CVE-2021-47475
Linux kernel comedi USB Transfer Buffer Overflow
Description
In the Linux kernel, the following vulnerability has been resolved: comedi: vmk80xx: fix transfer-buffer overflows The driver uses endpoint-sized USB transfer buffers but up until recently had no sanity checks on the sizes. Commit e1f13c879a7c ("staging: comedi: check validity of wMaxPacketSize of usb endpoints found") inadvertently fixed NULL-pointer dereferences when accessing the transfer buffers in case a malicious device has a zero wMaxPacketSize. Make sure to allocate buffers large enough to handle also the other accesses that are done without a size check (e.g. byte 18 in vmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond the buffers, for example, when doing descriptor fuzzing. The original driver was for a low-speed device with 8-byte buffers. Support was later added for a device that uses bulk transfers and is presumably a full-speed device with a maximum 64-byte wMaxPacketSize.
INFO
Published Date :
May 22, 2024, 9:15 a.m.
Last Modified :
Nov. 21, 2024, 6:36 a.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47475.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47475 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47475 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50 Added Reference https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9 Added Reference https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47 Added Reference https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00 Added Reference https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 Added Reference https://git.kernel.org/stable/c/5229159f1d052821007aff1a1beb7873eacf1a9f Added Reference https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088 Added Reference https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1 Added Reference https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 22, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: comedi: vmk80xx: fix transfer-buffer overflows The driver uses endpoint-sized USB transfer buffers but up until recently had no sanity checks on the sizes. Commit e1f13c879a7c ("staging: comedi: check validity of wMaxPacketSize of usb endpoints found") inadvertently fixed NULL-pointer dereferences when accessing the transfer buffers in case a malicious device has a zero wMaxPacketSize. Make sure to allocate buffers large enough to handle also the other accesses that are done without a size check (e.g. byte 18 in vmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond the buffers, for example, when doing descriptor fuzzing. The original driver was for a low-speed device with 8-byte buffers. Support was later added for a device that uses bulk transfers and is presumably a full-speed device with a maximum 64-byte wMaxPacketSize. Added Reference kernel.org https://git.kernel.org/stable/c/5229159f1d052821007aff1a1beb7873eacf1a9f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47475 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47475
weaknesses.