The SIP channel driver in Asterisk Open Source 1.8.x before 1.8.20.2, 10.x before 10.12.2, and 11.x before 11.2.2; Certified Asterisk 1.8.15 before 1.8.15-cert2; Asterisk Business Edition (BE) C.3.x before C.3.8.1; and Asterisk Digiumphones 10.x-digiumphones before 10.12.2-digiumphones exhibits different behavior for invalid INVITE, SUBSCRIBE, and REGISTER transactions depending on whether the user account exists, which allows remote attackers to enumerate account names by (1) reading HTTP status codes, (2) reading additional text in a 403 (aka Forbidden) response, or (3) observing whether certain retransmissions occur.

The remote host is affected by the vulnerability described in GLSA-201401-15 (Asterisk: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Asterisk. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could execute arbitrary code with the privileges of       the process, cause a Denial of Service condition, or obtain sensitive       information.
  Workaround :

    There is no known workaround at this time.

Multiple vulnerablilities was identified and fixed in asterisk :

The SIP channel driver in Asterisk Open Source 1.8.x before 1.8.20.2, 10.x before 10.12.2, and 11.x before 11.2.2; Certified Asterisk 1.8.15 before 1.8.15-cert2; Asterisk Business Edition (BE) C.3.x before C.3.8.1; and Asterisk Digiumphones 10.x-digiumphones before 10.12.2-digiumphones exhibits different behavior for invalid INVITE, SUBSCRIBE, and REGISTER transactions depending on whether the user account exists, which allows remote attackers to enumerate account names by (1) reading HTTP status codes, (2) reading additional text in a 403 (aka Forbidden) response, or (3) observing whether certain retransmissions occur (CVE-2013-2264).

Stack-based buffer overflow in res/res_format_attr_h264.c in Asterisk Open Source 11.x before 11.2.2 allows remote attackers to execute arbitrary code via a long sprop-parameter-sets H.264 media attribute in a SIP Session Description Protocol (SDP) header (CVE-2013-2685).

main/http.c in the HTTP server in Asterisk Open Source 1.8.x before 1.8.20.2, 10.x before 10.12.2, and 11.x before 11.2.2; Certified Asterisk 1.8.15 before 1.8.15-cert2; and Asterisk Digiumphones 10.x-digiumphones before 10.12.2-digiumphones does not properly restrict Content-Length values, which allows remote attackers to conduct stack-consumption attacks and cause a denial of service (daemon crash) via a crafted HTTP POST request. NOTE: this vulnerability exists because of an incorrect fix for CVE-2012-5976 (CVE-2013-2686).

The updated packages have upgraded to the 11.2.2 version which is not vulnerable to these issues

According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by the following vulnerabilities :

  - A buffer overflow exists in the SIP SDP headers and h264 video handling. NOTE:Only Affects version less than 11.2.2 (CVE-2013-2685)

  - A denial of server exists in the HTTP POST requests with very large 'Conten-Length' header values. (CVE-2013-2686)

  - An information disclosure exists in the INVITE, SUBSCRIBE and REGISTER transactions and improper settings for the configureatio options. (CVE-2013-2264)

According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by a username disclosure vulnerability related to INVITE, SUBSCRIBE and REGISTER transactions and improper settings for the configuration options 'alwaysauthreject', 'allowguest' and 'autocreatepeer'.

Asterisk project reports :

Buffer Overflow Exploit Through SIP SDP Header

Username disclosure in SIP channel driver

Denial of Service in HTTP server

The Asterisk Development Team has announced security releases for Certified Asterisk 1.8.15 and Asterisk 1.8, 10, and 11. The available security releases are released as versions 1.8.15-cert2, 1.8.20.2, 10.12.2, 10.12.2-digiumphones, and 11.2.2.

These releases are available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases

The release of these versions resolve the following issues :

  - A possible buffer overflow during H.264 format     negotiation. The format attribute resource for H.264     video performs an unsafe read against a media attribute     when parsing the SDP.

    This vulnerability only affected Asterisk 11.

  - A denial of service exists in Asterisk's HTTP server.
    AST-2012-014, fixed in January of this year, contained a     fix for Asterisk's HTTP server for a remotely-triggered     crash. While the fix prevented the crash from being     triggered, a denial of service vector still exists with     that solution if an attacker sends one or more HTTP POST     requests with very large Content-Length values.

    This vulnerability affects Certified Asterisk 1.8.15,     Asterisk 1.8, 10, and 11

  - A potential username disclosure exists in the SIP     channel driver. When authenticating a SIP request with     alwaysauthreject enabled, allowguest disabled, and     autocreatepeer disabled, Asterisk discloses whether a     user exists for INVITE, SUBSCRIBE, and REGISTER     transactions in multiple ways.

    This vulnerability affects Certified Asterisk 1.8.15,     Asterisk 1.8, 10, and 11

These issues and their resolutions are described in the security advisories.

For more information about the details of these vulnerabilities, please read security advisories AST-2013-001, AST-2013-002, and AST-2013-003, which were released at the same time as this announcement.

For a full list of changes in the current releases, please see the ChangeLogs :

http://downloads.asterisk.org/pub/telephony/certified-asterisk/release s/ChangeLog-1.8.15-cert2 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.20.2 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.12.2 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.12.2-digiumphones http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-11.2.2

The security advisories are available at :

  -     http://downloads.asterisk.org/pub/security/AST-2013-001.
    pdf

    -       http://downloads.asterisk.org/pub/security/AST-2013-00       2.pdf

    -       http://downloads.asterisk.org/pub/security/AST-2013-00       3.pdf

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
72054	GLSA-201401-15 : Asterisk: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
66152	Mandriva Linux Security Advisory : asterisk (MDVSA-2013:140)	Nessus	Mandriva Local Security Checks	high
6750	Asterisk Multiple Vulnerabilities (AST-2013-001 / AST-2013-002 / AST-2013-003)	Nessus Network Monitor	Generic	high
65898	Asterisk SIP Channel Driver Username Disclosure (AST-2013-003)	Nessus	Misc.	medium
65852	FreeBSD : asterisk -- multiple vulnerabilities (daf0a339-9850-11e2-879e-d43d7e0c7c02)	Nessus	FreeBSD Local Security Checks	high
65830	Fedora 17 : asterisk-10.12.2-1.fc17 (2013-4528)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2013-2264

medium

Tenable Plugins

high

high

high

medium

high

medium