CyberSecBulletin
CVE-2024-49894NVD status: Modified

Linux: Improper Validation of Array Index

Published Updated By the CyberSecBulletin desk

CVE-2024-49894 is a high-severity improper validation of array index 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 b3dfa878257a7e98830b3009ca5831a01d8f85fc, f5f6d90087131812c1e4b9d3103f400f1624396d, c130a3c09e3746c1a09ce26c20d21d449d039b1d 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 0.33% 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 b3dfa878257a7e98830b3009ca5831a01d8f85fc or f5f6d90087131812c1e4b9d3103f400f1624396d or c130a3c09e3746c1a09ce26c20d21d449d039b1d or c6979719012a90e5b8e3bc31725fbfdd0b9b2b79, 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 4.19.323 or 5.4.285 or 5.10.227 or 5.15.168, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c up to, but not including, b3dfa878257a7e98830b3009ca5831a01d8f85fc; 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c up to, but not including, f5f6d90087131812c1e4b9d3103f400f1624396d; 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c up to, but not including, c130a3c09e3746c1a09ce26c20d21d449d039b1d; 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c up to, but not including, c6979719012a90e5b8e3bc31725fbfdd0b9b2b79; 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c up to, but not including, 2495c8e272d84685403506833a664fad932e453a; 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c up to, but not including, 122e3a7a8c7bcbe3aacddd6103f67f9f36bed473; 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c up to, but not including, 2f5da549535be8ccd2ab7c9abac8562ad370b181; 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c up to, but not including, 07078fa5d589a7fbce8f81ea8acf7aa0021ab38e; and 2 more rangesb3dfa878257a7e98830b3009ca5831a01d8f85fc, f5f6d90087131812c1e4b9d3103f400f1624396d, c130a3c09e3746c1a09ce26c20d21d449d039b1d, c6979719012a90e5b8e3bc31725fbfdd0b9b2b79, 2495c8e272d84685403506833a664fad932e453a, 122e3a7a8c7bcbe3aacddd6103f67f9f36bed473
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystembefore V1.1.1V1.1.1
SiemensSimatic S7-1500 Tm Mfp Firmware1.1Not stated
DebianDebian Linux11.0Not stated
LinuxLinux Kernel4.15 up to, but not including, 4.19.323; 4.20 up to, but not including, 5.4.285; 5.5 up to, but not including, 5.10.227; 5.11 up to, but not including, 5.15.168; 5.16 up to, but not including, 6.1.113; 6.2 up to, but not including, 6.6.55; 6.7 up to, but not including, 6.10.14; 6.11 up to, but not including, 6.11.34.19.323, 5.4.285, 5.10.227, 5.15.168, 6.1.113, 6.6.55
SiemensSinec OSbefore 3.23.2

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 3.17.1HighCNA
CVSS 3.17.8HighNVD

Official description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix index out of bounds in degamma hardware format translation Fixes index out of bounds issue in `cm_helper_translate_curve_to_degamma_hw_format` function. The issue could occur when the index 'i' exceeds the number of transfer function points (TRANSFER_FUNC_POINTS). The fix adds a check to ensure 'i' is within bounds before accessing the transfer function points. If 'i' is out of bounds the function returns false to indicate an error. Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_cm_common.c:594 cm_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.red' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_cm_common.c:595 cm_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.green' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_cm_common.c:596 cm_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.blue' 1025 <= s32max

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

The underlying weakness: Improper Validation of Array Index

The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.

How developers prevent this class of flaw

  • Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, Ada allows the programmer to constrain the values of a variable and languages such as Java and Ruby will allow the programmer to handle exceptions when an out-of-bounds index is accessed.
  • Use a CPU and operating system that offers Data Execution Protection (using hardware NX or XD bits) or the equivalent techniques that simulate this feature in software, such as PaX. These techniques ensure that any instruction executed is exclusively at a memory address that is part of the code segment. For more information on these techniques see D3-PSEP (Process Segment Execution Prevention) from D3FEND.

More Improper Validation of Array Index vulnerabilities (CWE-129)

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 Improper Validation of Array Index vulnerabilities

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