The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a database and tools to fix them.

Computer vulnerabilities of RealPresence Distributed Media Application

vulnerability CVE-2015-0235

glibc: buffer overflow of gethostbyname, GHOST

Synthesis of the vulnerability

An attacker can for example send an email using a long IPv4 address, to force the messaging server to resolve this address, and to generate a buffer overflow in gethostbyname() of the glibc, in order to trigger a denial of service, and possibly to execute code. Several programs using the gethostbyname() function are vulnerable with a similar attack vector.
Impacted products: Arkoon FAST360, GAiA, CheckPoint IP Appliance, Provider-1, SecurePlatform, CheckPoint Security Gateway, CheckPoint VSX-1, Cisco ASR, Cisco Catalyst, IOS XE Cisco, IOS XR Cisco, Nexus by Cisco, NX-OS, Prime Infrastructure, Cisco CUCM, XenServer, Clearswift Email Gateway, Debian, Unisphere EMC, VNX Operating Environment, VNX Series, Exim, BIG-IP Hardware, TMOS, HPE BSM, HP Operations, Performance Center, Junos Space, McAfee Email and Web Security, McAfee Email Gateway, McAfee MOVE AntiVirus, McAfee NSP, McAfee NTBA, McAfee NGFW, VirusScan, McAfee Web Gateway, openSUSE, Oracle Communications, Palo Alto Firewall PA***, PAN-OS, PHP, HDX, RealPresence Collaboration Server, RealPresence Distributed Media Application, RealPresence Resource Manager, Polycom VBP, RHEL, SIMATIC, Slackware, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Ubuntu, Unix (platform) ~ not comprehensive, WordPress Core.
Severity: 4/4.
Consequences: user access/rights, denial of service on client.
Provenance: internet server.
Creation date: 27/01/2015.
Revision date: 27/01/2015.
Identifiers: 198850, 199399, c04577814, c04589512, CERTFR-2015-AVI-043, cisco-sa-20150128-ghost, cpujul2015, cpujul2017, cpuoct2016, cpuoct2017, cpuoct2018, CTX200437, CVE-2015-0235, DSA-3142-1, ESA-2015-030, ESA-2015-041, GHOST, HPSBGN03270, HPSBGN03285, JSA10671, K16057, KM01391662, MDVSA-2015:039, openSUSE-SU-2015:0162-1, openSUSE-SU-2015:0184-1, PAN-SA-2015-0002, RHSA-2015:0090-01, RHSA-2015:0092-01, RHSA-2015:0099-01, RHSA-2015:0101-01, RHSA-2015:0126-01, SB10100, sk104443, SOL16057, SSA:2015-028-01, SSA-994726, SUSE-SU-2015:0158-1, USN-2485-1, VIGILANCE-VUL-16060, VU#967332.

Description of the vulnerability

The glibc library provides two functions to obtain the IP address of a server from its DNS name:
  struct hostent *gethostbyname(const char *name);
  struct hostent *gethostbyname2(const char *name, int af);

For example:
  he = gethostbyname("www.example.com");

These functions also accept to directly process an IP address:
  he = gethostbyname("192.168.1.1");

However, a malformed IPv4 address, which is too long such as 192.168.111111.1 (more than 1024 byte long) triggers an overflow in the __nss_hostname_digits_dots() function.

An attacker can therefore for example send an email using a long IPv4 address, to force the messaging server to resolve this address, and to generate a buffer overflow in gethostbyname() of the glibc, in order to trigger a denial of service, and possibly to execute code.

Several programs using the gethostbyname() function are vulnerable (exim, php, pppd, procmail) with a similar attack vector. The following programs are apparently not vulnerable: apache, cups, dovecot, gnupg, isc-dhcp, lighttpd, mariadb/mysql, nfs-utils, nginx, nodejs, openldap, openssh, postfix, proftpd, pure-ftpd, rsyslog, samba, sendmail, squid, sysklogd, syslog-ng, tcp_wrappers, vsftpd, xinetd.
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computer vulnerability CVE-2014-3566

