__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Asterisk [Debian Security Advisory DSA-1525-1] March 27, 2008 19:00 GMT Number S-240 ______________________________________________________________________________ PROBLEM: Several remote vulnerabilities have been discovered in Asterisk, a free software PBX and telephony toolkit. PLATFORM: Debian GNU/Linux 4.0 (stable) DAMAGE: Authentication bypass and the potential external initiation of calls. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is LOW. Insufficient validation of From: headers ASSESSMENT: inside the SIP channel driver may lead to authentication bypass and the potential external initiation of calls. ______________________________________________________________________________ CVSS 2 BASE SCORE: 6.4 TEMPORAL SCORE: 5.3 VECTOR: (AV:N/AC:L/Au:N/C:N/I:P/A:P/E:F/RL:OF/RC:C) ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/s-240.shtml ORIGINAL BULLETIN: http://www.debian.org/security/2008/dsa-1525 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-6430 CVE-2008-1332 CVE-2008-1333 ______________________________________________________________________________ [***** Start Debian Security Advisory DSA-1525-1 *****] Debian Security Advisory DSA-1525-1 asterisk -- several vulnerabilities Date Reported: 20 Mar 2008 Affected Packages: asterisk Vulnerable: Yes Security database references: In Mitre's CVE dictionary: CVE-2007-6430, CVE-2008-1332, CVE-2008-1333. More information: Several remote vulnerabilities have been discovered in Asterisk, a free software PBX and telephony toolkit. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2007-6430 Tilghman Lesher discovered that database-based registrations are insufficiently validated. This only affects setups, which are configured to run without a password and only host-based authentication. CVE-2008-1332 Jason Parker discovered that insufficient validation of From: headers inside the SIP channel driver may lead to authentication bypass and the potential external initiation of calls. CVE-2008-1333 This update also fixes a format string vulnerability, which can only be triggered through configuration files under control of the local administrator. In later releases of Asterisk this issue is remotely exploitable and tracked as CVE-2008-1333. The status of the old stable distribution (sarge) is currently being investigated. If affected, an update will be released through security.debian.org. For the stable distribution (etch), these problems have been fixed in version 1:1.2.13~dfsg-2etch3. We recommend that you upgrade your asterisk packages. Fixed in: Debian GNU/Linux 4.0 (stable) Source: http://security.debian.org/pool/updates/main/a/asterisk/asterisk_1.2.13~dfsg-2etch3.diff.gz http://security.debian.org/pool/updates/main/a/asterisk/asterisk_1.2.13~dfsg.orig.tar.gz http://security.debian.org/pool/updates/main/a/asterisk/asterisk_1.2.13~dfsg-2etch3.dsc Architecture-independent component: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-doc_1.2.13~dfsg-2etch3_all.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-sounds-main_1.2.13~dfsg-2etch3_all.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-config_1.2.13~dfsg-2etch3_all.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-web-vmail_1.2.13~dfsg-2etch3_all.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-dev_1.2.13~dfsg-2etch3_all.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk_1.2.13~dfsg-2etch3_all.deb Alpha: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_alpha.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_alpha.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_alpha.deb AMD64: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_amd64.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_amd64.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_amd64.deb ARM: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_arm.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_arm.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_arm.deb HP Precision: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_hppa.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_hppa.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_hppa.deb Intel IA-32: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_i386.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_i386.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_i386.deb Intel IA-64: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_ia64.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_ia64.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_ia64.deb Big-endian MIPS: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_mips.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_mips.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_mips.deb Little-endian MIPS: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_mipsel.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_mipsel.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_mipsel.deb PowerPC: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_powerpc.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_powerpc.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_powerpc.deb IBM S/390: http://security.debian.org/pool/updates/main/a/asterisk/asterisk-classic_1.2.13~dfsg-2etch3_s390.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-bristuff_1.2.13~dfsg-2etch3_s390.deb http://security.debian.org/pool/updates/main/a/asterisk/asterisk-h323_1.2.13~dfsg-2etch3_s390.deb MD5 checksums of the listed files are available in the original advisory. [***** End Debian Security Advisory DSA-1525-1 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Debian for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. 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