CVE-2017-11136 Information

Description

An issue was discovered in heinekingmedia StashCat through 1.7.5 for Android through 0.0.80w for Web and through 0.0.86 for Desktop. It uses RSA to exchange a secret for symmetric encryption of messages. However the private RSA key is not only stored on the client but transmitted to the backend too. Moreover the key to decrypt the private key is composed of the first 32 bytes of the SHA-512 hash of the user password. But this hash is stored on the backend too. Therefore everyone with access to the backend database can read the transmitted secret for symmetric encryption hence can read the communication.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

http://seclists.org/fulldisclosure/2017/Jul/90

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5