SSL 3.0: decrypting session, POODLE

Synthesis of the vulnerability

An attacker, located as a Man-in-the-Middle, can decrypt a SSL 3.0 session, in order to obtain sensitive information.
Impacted products: SES, SNS, Apache httpd, Arkoon FAST360, ArubaOS, Asterisk Open Source, BES, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Security Gateway, Cisco ASR, Cisco ACE, ASA, AsyncOS, Cisco CSS, Cisco ESA, IOS by Cisco, IOS XE Cisco, IOS XR Cisco, IronPort Email, Nexus by Cisco, NX-OS, Prime Infrastructure, Cisco PRSM, Cisco Router, WebNS, Clearswift Email Gateway, Clearswift Web Gateway, CUPS, Debian, Black Diamond, ExtremeXOS, Summit, BIG-IP Hardware, TMOS, Fedora, FortiGate, FortiGate Virtual Appliance, FortiManager, FortiManager Virtual Appliance, FortiOS, FreeBSD, F-Secure AV, hMailServer, HPE BSM, HP Data Protector, HPE NNMi, HP Operations, ProCurve Switch, SiteScope, HP Switch, TippingPoint IPS, HP-UX, AIX, Domino, Notes, Security Directory Server, SPSS Data Collection, Tivoli System Automation, Tivoli Workload Scheduler, WebSphere AS Traditional, WebSphere MQ, IVE OS, Juniper J-Series, Junos OS, Junos Space, Junos Space Network Management Platform, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, McAfee Email and Web Security, McAfee Email Gateway, ePO, VirusScan, McAfee Web Gateway, IE, Windows 2003, Windows 2008 R0, Windows 2008 R2, Windows 2012, Windows 7, Windows 8, Windows (platform) ~ not comprehensive, Windows RT, Windows Vista, NETASQ, NetBSD, NetScreen Firewall, ScreenOS, nginx, Nodejs Core, OpenSSL, openSUSE, openSUSE Leap, Oracle DB, Oracle Fusion Middleware, Oracle Identity Management, Oracle OIT, Solaris, Tuxedo, WebLogic, Palo Alto Firewall PA***, PAN-OS, Polycom CMA, HDX, RealPresence Collaboration Server, RealPresence Distributed Media Application, Polycom VBP, Postfix, SSL protocol, Puppet, RHEL, JBoss EAP by Red Hat, RSA Authentication Manager, ROS, ROX, RuggedSwitch, Slackware, Splunk Enterprise, stunnel, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Ubuntu, Unix (platform) ~ not comprehensive, ESXi, vCenter Server, VMware vSphere, VMware vSphere Hypervisor, WinSCP.
Severity: 3/4.
Consequences: data reading, data creation/edition.
Provenance: internet client.
Creation date: 15/10/2014.
Identifiers: 10923, 1589583, 1595265, 1653364, 1657963, 1663874, 1687167, 1687173, 1687433, 1687604, 1687611, 1690160, 1690185, 1690342, 1691140, 1692551, 1695392, 1696383, 1699051, 1700706, 2977292, 3009008, 7036319, aid-10142014, AST-2014-011, bulletinapr2015, bulletinjan2015, bulletinjan2016, bulletinjul2015, bulletinjul2016, bulletinoct2015, c04486577, c04487990, c04492722, c04497114, c04506802, c04510230, c04567918, c04616259, c04626982, c04676133, c04776510, CERTFR-2014-ALE-007, CERTFR-2014-AVI-454, CERTFR-2014-AVI-509, CERTFR-2015-AVI-169, CERTFR-2016-AVI-303, cisco-sa-20141015-poodle, cpujul2017, CTX216642, CVE-2014-3566, DSA-3053-1, DSA-3253-1, DSA-3489-1, ESA-2014-178, ESA-2015-098, ESXi500-201502001, ESXi500-201502101-SG, ESXi510-201503001, ESXi510-201503001-SG, ESXi510-201503101-SG, ESXi550-201501001, ESXi550-201501101-SG, FEDORA-2014-12989, FEDORA-2014-12991, FEDORA-2014-13012, FEDORA-2014-13017, FEDORA-2014-13040, FEDORA-2014-13069, FEDORA-2014-13070, FEDORA-2014-13444, FEDORA-2014-13451, FEDORA-2014-13764, FEDORA-2014-13777, FEDORA-2014-13781, FEDORA-2014-13794, FEDORA-2014-14234, FEDORA-2014-14237, FEDORA-2014-15379, FEDORA-2014-15390, FEDORA-2014-15411, FEDORA-2014-17576, FEDORA-2014-17587, FEDORA-2015-9090, FEDORA-2015-9110, FreeBSD-SA-14:23.openssl, FSC-2014-8, HPSBGN03256, HPSBGN03305, HPSBGN03332, HPSBHF03156, HPSBHF03300, HPSBMU03152, HPSBMU03184, HPSBMU03213, HPSBMU03416, HPSBUX03162, HPSBUX03194, JSA10656, MDVSA-2014:203, MDVSA-2014:218, MDVSA-2015:062, NetBSD-SA2014-015, nettcp_advisory, openSUSE-SU-2014:1331-1, openSUSE-SU-2014:1384-1, openSUSE-SU-2014:1395-1, openSUSE-SU-2014:1426-1, openSUSE-SU-2016:0640-1, openSUSE-SU-2016:1586-1, openSUSE-SU-2017:0980-1, PAN-SA-2014-0005, POODLE, RHSA-2014:1652-01, RHSA-2014:1653-01, RHSA-2014:1692-01, RHSA-2014:1920-01, RHSA-2014:1948-01, RHSA-2015:0010-01, RHSA-2015:0011-01, RHSA-2015:0012-01, RHSA-2015:1545-01, RHSA-2015:1546-01, SA83, SB10090, SB10104, sk102989, SOL15702, SP-CAAANKE, SP-CAAANST, SPL-91947, SPL-91948, SSA:2014-288-01, SSA-396873, SSA-472334, SSRT101767, STORM-2014-02-FR, SUSE-SU-2014:1357-1, SUSE-SU-2014:1361-1, SUSE-SU-2014:1386-1, SUSE-SU-2014:1387-1, SUSE-SU-2014:1387-2, SUSE-SU-2014:1409-1, SUSE-SU-2015:0010-1, SUSE-SU-2016:1457-1, SUSE-SU-2016:1459-1, T1021439, TSB16540, USN-2839-1, VIGILANCE-VUL-15485, VMSA-2015-0001, VMSA-2015-0001.1, VMSA-2015-0001.2, VN-2014-003, VU#577193.

