Asterisk Multiple Vulnerabilities (AST-2016-001 - AST-2016-003) (BEAST)
medium Nessus Plugin ID 88715
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Synopsis
A telephony application running on the remote host is affected by multiple vulnerabilities.Description
According to its SIP banner, the version of Asterisk running on the remote host is affected by the following vulnerabilities :- An information disclosure vulnerability, known as BEAST, exists in the SSL 3.0 and TLS 1.0 protocols due to a flaw in the way the initialization vector (IV) is selected when operating in cipher-block chaining (CBC) modes. A man-in-the-middle attacker can exploit this to obtain plaintext HTTP header data, by using a blockwise chosen-boundary attack (BCBA) on an HTTPS session, in conjunction with JavaScript code that uses the HTML5 WebSocket API, the Java URLConnection API, or the Silverlight WebClient API. (CVE-2011-3389)
- An integer overflow condition exists in sip.conf due to improper validation of user-supplied input when handling 'timert1' values. A remote attacker can exploit this to cause a denial of service.
- An unspecified flaw exists due to improper handling of FAT data in UDPTL packets. A remote attacker can exploit this to cause a denial of service.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Upgrade to Asterisk version 11.21.1 / 13.7.1 / 11.6-cert12 / 13.1-cert3. Alternatively, apply the appropriate patch referenced in the vendor advisories.See Also
http://downloads.asterisk.org/pub/security/AST-2016-001.html
http://downloads.asterisk.org/pub/security/AST-2016-002.html
http://downloads.asterisk.org/pub/security/AST-2016-003.html
https://www.imperialviolet.org/2011/09/23/chromeandbeast.html
Plugin Details
Severity: Medium
ID: 88715
File Name: asterisk_ast_2016_003.nasl
Version: 1.12
Type: remote
Family: Misc.
Published: 2/12/2016
Updated: 11/19/2019
Dependencies: asterisk_detection.nasl
Configuration: Enable paranoid mode
Risk Information
CVSS Score Source: CVE-2011-3389
VPR
Risk Factor: Low
Score: 1.4
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.2
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N
Temporal Vector: E:U/RL:OF/RC:C
Vulnerability Information
CPE: cpe:/a:digium:asterisk
Required KB Items: asterisk/sip_detected, Settings/ParanoidReport
Exploit Ease: No known exploits are available
Patch Publication Date: 2/3/2016
Vulnerability Publication Date: 8/31/2011
Reference Information
CVE: CVE-2011-3389
CERT: 864643