Vulnerabilities > CVE-2011-2216 - Denial of Service vulnerability in Asterisk 'Contact' Header SIP Channel Driver
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
PARTIAL Summary
reqresp_parser.c in the SIP channel driver in Asterisk Open Source 1.8.x before 1.8.4.2 does not initialize certain strings, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a malformed Contact header. Per: http://cwe.mitre.org/data/definitions/476.html 'CWE-476: NULL Pointer Dereference'
Vulnerable Configurations
Nessus
NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_34CE58178D5611E0B5A26C626DD55A41.NASL description The Asterisk Development Team reports : If a remote user initiates a SIP call and the recipient picks up, the remote user can reply with a malformed Contact header that Asterisk will improperly handle and cause a crash due to a segmentation fault. last seen 2020-06-01 modified 2020-06-02 plugin id 54951 published 2011-06-03 reporter This script is Copyright (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/54951 title FreeBSD : asterisk -- Remote crash vulnerability (34ce5817-8d56-11e0-b5a2-6c626dd55a41) NASL family Fedora Local Security Checks NASL id FEDORA_2011-8319.NASL description The Asterisk Development Team has announced the release of Asterisk version 1.8.4.2, which is a security release for Asterisk 1.8. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases The release of Asterisk 1.8.4.2 resolves an issue with SIP URI parsing which can lead to a remotely exploitable crash : Remote Crash Vulnerability in SIP channel driver (AST-2011-007) The issue and resolution is described in the AST-2011-007 security advisory. For more information about the details of this vulnerability, please read the security advisory AST-2011-007, which was released at the same time as this announcement. For a full list of changes in the current release, please see the ChangeLog : http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.4.2 Security advisory AST-2011-007 is available at : http://downloads.asterisk.org/pub/security/AST-2011-007.pdf The Asterisk Development Team has announced the release of Asterisk 1.8.4.1. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/ The release of Asterisk 1.8.4.1 resolves several issues reported by the community. Without your help this release would not have been possible. Thank you! Below is a list of issues resolved in this release : - Fix our compliance with RFC 3261 section 18.2.2. (aka Cisco phone fix) (Closes issue #18951. Reported by jmls. Patched by wdoekes) - Resolve a change in IPv6 header parsing due to the Cisco phone fix issue. This issue was found and reported by the Asterisk test suite. (Closes issue #18951. Patched by mnicholson) - Resolve potential crash when using SIP TLS support. (Closes issue #19192. Reported by stknob. Patched by Chainsaw. Tested by vois, Chainsaw) - Improve reliability when using SIP TLS. (Closes issue #19182. Reported by st. Patched by mnicholson) For a full list of changes in this release candidate, please see the ChangeLog : http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-1.8.4.1 The Asterisk Development Team has announced the release of Asterisk 1.8.4. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/ The release of Asterisk 1.8.4 resolves several issues reported by the community. Without your help this release would not have been possible. Thank you! Below is a sample of the issues resolved in this release : - Use SSLv23_client_method instead of old SSLv2 only. (Closes issue #19095, #19138. Reported, patched by tzafrir. Tested by russell and chazzam. - Resolve crash in ast_mutex_init() (Patched by twilson) - Resolution of several DTMF based attended transfer issues. (Closes issue #17999, #17096, #18395, #17273. Reported by iskatel, gelo, shihchuan, grecco. Patched by rmudgett) NOTE: Be sure to read the ChangeLog for more information about these changes. - Resolve deadlocks related to device states in chan_sip (Closes issue #18310. Reported, patched by one47. Patched by jpeeler) - Resolve an issue with the Asterisk manager interface leaking memory when disabled. (Reported internally by kmorgan. Patched by russellb) - Support greetingsfolder as documented in voicemail.conf.sample. (Closes issue #17870. Reported by edhorton. Patched by seanbright) - Fix channel redirect out of MeetMe() and other issues with channel softhangup (Closes issue #18585. Reported by oej. Tested by oej, wedhorn, russellb. Patched by russellb) - Fix voicemail sequencing for file based storage. (Closes issue #18498, #18486. Reported by JJCinAZ, bluefox. Patched by jpeeler) - Set hangup cause in local_hangup so the proper return code of 486 instead of 503 when using Local channels when the far sides returns a busy. Also affects CCSS in Asterisk 1.8+. (Patched by twilson) - Fix issues with verbose messages not being output to the console. (Closes issue #18580. Reported by pabelanger. Patched by qwell) - Fix Deadlock with attended transfer of SIP call (Closes issue #18837. Reported, patched by alecdavis. Tested by alecdavid, Irontec, ZX81, cmaj) Includes changes per AST-2011-005 and AST-2011-006 For a full list of changes in this release candidate, please see the ChangeLog : http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-1.8.4 Information about the security releases are available at : http://downloads.asterisk.org/pub/security/AST-2011-005.pdf http://downloads.asterisk.org/pub/security/AST-2011-006.