CVE-2021-3304 : Sagemcom F@ST 3686 v2 3.495 devices have a buffer overflow via a long sessionKey

Sagemcom F@ST 3686 v2 3.495 devices have a buffer overflow via a long sessionKey to the goform/login URI.

Published 2021-01-26 18:16:30

Updated 2021-02-03 15:57:36

Source MITRE

View at NVD, CVE.org

Vulnerability category: Overflow

Products affected by CVE-2021-3304

Sagemcom » F@st 3686 Firmware » Version: 3.495
cpe:2.3:o:sagemcom:f\@st_3686_firmware:3.495:*:*:*:*:*:*:*
Matching versions
When used together with: Sagemcom » F@st 3686 » Version: V2

EPSS FAQ

0.51%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 64 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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, leading to a buffer overflow.

Assigned by: nvd@nist.gov (Primary)

https://twitter.com/j0nh4t/status/1349649975479840769

jonhat on Twitter: "Sagemcom F@ST3686 buf overflow. Reported 4 months ago, no fix. Mitigate by changing default IPs & remote management off. p=$(python -c 'print("A"*69)');curl --data "foo" http:/
Exploit;Third Party Advisory

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