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AlmaLinux 9 : go-toolset and golang (ALSA-2023:5738)

high Nessus Plugin ID 183218

Synopsis

The remote AlmaLinux host is missing one or more security updates.

Description

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2023:5738 advisory.

 - Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable. (CVE-2023-29409)

 - A malicious HTTP/2 client which rapidly creates requests and immediately resets them can cause excessive server resource consumption. While the total number of requests is bounded by the http2.Server.MaxConcurrentStreams setting, resetting an in-progress request allows the attacker to create a new request while the existing one is still executing. With the fix applied, HTTP/2 servers now bound the number of simultaneously executing handler goroutines to the stream concurrency limit (MaxConcurrentStreams). New requests arriving when at the limit (which can only happen after the client has reset an existing, in-flight request) will be queued until a handler exits. If the request queue grows too large, the server will terminate the connection. This issue is also fixed in golang.org/x/net/http2 for users manually configuring HTTP/2. The default stream concurrency limit is 250 streams (requests) per HTTP/2 connection. This value may be adjusted using the golang.org/x/net/http2 package; see the Server.MaxConcurrentStreams setting and the ConfigureServer function. (CVE-2023-39325)

 - 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)

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

Solution

Update the affected packages.

See Also

https://errata.almalinux.org/9/ALSA-2023-5738.html

Plugin Details

Severity: High

ID: 183218

File Name: alma_linux_ALSA-2023-5738.nasl

Version: 1.4

Type: local

Published: 10/17/2023

Updated: 2/23/2024

Supported Sensors: Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.1

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2023-44487

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:alma:linux:9::appstream, p-cpe:/a:alma:linux:golang-tests, p-cpe:/a:alma:linux:golang-docs, p-cpe:/a:alma:linux:golang, cpe:/o:alma:linux:9::supplementary, p-cpe:/a:alma:linux:golang-misc, p-cpe:/a:alma:linux:golang-src, cpe:/o:alma:linux:9::highavailability, cpe:/o:alma:linux:9::resilientstorage, cpe:/o:alma:linux:9::sap_hana, p-cpe:/a:alma:linux:golang-bin, cpe:/o:alma:linux:9::sap, cpe:/o:alma:linux:9::crb, cpe:/o:alma:linux:9::realtime, cpe:/o:alma:linux:9, p-cpe:/a:alma:linux:go-toolset, p-cpe:/a:alma:linux:golang-race, cpe:/o:alma:linux:9::nfv, cpe:/o:alma:linux:9::baseos

Required KB Items: Host/local_checks_enabled, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/16/2023

Vulnerability Publication Date: 8/2/2023

CISA Known Exploited Vulnerability Due Dates: 10/31/2023

Reference Information

CVE: CVE-2023-29409, CVE-2023-39325, CVE-2023-44487

CWE: 400

IAVB: 2023-B-0064-S, 2023-B-0080-S, 2023-B-0083-S