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. last seen 2020-06-01 modified 2020-06-02 plugin id 55425 published 2011-06-27 reporter This script is Copyright (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/55425 title Fedora 15 : asterisk-1.8.4.2-1.fc15.1 (2011-8319) NASL family Fedora Local Security Checks NASL id FEDORA_2011-8983.NASL description Remove systemd dependencies from EL6 and F15 The Asterisk Development Team has announced the release of Asterisk versions 1.4.41.2, 1.6.2.18.2, and 1.8.4.4, which are security releases. These releases are available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases The release of Asterisk 1.4.41.2, 1.6.2.18.2, and 1.8.4.4 resolves the following issue : AST-2011-011: Asterisk may respond differently to SIP requests from an invalid SIP user than it does to a user configured on the system, even when the alwaysauthreject option is set in the configuration. This can leak information about what SIP users are valid on the Asterisk system. For more information about the details of this vulnerability, please read the security advisory AST-2011-011, which was released at the same time as this announcement. For a full list of changes in the current releases, please see the ChangeLog : http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.4.41.2 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.6.2.18.2 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.4.4 Security advisory AST-2011-011 is available at : http://downloads.asterisk.org/pub/security/AST-2011-011.pdf The Asterisk Development Team has announced the release of Asterisk versions 1.4.41.1, 1.6.2.18.1, and 1.8.4.3, which are security releases. These releases are available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases The release of Asterisk 1.4.41.1, 1.6.2.18, and 1.8.4.3 resolves several issues as outlined below : - AST-2011-008: If a remote user sends a SIP packet containing a null, Asterisk assumes available data extends past the null to the end of the packet when the buffer is actually truncated when copied. This causes SIP header parsing to modify data past the end of the buffer altering unrelated memory structures. This vulnerability does not affect TCP/TLS connections. -- Resolved in 1.6.2.18.1 and 1.8.4.3 - AST-2011-009: A remote user sending a SIP packet containing a Contact header with a missing left angle bracket (<) causes Asterisk to access a NULL pointer. -- Resolved in 1.8.4.3 - AST-2011-010: A memory address was inadvertently transmitted over the network via IAX2 via an option control frame and the remote party would try to access it. -- Resolved in 1.4.41.1, 1.6.2.18.1, and 1.8.4.3 The issues and resolutions are described in the AST-2011-008, AST-2011-009, and AST-2011-010 security advisories. For more information about the details of these vulnerabilities, please read the security advisories AST-2011-008, AST-2011-009, and AST-2011-010, which were released at the same time as this announcement. For a full list of changes in the current releases, please see the ChangeLog : http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.4.41.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.6.2.18.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.4.3 Security advisories AST-2011-008, AST-2011-009, and AST-2011-010 are available at : http://downloads.asterisk.org/pub/security/AST-2011-008.pdf http://downloads.asterisk.org/pub/security/AST-2011-009.pdf http://downloads.asterisk.org/pub/security/AST-2011-010.pdf The Asterisk Development Team has announced the release of Asterisk version 1.8.4.2, which is a security release for Asterisk 1.8. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases The release of Asterisk 1.8.4.2 resolves an issue with SIP URI parsing which can lead to a remotely exploitable crash : Remote Crash Vulnerability in SIP channel driver (AST-2011-007) The issue and resolution is described in the AST-2011-007 security advisory. For more information about the details of this vulnerability, please read the security advisory AST-2011-007, which was released at the same time as this announcement. For a full list of changes in the current release, please see the ChangeLog : http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.4.2 Security advisory AST-2011-007 is available at : http://downloads.asterisk.org/pub/security/AST-2011-007.pdf The Asterisk Development Team has announced the release of Asterisk 1.8.4.1. