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AUSCERT External Security Bulletin Redistribution
ESB-2019.3310.3
Linux kernel vulnerability CVE-2019-10639
4 November 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2019-10639
Reference: ESB-2019.3117
ESB-2019.3084
ESB-2019.3010
Original Bulletin:
https://support.f5.com/csp/article/K32804955
Revision History: November 4 2020: Vendor updated BIG-IP branch 16.x fix details
October 19 2020: Fixed version added to advisory
September 2 2019: Initial Release
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K32804955:Linux kernel vulnerability CVE-2019-10639
Security Advisory
Original Publication Date: 31 Aug, 2019
Latest Publication Date: 03 Nov, 2020
Security Advisory Description
The Linux kernel 4.x (starting from 4.1) and 5.x before 5.0.8 allows
Information Exposure (partial kernel address disclosure), leading to a KASLR
bypass. Specifically, it is possible to extract the KASLR kernel image offset
using the IP ID values the kernel produces for connection-less protocols (e.g.,
UDP and ICMP). When such traffic is sent to multiple destination IP addresses,
it is possible to obtain hash collisions (of indices to the counter array) and
thereby obtain the hashing key (via enumeration). This key contains enough bits
from a kernel address (of a static variable) so when the key is extracted (via
enumeration), the offset of the kernel image is exposed. This attack can be
carried out remotely, by the attacker forcing the target device to send UDP or
ICMP (or certain other) traffic to attacker-controlled IP addresses. Forcing a
server to send UDP traffic is trivial if the server is a DNS server. ICMP
traffic is trivial if the server answers ICMP Echo requests (ping). For client
targets, if the target visits the attacker's web page, then WebRTC or gQUIC can
be used to force UDP traffic to attacker-controlled IP addresses. NOTE: this
attack against KASLR became viable in 4.1 because IP ID generation was changed
to have a dependency on an address associated with a network namespace. (
CVE-2019-10639)
Impact
This vulnerability can result in leaking information to a remote user and
potentially defeating KASLR.
Security Advisory Status
F5 Product Development has assigned ID 818213 (BIG-IP) to this vulnerability.
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 |16.0.0 |16.0.1 | | | |
| +------+----------+----------+ | | |
| | |15.1.0 |15.1.1 | | | |
| |15.x |15.0.0 - |None | | | |
| | |15.0.1 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, |14.x |14.0.0 - |None | | | |
|APM, ASM, DNS, Edge| |14.1.2 | | | | |
|Gateway, FPS, GTM, +------+----------+----------+Low |3.7 |Kernel |
|Link Controller, |13.x |13.1.0 - |None | | | |
|PEM, | |13.1.3 | | | | |
|WebAccelerator) +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
^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.
Security Advisory Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Fixes introduced in column. If the table lists only an older version
than what you are currently running, or does not list a non-vulnerable version,
then no upgrade candidate currently exists.
Mitigation
To mitigate this vulnerability, you should restrict management access to the
BIG-IP system only over a secure network and restrict command line access for
affected systems to only trusted users. For more information, refer to K13309:
Restricting access to the Configuration utility by source IP address (11.x -
15.x) and K13092: Overview of securing access to the BIG-IP system.
Supplemental Information
o K51812227: Understanding Security Advisory versioning
o K41942608: Overview of Security Advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 15.x)
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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