gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy and a gRPC server: a base64 encoding error for `-bin` suffixed headers will result in a disconnection by the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in https://github.com/grpc/grpc/pull/32309 https://www.google.com/url

An update of the grpc package has been released.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:0573-1 advisory.

  - When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame.
    This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables     between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests     from the proxy being interpreted as containing headers from different proxy clients - leading to an     information leak that can be used for privilege escalation or data exfiltration. We recommend upgrading     beyond the commit contained in https://github.com/grpc/grpc/pull/33005     https://github.com/grpc/grpc/pull/33005 (CVE-2023-32731)

  - gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy     and a gRPC server: a base64 encoding error for `-bin` suffixed headers will result in a disconnection by     the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in     https://github.com/grpc/grpc/pull/32309 https://www.google.com/url (CVE-2023-32732)

  - gRPC contains a vulnerability that allows hpack table accounting errors could lead to unwanted disconnects     between clients and servers in exceptional cases/ Three vectors were found that allow the following DOS     attacks: - Unbounded memory buffering in the HPACK parser - Unbounded CPU consumption in the HPACK parser     The unbounded CPU consumption is down to a copy that occurred per-input-block in the parser, and because     that could be unbounded due to the memory copy bug we end up with an O(n^2) parsing loop, with n selected     by the client. The unbounded memory buffering bugs: - The header size limit check was behind the string     reading code, so we needed to first buffer up to a 4 gigabyte string before rejecting it as longer than 8     or 16kb. - HPACK varints have an encoding quirk whereby an infinite number of 0's can be added at the     start of an integer. gRPC's hpack parser needed to read all of them before concluding a parse. - gRPC's     metadata overflow check was performed per frame, so that the following sequence of frames could cause     infinite buffering: HEADERS: containing a: 1 CONTINUATION: containing a: 2 CONTINUATION: containing a: 3     etc (CVE-2023-33953)

  - The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation     can reset many streams quickly, as exploited in the wild in August through October 2023. (CVE-2023-44487)

  - Lack of error handling in the TCP server in Google's gRPC starting version 1.23 on posix-compatible     platforms (ex. Linux) allows an attacker to cause a denial of service by initiating a significant number     of connections with the server. Note that gRPC C++ Python, and Ruby are affected, but gRPC Java, and Go     are NOT affected. (CVE-2023-4785)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 39 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2023-8570e0055b advisory.

    Automatic update for grpc-1.48.4-20.fc39.

    ##### **Changelog**

    ```
    * Wed Jul  5 2023 Benjamin A. Beasley <code@musicinmybrain.net> - 1.48.4-20
    - Backport fix for CVE-2023-32732 (fix RHBZ#2214470)

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-282 advisory.

  - When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame.
    This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables     between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests     from the proxy being interpreted as containing headers from different proxy clients - leading to an     information leak that can be used for privilege escalation or data exfiltration. We recommend upgrading     beyond the commit contained in https://github.com/grpc/grpc/pull/33005     https://github.com/grpc/grpc/pull/33005 (CVE-2023-32731)

  - gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy     and a gRPC server: a base64 encoding error for `-bin` suffixed headers will result in a disconnection by     the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in     https://github.com/grpc/grpc/pull/32309 https://www.google.com/url (CVE-2023-32732)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 38 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-15b3e80753 advisory.

    Security fix for CVE-2023-32732

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 37 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2023-6cad6e5003 advisory.

    Security fix for CVE-2023-32732

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
204345	Photon OS 5.0: Grpc PHSA-2023-5.0-0068	Nessus	PhotonOS Local Security Checks	medium
190881	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : abseil-cpp, grpc, opencensus-proto, protobuf, python-abseil, python-grpcio, re2 (SUSE-SU-2024:0573-1)	Nessus	SuSE Local Security Checks	high
185231	Fedora 39 : grpc (2023-8570e0055b)	Nessus	Fedora Local Security Checks	critical
179767	Amazon Linux 2023 : grpc, grpc-cpp, grpc-data (ALAS2023-2023-282)	Nessus	Amazon Linux Local Security Checks	high
178739	Fedora 38 : grpc (2023-15b3e80753)	Nessus	Fedora Local Security Checks	critical
178737	Fedora 37 : grpc (2023-6cad6e5003)	Nessus	Fedora Local Security Checks	critical

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