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/ The release of Asterisk 1.8.4.1 resolves several issues reported by the community. Without your help this release would not have been possible. Thank you! Below is a list of issues resolved in this release : - Fix our compliance with RFC 3261 section 18.2.2. (aka Cisco phone fix) (Closes issue #18951. Reported by jmls. Patched by wdoekes) - Resolve a change in IPv6 header parsing due to the Cisco phone fix issue. This issue was found and reported by the Asterisk test suite. (Closes issue #18951. Patched by mnicholson) - Resolve potential crash when using SIP TLS support. (Closes issue #19192. Reported by stknob. Patched by Chainsaw. Tested by vois, Chainsaw) - Improve reliability when using SIP TLS. (Closes issue #19182. Reported by st. Patched by mnicholson) For a full list of changes in this release candidate, please see the ChangeLog : http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-1.8.4.1 The Asterisk Development Team has announced the release of Asterisk 1.8.4. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/ The release of Asterisk 1.8.4 resolves several issues reported by the community. Without your help this release would not have been possible. Thank you! Below is a sample of the issues resolved in this release : - Use SSLv23_client_method instead of old SSLv2 only. (Closes issue #19095, #19138. Reported, patched by tzafrir. Tested by russell and chazzam. - Resolve crash in ast_mutex_init() (Patched by twilson) - Resolution of several DTMF based attended transfer issues. (Closes issue #17999, #17096, #18395, #17273. Reported by iskatel, gelo, shihchuan, grecco. Patched by rmudgett) NOTE: Be sure to read the ChangeLog for more information about these changes. - Resolve deadlocks related to device states in chan_sip (Closes issue #18310. Reported, patched by one47. Patched by jpeeler) - Resolve an issue with the Asterisk manager interface leaking memory when disabled. (Reported internally by kmorgan. Patched by russellb) - Support greetingsfolder as documented in voicemail.conf.sample. (Closes issue #17870. Reported by edhorton. Patched by seanbright) - Fix channel redirect out of MeetMe() and other issues with channel softhangup (Closes issue #18585. Reported by oej. Tested by oej, wedhorn, russellb. Patched by russellb) - Fix voicemail sequencing for file based storage. (Closes issue #18498, #18486. Reported by JJCinAZ, bluefox. Patched by jpeeler) - Set hangup cause in local_hangup so the proper return code of 486 instead of 503 when using Local channels when the far sides returns a busy. Also affects CCSS in Asterisk 1.8+. (Patched by twilson) - Fix issues with verbose messages not being output to the console. (Closes issue #18580. Reported by pabelanger. Patched by qwell) - Fix Deadlock with attended transfer of SIP call (Closes issue #18837. Reported, patched by alecdavis. Tested by alecdavid, Irontec, ZX81, cmaj) Includes changes per AST-2011-005 and AST-2011-006 For a full list of changes in this release candidate, please see the ChangeLog : http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-1.8.4 Information about the security releases are available at : http://downloads.asterisk.org/pub/security/AST-2011-005.pdf http://downloads.asterisk.org/pub/security/AST-2011-006.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. last seen 2020-06-01 modified 2020-06-02 plugin id 55582 published 2011-07-13 reporter This script is Copyright (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/55582 title Fedora 15 : asterisk-1.8.4.4-2.fc15 (2011-8983) NASL family Denial of Service NASL id ASTERISK_AST_2011_007.NASL description According to the version in its SIP banner, the version of Asterisk running on the remote host is 1.8.x prior to 1.8.4.2. It, therefore, could be affected by a denial of service vulnerability. If a remote attacker initiates a SIP call and the recipient picks up, the remote user can reply with a malformed Contact header that will cause Asterisk to crash. last seen 2020-06-01 modified 2020-06-02 plugin id 54971 published 2011-06-05 reporter This script is Copyright (C) 2011-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/54971 title Asterisk SIP Channel Driver Denial of Service (AST-2011-007)
References
- http://downloads.digium.com/pub/security/AST-2011-007.html
- http://lists.fedoraproject.org/pipermail/package-announce/2011-July/062658.html
- http://lists.fedoraproject.org/pipermail/package-announce/2011-June/062013.html
- http://osvdb.org/72752
- http://secunia.com/advisories/44828
- http://securitytracker.com/id?1025598
- http://www.securityfocus.com/archive/1/518236/100/0/threaded
- http://www.securityfocus.com/bid/48096
- https://exchange.xforce.ibmcloud.com/vulnerabilities/67812