Detections
Analytics
Alibaba Cloud Linux 3 : 0070: curl (ALINUX3-SA-2021:0070)
medium Nessus Plugin ID 236733
Synopsis
The remote Alibaba Cloud Linux host is missing one or more security updates.Description
The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2021:0070 advisory.Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:
CVE-2021-22922:
When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink XML file.The metalink XML file points out to the client how to get the same contentfrom a set of different URLs, potentially hosted by different servers and theclient can then download the file from one or several of them. In a serial orparallel manner.If one of the servers hosting the contents has been breached and the contentsof the specific file on that server is replaced with a modified payload, curlshould detect this when the hash of the file mismatches after a completeddownload.
It should remove the contents and instead try getting the contentsfrom another URL. This is not done, and instead such a hash mismatch is onlymentioned in text and the potentially malicious content is kept in the file ondisk.
CVE-2021-22923:
When curl is instructed to get content using the metalink feature, and a user name and password are used to download the metalink XML file, those same credentials are then subsequently passed on to each of the servers from which curl will download or try to download the contents from. Often contrary to the user's expectations and intentions and without telling the user it happened.
CVE-2021-22924:
libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.
Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.
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
http://mirrors.aliyun.com/alinux/3/cve/alinux3-sa-20210070.xml
Plugin Details
Severity: Medium
ID: 236733
File Name: alinux3_sa_2021-0070.nasl
Version: 1.1
Type: local
Published: 5/14/2025
Updated: 5/14/2025
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.4
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N
CVSS Score Source: CVE-2021-22924
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.9
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS Score Source: CVE-2021-22922
Vulnerability Information
CPE: p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:curl-debugsource, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:libcurl-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:libcurl-minimal-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:libcurl-debuginfo, cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:libcurl, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:curl-minimal-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:curl-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:curl-minimal, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:libcurl-minimal, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:curl
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/Alibaba/release, Host/Alibaba/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 9/26/2021
Vulnerability Publication Date: 7/25/2021