Detections
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Amazon Linux 2 : curl (ALAS-2025-2724)
medium Nessus Plugin ID 213673
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Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
The version of curl installed on the remote host is prior to 8.3.0-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2025-2724 advisory.When curl is asked to use HSTS, the expiry time for a subdomain mightoverwrite a parent domain's cache entry, making it end sooner or later thanotherwise intended.
This affects curl using applications that enable HSTS and use URLs with theinsecure `HTTP://` scheme and perform transfers with hosts like`x.example.com` as well as `example.com` where the first host is a subdomainof the second host.
(The HSTS cache either needs to have been populated manually or there needs tohave been previous HTTPS accesses done as the cache needs to have entries forthe domains involved to trigger this problem.)
When `x.example.com` responds with `Strict-Transport-Security:` headers, thisbug can make the subdomain's expiry timeout *bleed over* and get set for theparent domain `example.com` in curl's HSTS cache.
The result of a triggered bug is that HTTP accesses to `example.com` getconverted to HTTPS for a different period of time than what was asked for bythe origin server. If `example.com` for example stops supporting HTTPS at itsexpiry time, curl might then fail to access `http://example.com` until the(wrongly set) timeout expires. This bug can also expire the parent's entry*earlier*, thus making curl inadvertently switch back to insecure HTTP earlierthan otherwise intended. (CVE-2024-9681)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Run 'yum update curl' to update your system.See Also
https://alas.aws.amazon.com/AL2/ALAS-2025-2724.html
Plugin Details
Severity: Medium
ID: 213673
File Name: al2_ALAS-2025-2724.nasl
Version: 1.2
Type: local
Agent: unix
Published: 1/9/2025
Updated: 1/16/2025
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.0
CVSS v2
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 4.8
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:P
CVSS Score Source: CVE-2024-9681
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.9
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:libcurl, p-cpe:/a:amazon:linux:libcurl-devel, p-cpe:/a:amazon:linux:curl-debuginfo, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:curl
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 1/4/2025
Vulnerability Publication Date: 11/6/2024
Reference Information
CVE: CVE-2024-9681
IAVA: 2024-A-0708-S