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CVE-2017-11136

Status Candidate

Overview

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.

Related Files

heinekingmedia StashCat Cryptographic Issues
Posted Aug 1, 2017
Authored by Sebastian Horzela, Karsten Konig, Lennart Henke

heinekingmedia StashCat Android versions 1.7.5 and below, Web versions 0.0.80w and below, and Desktop versions 0.0.86 and below suffer from cryptographic and various other vulnerabilities.

tags | advisory, web, vulnerability
advisories | CVE-2017-11129, CVE-2017-11130, CVE-2017-11131, CVE-2017-11132, CVE-2017-11133, CVE-2017-11134, CVE-2017-11135, CVE-2017-11136
MD5 | 3700c972ed2653e77292c59e07cad216
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