------+------+----------+----------+--------+------+----------+
|Traffix SDC |5.x |** |** |** |** |** |
+---------------------+------+----------+----------+--------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
**Confirmation of vulnerability or non-vulnerability is not presently
available. F5 is still researching the issue for the products indicated, and
will update this article with the most current information as soon as it has
been confirmed. F5 Support has no additional information on this issue.
Supplemental Information
o K41942608: Overview of AskF5 security advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
- --------------------------END INCLUDED TEXT--------------------
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