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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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)

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.

    2023-10-12: CVE-2023-4785 was added to this 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)

    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)

Tenable has extracted the preceding description block directly from the tested product 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 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	Type	Severity
332541	Photon OS 5.0: Grpc PHSA-2023-5.0-91-0068	Nessus	PhotonOS Local Security Checks	Local	medium
253154	Linux Distros Unpatched Vulnerability : CVE-2023-32732	Nessus	Misc.	Local	medium
421624	SCA: security update for grpc, grpcio, io.grpc:grpc-protobuf (GHSA-9hxf-ppjv-w6rq)	Tenable Cloud Security	SCA Checks	Local	medium
421624	SCA: security update for grpc, grpcio, io.grpc:grpc-protobuf (GHSA-9hxf-ppjv-w6rq)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
204345	Photon OS 5.0: Grpc PHSA-2023-5.0-0068	Nessus	PhotonOS Local Security Checks	Local	medium
190881	SUSE SLED15: abseil-cpp-devel / grpc-devel / grpc-source / libabsl2308_0_0 / etc (SUSE-SU-2024:0573-1)	Nessus	SuSE Local Security Checks	Local	medium
185231	Fedora 39 : grpc (2023-8570e0055b)	Nessus	Fedora Local Security Checks	Local	critical
179767	Amazon Linux 2023 : grpc, grpc-cpp, grpc-data (ALAS2023-2023-282)	Nessus	Amazon Linux Local Security Checks	Local	critical
178739	Fedora 38 : grpc (2023-15b3e80753)	Nessus	Fedora Local Security Checks	Local	critical
178737	Fedora 37 : grpc (2023-6cad6e5003)	Nessus	Fedora Local Security Checks	Local	critical

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CVE-2023-32732

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