#VU76233 Use-after-free in cURL - CVE-2023-28319

Vulnerability identifier: #VU76233

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-28319

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
cURL
Client/Desktop applications / Other client software

Vendor: curl.haxx.se

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a use-after-free error when checking the SSH sha256 fingerprint. A remote attacker can use the application to connect to a malicious SSH server, trigger a use-after-free error and gain access to potentially sensitive information.

Successful exploitation of the vulnerability requires usage of the the CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 option, and also CURLOPT_VERBOSE or CURLOPT_ERRORBUFFER options have to be set.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

cURL: 7.81.0 - 8.0.1

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External links
https://curl.haxx.se/docs/CVE-2023-28319.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.