CyberSecBulletin
CVE-2024-40763NVD status: Analyzed

SMA100: Heap-based Buffer Overflow

Published Updated By the CyberSecBulletin desk

CVE-2024-40763 is a high-severity heap-based buffer overflow vulnerability in SMA100 from SonicWall, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected SMA100 versions: 10.2.1.13-72sv and earlier versions. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.94% chance of exploitation within 30 days, higher than 62% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Sma 200 Firmware to 10.2.1.14-75sv or a later version.
  2. Update Sma 210 Firmware to 10.2.1.14-75sv or a later version.
  3. Update Sma 400 Firmware to 10.2.1.14-75sv or a later version.
  4. Read the advisory on psirt.global.sonicwall.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
SonicWallSMA10010.2.1.13-72sv and earlier versionsNot stated
SonicWallsma100_firmware10.2.1.13-72sv and earlierNot stated
SonicWallSma 200 Firmwarebefore 10.2.1.14-75sv10.2.1.14-75sv
SonicWallSma 210 Firmwarebefore 10.2.1.14-75sv10.2.1.14-75sv
SonicWallSma 400 Firmwarebefore 10.2.1.14-75sv10.2.1.14-75sv
SonicWallSma 410 Firmwarebefore 10.2.1.14-75sv10.2.1.14-75sv
SonicWallSma 500v Firmwarebefore 10.2.1.14-75sv10.2.1.14-75sv

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
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
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:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).

Official description

Heap-based buffer overflow vulnerability in the SonicWall SMA100 SSLVPN due to the use of strcpy. This allows remote authenticated attackers to cause Heap-based buffer overflow and potentially lead to code execution.

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

The underlying weakness: Heap-based Buffer Overflow

The product writes past the end of a buffer that was allocated on the heap.

How developers prevent this class of flaw

  • Pre-design: Use a language or compiler that performs automatic bounds checking.
  • Use an abstraction library to abstract away risky APIs. Not a complete solution.
  • 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 Heap-based Buffer Overflow vulnerabilities (CWE-122)

Timeline

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

References

Other vulnerabilities in SMA100

All SMA100 vulnerabilities

Recent Heap-based Buffer Overflow vulnerabilities

Spotted an error? Tell us.