CVE-2021-40528
CVSS V2 Low 2.6
CVSS V3 Medium 5.9
Description
The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.
Overview
- CVE ID
- CVE-2021-40528
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-09-06T19:15:07
- Last Modified Date
- 2022-12-07T01:36:08
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:* | 1 | OR | 1.9.4 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:H/Au:N/C:P/I:N/A:N
- Access Vector
- NETWORK
- Access Compatibility
- HIGH
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 2.6
- Severity
- LOW
- Exploitability Score
- 4.9
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- HIGH
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- NONE
- Base Score
- 5.9
- Base Severity
- MEDIUM
- Exploitability Score
- 2.2
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://eprint.iacr.org/2021/923 | Technical Description Third Party Advisory |
| https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=3462280f2e23e16adf3ed5176e0f2413d8861320 | Mailing List Patch Third Party Advisory |
| https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1 | Third Party Advisory |
| https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2 | Exploit Third Party Advisory |
| https://security.gentoo.org/glsa/202210-13 |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-40528 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40528 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:44:33 | Added to TrackCVE | |||
| 2022-12-05 09:40:13 | 2021-09-06T19:15Z | 2021-09-06T19:15:07 | CVE Published Date | updated |
| 2022-12-05 09:40:13 | 2022-10-31T04:15:18 | CVE Modified Date | updated | |
| 2022-12-05 09:40:13 | Undergoing Analysis | Vulnerability Status | updated | |
| 2022-12-05 09:40:17 | References | updated | ||
| 2022-12-07 02:12:29 | 2022-12-07T01:36:08 | CVE Modified Date | updated | |
| 2022-12-07 02:12:29 | Undergoing Analysis | Analyzed | Vulnerability Status | updated |