Matrix-android-sdk2 is the Matrix SDK for Android. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround. Out of caution, several other checks have been audited or added. matrix-android-sdk2 version 1.5.1 has been modified to only accept Olm-encrypted to-device messages and to stop signing backups on a successful decryption. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-android-sdk2 would then additionally sign such a key backup with its device key, spilling trust over to other devices trusting the matrix-android-sdk2 device. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. Prior to version 1.5.1, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield.

Improper authorization in Dynamic Lockscreen prior to SMR Sep-2022 Release 1 in Android R(11) and 3.3.03.66 in Android S(12) allows unauthorized use of javascript interface api. Improper access control vulnerability in ProfileSharingAccount in Group Sharing prior to versions 13.0.6.15 in Android S(12), 13.0.6.14 in Android R(11) and below allows attackers to identify the device. In certain scenarios, application might also be susceptible to replay attacks. SAP Customer Data Cloud (Gigya mobile app for Android) - version 7.4, uses encryption method which lacks proper diffusion and does not hide the patterns well. This can lead to information disclosure and modification of certain user settings.

SAP Customer Data Cloud (Gigya mobile app for Android) - version 7.4, uses insecure random number generator program which makes it easy for the attacker to predict future random numbers.

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