Detections
Analytics

FreeBSD : polarssl -- denial of service vulnerability (72bf9e21-03df-11e3-bd8d-080027ef73ec)

medium Nessus Plugin ID 69337

Language:

Synopsis

The remote FreeBSD host is missing a security-related update.

Description

Paul Bakker reports :

A bug in the logic of the parsing of PEM encoded certificates in x509parse_crt() can result in an infinite loop, thus hogging processing power.

While parsing a Certificate message during the SSL/TLS handshake, PolarSSL extracts the presented certificates and sends them on to be parsed. As the RFC specifies that the certificates in the Certificate message are always X.509 certificates in DER format, bugs in the decoding of PEM certificates should normally not be triggerable via the SSL/TLS handshake.

Versions of PolarSSL prior to 1.1.7 in the 1.1 branch and prior to 1.2.8 in the 1.2 branch call the generic x509parse_crt() function for parsing during the handshake. x509parse_crt() is a generic functions that wraps parsing of both PEM-encoded and DER-formatted certificates.
As a result it is possible to craft a Certificate message that includes a PEM encoded certificate in the Certificate message that triggers the infinite loop.

Solution

Update the affected package.

See Also

http://www.nessus.org/u?8e94b2cf

http://www.nessus.org/u?1883aab3

Plugin Details

Severity: Medium

ID: 69337

File Name: freebsd_pkg_72bf9e2103df11e3bd8d080027ef73ec.nasl

Version: 1.6

Type: local

Published: 8/14/2013

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:polarssl, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 8/13/2013

Vulnerability Publication Date: 6/21/2013

Reference Information

CVE: CVE-2013-4623