Executive Summary
| Informations | |||
|---|---|---|---|
| Name | CVE-2021-3634 | First vendor Publication | 2021-08-31 |
| Vendor | Cve | Last vendor Modification | 2023-12-22 |
Security-Database Scoring CVSS v3
| Cvss vector : CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | |||
|---|---|---|---|
| Overall CVSS Score | 6.5 | ||
| Base Score | 6.5 | Environmental Score | 6.5 |
| impact SubScore | 3.6 | Temporal Score | 6.5 |
| Exploitabality Sub Score | 2.8 | ||
| Attack Vector | Network | Attack Complexity | Low |
| Privileges Required | Low | User Interaction | None |
| Scope | Unchanged | Confidentiality Impact | None |
| Integrity Impact | None | Availability Impact | High |
| Calculate full CVSS 3.0 Vectors scores | |||
Security-Database Scoring CVSS v2
| Cvss vector : (AV:N/AC:L/Au:S/C:N/I:N/A:P) | |||
|---|---|---|---|
| Cvss Base Score | 4 | Attack Range | Network |
| Cvss Impact Score | 2.9 | Attack Complexity | Low |
| Cvss Expoit Score | 8 | Authentication | Requires single instance |
| Calculate full CVSS 2.0 Vectors scores | |||
Detail
| A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shared secrets during the lifetime of the session. One of them is called secret_hash and the other session_id. Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked as long as these buffers were same. But the key re-exchange operation can also change the key exchange method, which can be based on hash of different size, eventually creating "secret_hash" of different size than the session_id has. This becomes an issue when the session_id memory is zeroed or when it is used again during second key re-exchange. |
Original Source
| Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3634 |
CWE : Common Weakness Enumeration
| % | Id | Name |
|---|---|---|
| 100 % | CWE-787 | Out-of-bounds Write (CWE/SANS Top 25) |
CPE : Common Platform Enumeration
Sources (Detail)
Alert History
| Date | Informations |
|---|---|
| 2023-12-22 13:28:11 |
|
| 2023-11-07 21:34:08 |
|
| 2023-08-02 02:06:49 |
|
| 2022-11-23 02:09:50 |
|
| 2022-11-23 01:59:56 |
|
| 2022-11-22 21:27:37 |
|
| 2022-11-16 09:27:27 |
|
| 2022-10-28 13:02:19 |
|
| 2022-10-07 21:27:40 |
|
| 2022-05-26 21:27:38 |
|
| 2022-04-26 02:05:56 |
|
| 2022-03-05 00:23:14 |
|
| 2022-02-07 21:23:13 |
|
| 2021-10-18 17:23:03 |
|
| 2021-10-08 00:23:06 |
|
| 2021-10-05 00:23:15 |
|
| 2021-09-29 09:23:32 |
|
| 2021-09-09 09:22:59 |
|
| 2021-09-01 00:22:51 |
|
| 2021-08-31 21:23:10 |
|
