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CVE-2023-7077NVD status: Modified

P403, P463, P553, P703, P801, X554UN, X464UN…: Improper Limitation of a Pathname to a Restricted Directory

Published Updated By the CyberSecBulletin desk

CVE-2023-7077 is a critical-severity improper limitation of a pathname to a restricted directory vulnerability in P403, P463, P553, P703, P801, X554UN, X464UN, X554UNS, X464UNV, X474HB, X464UNS, X554UNV, X555UNS, X555UNV, X754HB, X554HB, E705, E805, E905, UN551S, UN551VS, X551UHD, X651UHD, X841UHD, X981UHD, MD551C8 from Sharp Display Solutions, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected P403, P463, P553, P703, P801, X554UN, X464UN, X554UNS, X464UNV, X474HB, X464UNS, X554UNV, X555UNS, X555UNV, X754HB, X554HB, E705, E805, E905, UN551S, UN551VS, X551UHD, X651UHD, X841UHD, X981UHD, MD551C8 versions: all. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.69% chance of exploitation within 30 days, higher than 54% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of P403, P463, P553, P703, P801, X554UN, X464UN, X554UNS, X464UNV, X474HB, X464UNS, X554UNV, X555UNS, X555UNV, X754HB, X554HB, E705, E805, E905, UN551S, UN551VS, X551UHD, X651UHD, X841UHD, X981UHD, MD551C8 you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on sharp-nec-displays.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Sharp Display SolutionsP403, P463, P553, P703, P801, X554UN, X464UN, X554UNS, X464UNV, X474HB, X464UNS, X554UNV, X555UNS, X555UNV, X754HB, X554HB, E705, E805, E905, UN551S, UN551VS, X551UHD, X651UHD, X841UHD, X981UHD, MD551C8allNot stated
SharpNec E705 FirmwareNot specified in the recordNot stated
SharpNec E805 FirmwareNot specified in the recordNot stated
SharpNec E905 FirmwareNot specified in the recordNot stated
SharpNec Md551c8 FirmwareNot specified in the recordNot stated
SharpNec P403 FirmwareNot specified in the recordNot stated
SharpNec P463 FirmwareNot specified in the recordNot stated
SharpNec P553 FirmwareNot specified in the recordNot stated
SharpNec P703 FirmwareNot specified in the recordNot stated
SharpNec P801 FirmwareNot specified in the recordNot stated
SharpNec Un551s FirmwareNot specified in the recordNot stated
SharpNec Un551vs FirmwareNot specified in the recordNot stated
SharpNec X464un FirmwareNot specified in the recordNot stated
SharpNec X464uns FirmwareNot specified in the recordNot stated
SharpNec X464unv FirmwareNot specified in the recordNot stated
SharpNec X474hb FirmwareNot specified in the recordNot stated
SharpNec X551uhd FirmwareNot specified in the recordNot stated
SharpNec X554hb FirmwareNot specified in the recordNot stated
SharpNec X554un FirmwareNot specified in the recordNot stated
SharpNec X554uns FirmwareNot specified in the recordNot stated
SharpNec X554unv FirmwareNot specified in the recordNot stated
SharpNec X555uns FirmwareNot specified in the recordNot stated
SharpNec X555unv FirmwareNot specified in the recordNot stated
SharpNec X651uhd FirmwareNot specified in the recordNot stated
SharpNec X754hb FirmwareNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE; 2 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.19.8CriticalNVD
CVSS 3.19.8CriticalCISA (ADP)

Official description

Sharp NEC Displays (P403, P463, P553, P703, P801, X554UN, X464UN, X554UNS, X464UNV, X474HB, X464UNS, X554UNV, X555UNS, X555UNV, X754HB, X554HB, E705, E805, E905, UN551S, UN551VS, X551UHD, X651UHD, X841UHD, X981UHD, MD551C8) allows an attacker execute remote code by sending unintended parameters in http request.

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

The underlying weakness: Improper Limitation of a Pathname to a Restricted Directory

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

How developers prevent this class of flaw

  • For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.

More Improper Limitation of a Pathname to a Restricted Directory vulnerabilities (CWE-22)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Improper Limitation of a Pathname to a Restricted Directory vulnerabilities

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