Description of the vulnerability

An SSL/TLS session can be established using several protocols:
 - SSL 2.0 (obsolete)
 - SSL 3.0
 - TLS 1.0
 - TLS 1.1
 - TLS 1.2

An attacker can downgrade the version to SSLv3. However, with SSL 3.0, an attacker can change the padding position with a CBC encryption, in order to progressively guess clear text fragments.

This vulnerability is named POODLE (Padding Oracle On Downgraded Legacy Encryption).

An attacker, located as a Man-in-the-Middle, can therefore decrypt a SSL 3.0 session, in order to obtain sensitive information.
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vulnerability CVE-2014-6277

bash: memory corruption in the function parser

Synthesis of the vulnerability

An attacker can define a special environment variable, which is transmitted (via CGI or OpenSSH for example) to bash, in order to execute code.
Impacted products: GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Smart-1, CheckPoint VSX-1, XenServer, Clearswift Email Gateway, Clearswift Web Gateway, Avamar, EMC CAVA, EMC CEE, EMC CEPA, Celerra FAST, Celerra NS, Celerra NX4, EMC CMDCE, Connectrix Switch, NetWorker, PowerPath, Unisphere EMC, VNX Operating Environment, VNX Series, BIG-IP Hardware, TMOS, HP Operations, AIX, IVE OS, Junos Space, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, Juniper UAC, McAfee Email and Web Security, McAfee Email Gateway, McAfee MOVE AntiVirus, McAfee NSP, McAfee NGFW, McAfee Web Gateway, openSUSE, openSUSE Leap, Solaris, RealPresence Collaboration Server, RealPresence Distributed Media Application, Polycom VBP, RSA Authentication Manager, ROX, RuggedSwitch, Slackware, Stonesoft NGFW/VPN, Ubuntu, Unix (platform) ~ not comprehensive, ESX, vCenter Server, VMware vSphere.
Severity: 3/4.
Consequences: user access/rights, denial of service on service, denial of service on client.
Provenance: internet client.
Creation date: 29/09/2014.
Identifiers: 193355, 193866, 194029, 194064, 194669, 480931, c04475942, c04479492, CERTFR-2014-AVI-403, CERTFR-2014-AVI-415, CERTFR-2014-AVI-480, CTX200217, CTX200223, CVE-2014-6277, ESA-2014-111, ESA-2014-123, ESA-2014-124, ESA-2014-125, ESA-2014-126, ESA-2014-127, ESA-2014-128, ESA-2014-133, ESA-2014-136, ESA-2014-150, ESA-2014-151, ESA-2014-152, ESA-2014-162, HPSBGN03138, HPSBMU03144, JSA10648, JSA10661, MDVSA-2015:164, openSUSE-SU-2014:1310-1, openSUSE-SU-2016:2961-1, SB10085, sk102673, SOL15629, SSA:2014-272-01, SSA-860967, T1021272, USN-2380-1, VIGILANCE-VUL-15420, VMSA-2014-0010, VMSA-2014-0010.10, VMSA-2014-0010.11, VMSA-2014-0010.12, VMSA-2014-0010.13, VMSA-2014-0010.2, VMSA-2014-0010.4, VMSA-2014-0010.7, VMSA-2014-0010.8, VMSA-2014-0010.9.

