Detections
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Alpine: libcurl, multiple curl packages: security update to 8.4.0-r0
critical Tenable Cloud Security Plugin ID 423833
Description
There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:- This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to
pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting
done by curl itself, the maximum length that host name can be is 255 bytes. If the host name is detected
to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due
to this bug, the local variable that means "let the host resolve the name" could get the wrong value
during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target
buffer instead of copying just the resolved address there. The target buffer being a heap based buffer,
and the host name coming from the URL that curl has been told to operate with. (CVE-2023-38545)
- This flaw allows an attacker to insert cookies at will into a running program using libcurl, if the
specific series of conditions are met. libcurl performs transfers. In its API, an application creates
"easy handles" that are the individual handles for single transfers. libcurl provides a function call that
duplicates en easy handle called
[curl_easy_duphandle](https://curl.se/libcurl/c/curl_easy_duphandle.html). If a transfer has cookies
enabled when the handle is duplicated, the cookie-enable state is also cloned - but without cloning the
actual cookies. If the source handle did not read any cookies from a specific file on disk, the cloned
version of the handle would instead store the file name as `none` (using the four ASCII letters, no
quotes). Subsequent use of the cloned handle that does not explicitly set a source to load cookies from
would then inadvertently load cookies from a file named `none` - if such a file exists and is readable in
the current directory of the program using libcurl. And if using the correct file format of course.
(CVE-2023-38546)
See Also
Plugin Details
Severity: Critical
ID: 423833
Version: Revision 1.15
Type: Local
Published: 4/4/2025
Updated: 11/10/2025
Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: High
Score: 8.9
Percentile: 99.7
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 8.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2023-38545
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 9.4
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C
Vulnerability Information
Exploit Available: true
Exploit Ease: Exploits are available
Vulnerability Publication Date: 10/10/2023
Reference Information
CVE: CVE-2023-38545, CVE-2023-38546
IAVA: 2023-A-0531-S