CyberSecBulletin
CVE-2023-52614NVD status: Modified

Linux: Buffer Copy without Checking Size of Input

Published Updated By the CyberSecBulletin desk

CVE-2023-52614 is a high-severity buffer copy without checking size of input vulnerability in Linux, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 087de000e4f8c878c81d9dd3725f00a1d292980c, 796d3fad8c35ee9df9027899fb90ceaeb41b958f, 8a7729cda2dd276d7a3994638038fb89035b6f2c as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.26% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 087de000e4f8c878c81d9dd3725f00a1d292980c or 796d3fad8c35ee9df9027899fb90ceaeb41b958f or 8a7729cda2dd276d7a3994638038fb89035b6f2c or a979f56aa4b93579cf0e4265ae04d7e9300fd3e8, whichever matches your release line, or a later version.
  2. Update SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to V1.1.1 or a later version.
  3. Update Linux Kernel to 5.10.216 or 5.15.149 or 6.1.76 or 6.6.15, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxe552bbaf5b987f57c43e6981a452b8a3c700b1ae up to, but not including, 087de000e4f8c878c81d9dd3725f00a1d292980c; e552bbaf5b987f57c43e6981a452b8a3c700b1ae up to, but not including, 796d3fad8c35ee9df9027899fb90ceaeb41b958f; e552bbaf5b987f57c43e6981a452b8a3c700b1ae up to, but not including, 8a7729cda2dd276d7a3994638038fb89035b6f2c; e552bbaf5b987f57c43e6981a452b8a3c700b1ae up to, but not including, a979f56aa4b93579cf0e4265ae04d7e9300fd3e8; e552bbaf5b987f57c43e6981a452b8a3c700b1ae up to, but not including, eaef4650fa2050147ca25fd7ee43bc0082e03c87; e552bbaf5b987f57c43e6981a452b8a3c700b1ae up to, but not including, 08e23d05fa6dc4fc13da0ccf09defdd4bbc92ff4; 3.8087de000e4f8c878c81d9dd3725f00a1d292980c, 796d3fad8c35ee9df9027899fb90ceaeb41b958f, 8a7729cda2dd276d7a3994638038fb89035b6f2c, a979f56aa4b93579cf0e4265ae04d7e9300fd3e8, eaef4650fa2050147ca25fd7ee43bc0082e03c87, 08e23d05fa6dc4fc13da0ccf09defdd4bbc92ff4
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystembefore V1.1.1V1.1.1
LinuxLinux Kernel3.8 up to, but not including, 5.10.216; 5.11 up to, but not including, 5.15.149; 5.16 up to, but not including, 6.1.76; 6.2 up to, but not including, 6.6.15; 6.7 up to, but not including, 6.7.35.10.216, 5.15.149, 6.1.76, 6.6.15, 6.7.3

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.8HighCNA
CVSS 3.17.8HighNVD

Official description

In the Linux kernel, the following vulnerability has been resolved: PM / devfreq: Fix buffer overflow in trans_stat_show Fix buffer overflow in trans_stat_show(). Convert simple snprintf to the more secure scnprintf with size of PAGE_SIZE. Add condition checking if we are exceeding PAGE_SIZE and exit early from loop. Also add at the end a warning that we exceeded PAGE_SIZE and that stats is disabled. Return -EFBIG in the case where we don't have enough space to write the full transition table. Also document in the ABI that this function can return -EFBIG error.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Buffer Copy without Checking Size of Input

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

How developers prevent this class of flaw

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer. Be wary that a language's interface to native code may still be subject to overflows, even if the language itself is theoretically safe.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Examples include the Safe C String Library (SafeStr) by Messier and Viega, and the Strsafe.h library from Microsoft. These libraries provide safer versions of overflow-prone string-handling functions.
  • Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.

More Buffer Copy without Checking Size of Input vulnerabilities (CWE-120)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Buffer Copy without Checking Size of Input vulnerabilities

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