Medium severity · published Jul 30, 2021
CVE-2021-37588
In Charm 0.43, any two users can collude to achieve the ability to decrypt YCT14 data
5.9
CVSS
0.9%
EPSS
No
On KEV
Description
In Charm 0.43, any two users can collude to achieve the ability to decrypt YCT14 data.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CH
Charm · Jhu
0.43 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-37588
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-37588
Third Party Advisory
https://eprint.iacr.org/2020/460
Third Party Advisory
https://github.com/JHUISI/charm/blob/dev/charm/schemes/abenc/abenc_yct14.py
Issue Tracking
https://github.com/JHUISI/charm/issues/276
Technical Description
https://www2.hci.uni-hannover.de/papers/Tan2019.pdf
More from Charm
6.5
CVE-2021-37587
In Charm 0.43, any single user can decrypt DAC-MACS or MA-ABE-YJ14 data