Stack-based buffer overflow in the ast_parse_digest function in main/utils.c in Asterisk 1.8.x before 1.8.10.1 and 10.x before 10.2.1 allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a long string in an HTTP Digest Authentication header.

The remote host is affected by the vulnerability described in GLSA-201203-21 (Asterisk: Multiple vulnerabilities)

    Two vulnerabilities have been found in Asterisk:
      The 'milliwatt_generate()' function in app_milliwatt.c is vulnerable         to a stack overrun (AST-2012-002).
      The 'ast_parse_digest()' function in utils.c is vulnerable to a         stack-based buffer overflow (AST-2012-003).
  Impact :

    A remote unauthenticated attacker could execute arbitrary code or cause       a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The Asterisk Development Team has announced security releases for Asterisk 1.6.2, 1.8, and 10. The available security releases are released as versions 1.6.2.24, 1.8.11.1, and 10.3.1.

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

The release of Asterisk 1.6.2.24, 1.8.11.1, and 10.3.1 resolve the following two issues :

  - A permission escalation vulnerability in Asterisk     Manager Interface. This would potentially allow remote     authenticated users the ability to execute commands on     the system shell with the privileges of the user running     the Asterisk application.

  - A heap overflow vulnerability in the Skinny Channel     driver. The keypad button message event failed to check     the length of a fixed length buffer before appending a     received digit to the end of that buffer. A remote     authenticated user could send sufficient keypad button     message events that the buffer would be overrun.

In addition, the release of Asterisk 1.8.11.1 and 10.3.1 resolve the following issue :

  - A remote crash vulnerability in the SIP channel driver     when processing UPDATE requests. If a SIP UPDATE request     was received indicating a connected line update after a     channel was terminated but before the final destruction     of the associated SIP dialog, Asterisk would attempt a     connected line update on a non-existing channel, causing     a crash.

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

For more information about the details of these vulnerabilities, please read security advisories AST-2012-004, AST-2012-005, and AST-2012-006, 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/asterisk/releases/ChangeLo g-1.6.2.24 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.11.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.3.1

The security advisories are available at :

  -     http://downloads.asterisk.org/pub/security/AST-2012-004.
    pdf

    -       http://downloads.asterisk.org/pub/security/AST-2012-00       5.pdf

    -       http://downloads.asterisk.org/pub/security/AST-2012-00       6.pdf

Update to 1.8.11.0 Update to 1.8.10.1, which fixes 2 security vulnerabilities.

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.

Update to 10.2.1, which fixes 2 security vulnerabilities.

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.

Update to 1.8.10.1, which fixes 2 security vulnerabilities.

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.

Update to 1.8.10.1, which fixes 2 security vulnerabilities. The Asterisk Development Team has announced security releases for Asterisk 1.4, 1.6.2 and 1.8. The available security releases are released as versions 1.4.43, 1.6.2.21 and 1.8.7.2.

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

The release of Asterisk versions 1.4.43, 1.6.2.21, and 1.8.7.2 resolves an issue with possible remote enumeration of SIP endpoints with differing NAT settings.

The release of Asterisk versions 1.6.2.21 and 1.8.7.2 resolves a remote crash possibility with SIP when the 'automon' feature is enabled.

The issues and resolutions are described in the AST-2011-013 and AST-2011-014 security advisories.

For more information about the details of these vulnerabilities, please read the security advisories AST-2011-013 and AST-2011-014, 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/asterisk/releases/ChangeLo g-1.4.43 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.6.2.21 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.7.2

Security advisory AST-2011-013 is available at :

  -     http://downloads.asterisk.org/pub/security/AST-2011-013.
    pdf

Security advisory AST-2011-014 is available at :

  -     http://downloads.asterisk.org/pub/security/AST-2011-014.
    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.

According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by a vulnerability that could allow a remote attacker to crash the server, or possibly inject arbitrary code by sending an arbitrarily long string value for HTTP Digest Authentication.

ID	Name	Product	Family	Severity
59613	GLSA-201203-21 : Asterisk: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
59002	Fedora 17 : asterisk-10.3.1-1.fc17 (2012-6704)	Nessus	Fedora Local Security Checks	high
58981	Fedora 16 : asterisk-1.8.11.1-1.fc16 (2012-6612)	Nessus	Fedora Local Security Checks	high
58691	Fedora 17 : asterisk-10.2.1-1.fc17 (2012-4230)	Nessus	Fedora Local Security Checks	high
58550	Fedora 16 : asterisk-1.8.10.1-1.fc16 (2012-4318)	Nessus	Fedora Local Security Checks	high
58549	Fedora 15 : asterisk-1.8.10.1-1.fc15 (2012-4259)	Nessus	Fedora Local Security Checks	high
58433	Asterisk ast_parse_digest Function HTTP Digest Authentication String Parsing Remote Overflow (AST-2012-003)	Nessus	Misc.	critical

Detections

Analytics

CVE-2012-1184

critical

Tenable Plugins

high

high

high

high

high

high

critical