Security Bulletin
Summary
IBM customers who use the IBM 4769 Developer's Toolkit to create custom firmware images may be affected by one or more vulnerabilities that were announced against the Linux kernel.
Vulnerability Details
CVEID: CVE-2019-20811
DESCRIPTION: Linux Kernel could provide weaker than expected security, caused by mishandling of reference count in the rx_queue_add_kobject() and netdev_queue_add_kobject() in net/core/net-sysfs.c. A local attacker could exploit this vulnerability to launch further attacks on the system.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/183253 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
CVEID: CVE-2020-0466
DESCRIPTION: Google Android could allow a local attacker to gain elevated privileges on the system, caused by a logic error in do_epoll_ctl and ep_loop_check_proc of eventpoll.c. By executing a specially-crafted program, an attacker could exploit this vulnerability to escalate privileges.
CVSS Base score: 8.4
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/193397 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2021-0920
DESCRIPTION: Google Android could allow a local attacker to gain elevated privileges on the system, caused by a use after free flaw due to a race condition in unix_scm_to_skb of af_unix.c. By executing a specially-crafted program, an attacker could exploit this vulnerability to escalate privileges.
CVSS Base score: 7.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215673 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVEID: CVE-2021-3347
DESCRIPTION: Linux Kernel could allow a local authenticated attacker to gain elevated privileges on the system, caused by a kernel stack use-after-free during fault handling in PI futexes. An attacker could exploit this vulnerability to gain elevated privileges and execute arbitrary code in the kernel.
CVSS Base score: 7.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/195798 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2018-19985
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an out-of-bounds read in the hso_get_config_data function in drivers/net/usb/hso.c. A local attacker could exploit this vulnerability to cause the system to crash.
CVSS Base score: 4.6
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/160204 for the current score.
CVSS Vector: (CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2018-20169
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by improper size validation by the __usb_get_extra_descriptor function in drivers/usb/core/usb.c in the USB subsystem. By sending a specially-crafted request, a local attacker could exploit this vulnerability to cause a denial of service condition.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/154367 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2019-13648
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a flaw in arch/powerpc/kernel/signal_32.c and arch/powerpc/kernel/signal_64.c when hardware transactional memory is disabled. By using a sigreturn() system call with crafted signal frame, a local attacker could exploit this vulnerability to cause the system to crash.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/164506 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2019-15916
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a memory leak in register_queue_kobjects() in net/core/net-sysfs.c. A local attacker could exploit this vulnerability to cause the system to crash.
CVSS Base score: 4
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/166559 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2019-19527
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a use-after-free condition in drivers/hid/usbhid/hiddev.c. By connecting a specially-crafted USB device, an attacker could exploit this vulnerability to cause a kernel panic.
CVSS Base score: 4.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/172524 for the current score.
CVSS Vector: (CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM 4769 Developer's Toolkit | 7.0.0 - 7.3.43 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerability by upgrading to the latest toolkit
| Product | Fixed Version |
| IBM 4769 Developer's Toolkit | 7.3.44 or later |
Customers should contact their toolkit provider to obtain the latest toolkit.
Notes:
The Linux kernel resides within segment-2 on an IBM 4769 Cryptographic Adapter so toolkit customers will need to apply the "seg2" CLU file provided with the updated toolkit.
Workarounds and Mitigations
IBM recommends that all toolkit customers upgrade to the latest version of the toolkit.
However, since the listed vulnerabilities affect specific subsystems and APIs within the Linux kernel (please refer to the individual CVEs for details), firmware that does not interact with those subsystems would be unaffected by the listed CVEs. For example, custom firmware that does not enable the IBM 4769's USB port would be unaffected by CVE-2018-19985, CVE-2018-20169 and CVE-2019-19527. Likewise, custom firmware that does not make use of "Fast Userspace Mutexes" via the futex() system call would be unaffected by CVE-2021-3347. Therefore, toolkit customers may wish to examine their custom firmware code to decide whether they might be affected by the listed CVEs.
Get Notified about Future Security Bulletins
References
Change History
05 Apr 2023: Initial Publication
*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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
05 April 2023
Initial Publish date:
05 April 2023
UID
ibm16981227