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CVE-2017-5209: Libimobiledevice Libplist: Information disclosure

CVE-2017-5209 is rated critical with a CVSS v3.0 base score of 9.1 and affects Libimobiledevice Libplist. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.

Vulnerability description

The base64decode function in base64.c in libimobiledevice libplist through 1.12 allows attackers to obtain sensitive information from process memory or cause a denial of service (buffer over-read) via split encoded Apple Property List data.

Severity breakdown

CVSS v3.0 9.1: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

• Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
• Attack complexity: Low. No special conditions; the attack can be repeated reliably.
• Privileges required: None. No account or prior access is needed.
• User interaction: None. No action from any user is needed.
• Scope: Unchanged. Impact stays within the vulnerable component.
• Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
• Integrity impact: None. No loss of integrity.
• Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-125: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

Affected products

• Libimobiledevice Libplist: up to and including 1.12

References

• https://github.com/libimobiledevice/libplist/commit/3a55ddd3c4c11ce75a86afbefd085d8d397ff957
• http://www.securityfocus.com/bid/95385
• https://lists.debian.org/debian-lts-announce/2020/04/msg00002.html