Ubuntu.comUB:CVE-2021-33560CVE-2021-33560
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
0.002 Low
EPSS
Percentile
61.6%
Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption
because it lacks exponent blinding to address a side-channel attack against
mpi_powm, and the window size is not chosen appropriately. This, for
example, affects use of ElGamal in OpenPGP.
Bugs
Notes
| Author | Note |
|---|---|
| mdeslaur | This CVE was originally for the issue that is now CVE=2021-40528 but somehow got switched to the exponent blinding issue instead. The fix to add exponent blinding appears to only have been added to 1.9.x but never backported to 1.8.x, contrary to the CVE description The commit below was never backported to 1.8.x because the upstream developers consider this hardening and not a security issue. |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | libgcrypt20 | <Â 1.8.1-4ubuntu1.3 | UNKNOWN |
| ubuntu | 20.04 | noarch | libgcrypt20 | <Â 1.8.5-5ubuntu1.1 | UNKNOWN |
| ubuntu | 21.04 | noarch | libgcrypt20 | <Â 1.8.7-2ubuntu2.1 | UNKNOWN |
| ubuntu | 21.10 | noarch | libgcrypt20 | <Â 1.8.7-5ubuntu2 | UNKNOWN |
| ubuntu | 22.04 | noarch | libgcrypt20 | <Â 1.8.7-5ubuntu2 | UNKNOWN |
| ubuntu | 22.10 | noarch | libgcrypt20 | <Â 1.8.7-5ubuntu2 | UNKNOWN |
| ubuntu | 23.04 | noarch | libgcrypt20 | <Â 1.8.7-5ubuntu2 | UNKNOWN |
| ubuntu | 23.10 | noarch | libgcrypt20 | <Â 1.8.7-5ubuntu2 | UNKNOWN |
| ubuntu | 24.04 | noarch | libgcrypt20 | <Â 1.8.7-5ubuntu2 | UNKNOWN |
| ubuntu | 16.04 | noarch | libgcrypt20 | <Â 1.6.5-2ubuntu0.6+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only | UNKNOWN |
Related
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
0.002 Low
EPSS
Percentile
61.6%