A flaw was found in the way the ClassFileParser class implementation in the Hotspot component of OpenJDK performed validation of inner class index values. A specially-crafted class file could cause a Java virtual machine to crash when loaded.
An unspecified vulnerability in Java SE related to the JSSE component could allow an unauthenticated attacker to obtain sensitive information resulting in a low confidentiality impact using unknown attack vectors.
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udpinput() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the tftpinput() function and could occur while processing a udp packet that is smaller than the size of the 'tftpt' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality.
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootpinput() function and could occur while processing a udp packet that is smaller than the size of the 'bootpt' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality.
Impact Unauthorised users can access the membership (list of members, with their display names) of a room if they know the ID of the room. The vulnerability is limited to rooms with shared history visibility. Furthermore, the unauthorised user must be using an account on a vulnerable homeserver that is in the room.
Patches Server administrators should upgrade to 1.41.1 or later.
Workarounds Administrators of servers that use a reverse proxy could, with potentially unacceptable loss of functionality, block the following endpoints: /matrix/client/r0/rooms/{roomid}/members with at query parameter /matrix/client/unstable/rooms/{roomid}/members with at query parameter
References n/a
For more information If you have any questions or comments about this advisory, e-mail us at security@matrix.org.
Impact Unauthorised users can access the name, avatar, topic and number of members of a room if they know the ID of the room. This vulnerability is limited to homeservers where: - the vulnerable homeserver is in the room; and - untrusted users are permitted to create groups (communities).
By default, only homeserver administrators can create groups. However, homeserver administrators can already access this information in the database or using the admin API. As a result, only homeservers where the configuration setting enablegroupcreation has been set to true are impacted.
Patches Server administrators should upgrade to 1.41.1 or higher.
Workarounds Server administrators can set enablegroupcreation to false in their homeserver configuration (this is the default value) to prevent creation of groups by non-administrators.
Administrators that are using a reverse proxy could, with partial loss of group functionality, block the following endpoints: /matrix/client/r0/groups/{groupid}/rooms /matrix/client/unstable/groups/{groupid}/rooms
References n/a
For more information If you have any questions or comments about this advisory, e-mail us at security@matrix.org.
Eclipse Jetty could allow a remote authenticated attacker to obtain sensitive information, caused by a flaw when the ${jetty.base} directory or the ${jetty.base}/webapps directory is a symlink. By sending a specially-crafted request, an attacker could exploit this vulnerability to obtain webapp directory contents information, and use this information to launch further attacks against the affected system.
A flaw was found in the way curl handled telnet protocol option for sending environment variables, which could lead to sending of uninitialized data from a stack-based buffer to the server. This issue leads to potentially revealing sensitive internal information to the server using a clear-text network protocol.