CVE-2021-44538
CVSS V2 High 7.5
CVSS V3 Critical 9.8
Description
The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.
Overview
- CVE ID
- CVE-2021-44538
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-12-14T14:15:09
- Last Modified Date
- 2022-04-12T18:15:20
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:matrix:element:*:*:*:*:desktop:*:*:* | 1 | OR | 1.9.7 | |
| cpe:2.3:a:matrix:element:*:*:*:*:web:*:*:* | 1 | OR | 1.9.7 | |
| cpe:2.3:a:matrix:javascript_sdk:*:*:*:*:*:*:*:* | 1 | OR | 2.4.2 | 15.2.1 |
| cpe:2.3:a:matrix:olm:*:*:*:*:*:*:*:* | 1 | OR | 3.1.4 | 3.2.8 |
| cpe:2.3:a:schildi:schildichat:*:*:*:*:desktop:*:*:* | 1 | OR | 1.9.7-sc1 | |
| cpe:2.3:a:schildi:schildichat:*:*:*:*:web:*:*:* | 1 | OR | 1.9.7-sc1 | |
| cpe:2.3:a:cinny_project:cinny:*:*:*:*:*:*:*:* | 1 | OR | 1.6.0 | |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:N/C:P/I:P/A:P
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- PARTIAL
- Availability Impact
- PARTIAL
- Base Score
- 7.5
- Severity
- HIGH
- Exploitability Score
- 10
- Impact Score
- 6.4
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 9.8
- Base Severity
- CRITICAL
- Exploitability Score
- 3.9
- Impact Score
- 5.9
References
| Reference URL | Reference Tags |
|---|---|
| https://matrix.org/blog/2021/12/13/disclosure-buffer-overflow-in-libolm-and-matrix-js-sdk | Patch Vendor Advisory |
| https://gitlab.matrix.org/matrix-org/olm/-/tags | Product Third Party Advisory |
| https://www.debian.org/security/2022/dsa-5034 | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html | Mailing List Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-44538 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44538 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 15:43:24 | Added to TrackCVE | |||
| 2022-12-06 03:46:39 | 2021-12-14T14:15Z | 2021-12-14T14:15:09 | CVE Published Date | updated |
| 2022-12-06 03:46:39 | 2022-04-12T18:15:20 | CVE Modified Date | updated | |
| 2022-12-06 03:46:39 | Analyzed | Vulnerability Status | updated |