CyberSecBulletin
CVE-2023-0853NVD status: Modified

Canon Office/Small Office Multifunction…: Out-of-bounds Write

Published Updated By the CyberSecBulletin desk

CVE-2023-0853 is a critical-severity out-of-bounds write vulnerability in Canon Office/Small Office Multifunction Printers and Laser Printers from Canon, 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. There is no confirmed exploitation so far. EPSS estimates a 1.16% chance of exploitation within 30 days, higher than 68% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of Canon Office/Small Office Multifunction Printers and Laser Printers you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on psirt.canon 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
CanonCanon Office/Small Office Multifunction Printers and Laser PrintersNot specified in the recordNot stated
CanonMf642cdw Firmware11.04 and earlierNot stated
CanonMf644cdw Firmware11.04 and earlierNot stated
CanonMf741cdw Firmware11.04 and earlierNot stated
CanonMf743cdw Firmware11.04 and earlierNot stated
CanonMf745cdw Firmware11.04 and earlierNot stated
CanonLbp621c Firmware11.04 and earlierNot stated
CanonLbp622c Firmware11.04 and earlierNot stated
CanonLbp661c Firmware11.04 and earlierNot stated
CanonLbp662c Firmware11.04 and earlierNot stated
CanonLbp664c Firmware11.04 and earlierNot stated
CanonMf1127c Firmware11.04 and earlierNot stated
CanonMf262dw Ii Firmware11.04 and earlierNot stated
CanonMf264dw Ii Firmware11.04 and earlierNot stated
CanonMf267dw Ii Firmware11.04 and earlierNot stated
CanonMf269dw Ii Firmware11.04 and earlierNot stated
CanonMf269dw Vp Ii Firmware11.04 and earlierNot stated
CanonMf272dw Firmware11.04 and earlierNot stated
CanonMf273dw Firmware11.04 and earlierNot stated
CanonMf275dw Firmware11.04 and earlierNot stated
CanonMf641cw Firmware11.04 and earlierNot stated
CanonMf746cdw Firmware11.04 and earlierNot stated
CanonLbp122dw Firmware11.04 and earlierNot stated
CanonLbp1127c Firmware11.04 and earlierNot stated
CanonLbp622cdw Firmware11.04 and earlierNot stated

Version data comes from the organisation that assigned the CVE; 21 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 3.19.8CriticalCNA
CVSS 3.19.8CriticalNVD

Official description

Buffer overflow in mDNS NSEC record registering process of Office / Small Office Multifunction Printers and Laser Printers(*) which may allow an attacker on the network segment to trigger the affected product being unresponsive or to execute arbitrary code. *:Satera LBP660C Series/LBP620C Series/MF740C Series/MF640C Series firmware Ver.11.04 and earlier sold in Japan. Color imageCLASS LBP660C Series/LBP 620C Series/X LBP1127C/MF740C Series/MF640C Series/X MF1127C firmware Ver.11.04 and earlier sold in US. i-SENSYS LBP660C Series/LBP620C Series/MF740C Series/MF640C Series, C1127P, C1127iF, C1127i firmware Ver.11.04 and earlier sold in Europe.

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

The underlying weakness: Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended 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 Out-of-bounds Write vulnerabilities (CWE-787)

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

Other vulnerabilities in Canon Office/Small Office Multifunction Printers and Laser Printers

All Canon Office/Small Office Multifunction Printers and Laser Printers vulnerabilities

Recent Out-of-bounds Write vulnerabilities

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