Description of the vulnerability

The bash interpreter can use functions.

However, when bash parses the source code to create the function, it corrupts its memory.

This vulnerability can be used with the same attack vector than VIGILANCE-VUL-15399.

An attacker can therefore define a special environment variable, which is transmitted (via CGI or OpenSSH for example) to bash, in order to execute code.
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computer vulnerability note CVE-2014-7186 CVE-2014-7187

bash: two denial of service

Synthesis of the vulnerability

An attacker can use several vulnerabilities of bash.
Impacted products: GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Smart-1, CheckPoint VSX-1, XenServer, Clearswift Email Gateway, Clearswift Web Gateway, Avamar, EMC CAVA, EMC CEE, EMC CEPA, Celerra FAST, Celerra NS, Celerra NX4, EMC CMDCE, Connectrix Switch, NetWorker, PowerPath, Unisphere EMC, VNX Operating Environment, VNX Series, BIG-IP Hardware, TMOS, HP Operations, AIX, IVE OS, Junos Space, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, Juniper UAC, McAfee Email and Web Security, McAfee Email Gateway, McAfee MOVE AntiVirus, McAfee NSP, McAfee NGFW, McAfee Web Gateway, openSUSE, Solaris, RealPresence Collaboration Server, RealPresence Distributed Media Application, Polycom VBP, RHEL, RSA Authentication Manager, ROX, RuggedSwitch, Stonesoft NGFW/VPN, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform) ~ not comprehensive, ESX, vCenter Server, VMware vSphere.
Severity: 1/4.
Consequences: denial of service on service.
Provenance: document.
Number of vulnerabilities in this bulletin: 2.
Creation date: 29/09/2014.
Identifiers: 193355, 193866, 194029, 194064, 194669, 480931, c04475942, c04479492, CERTFR-2014-AVI-403, CERTFR-2014-AVI-415, CERTFR-2014-AVI-480, CTX200217, CTX200223, CVE-2014-7186, CVE-2014-7187, ESA-2014-111, ESA-2014-123, ESA-2014-124, ESA-2014-125, ESA-2014-126, ESA-2014-127, ESA-2014-128, ESA-2014-133, ESA-2014-136, ESA-2014-150, ESA-2014-151, ESA-2014-152, ESA-2014-162, HPSBGN03138, HPSBMU03144, JSA10648, JSA10661, MDVSA-2015:164, openSUSE-SU-2014:1229-1, openSUSE-SU-2014:1242-1, openSUSE-SU-2014:1248-1, openSUSE-SU-2014:1308-1, openSUSE-SU-2014:1310-1, RHSA-2014:1311-01, RHSA-2014:1312-01, RHSA-2014:1354-01, RHSA-2014:1865-01, SB10085, sk102673, SOL15629, SSA-860967, SUSE-SU-2014:1247-1, SUSE-SU-2014:1247-2, T1021272, USN-2364-1, VIGILANCE-VUL-15419, VMSA-2014-0010, VMSA-2014-0010.10, VMSA-2014-0010.11, VMSA-2014-0010.12, VMSA-2014-0010.13, VMSA-2014-0010.2, VMSA-2014-0010.4, VMSA-2014-0010.7, VMSA-2014-0010.8, VMSA-2014-0010.9.

Description of the vulnerability

Several vulnerabilities were announced in bash.

An attacker can force a read at an invalid address in redir_stack, in order to trigger a denial of service. [severity:1/4; CVE-2014-7186]

An attacker can generate a buffer overflow of one byte in word_lineno, in order to trigger a denial of service, and possibly to execute code. [severity:1/4; CVE-2014-7187]
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vulnerability alert CVE-2014-7169

bash: code execution via Function Variable

Synthesis of the vulnerability

An attacker can define a special environment variable, which is transmitted (via CGI or OpenSSH for example) to bash, in order to execute code.
Impacted products: Arkoon FAST360, GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Smart-1, CheckPoint VSX-1, Cisco ASR, Cisco ACE, ASA, IOS XE Cisco, Cisco IPS, IronPort Encryption, Nexus by Cisco, NX-OS, Secure ACS, Cisco CUCM, Cisco Unified CCX, XenServer, Clearswift Email Gateway, Clearswift Web Gateway, Debian, Avamar, EMC CAVA, EMC CEE, EMC CEPA, Celerra FAST, Celerra NS, Celerra NX4, EMC CMDCE, Connectrix Switch, NetWorker, PowerPath, Unisphere EMC, VNX Operating Environment, VNX Series, Black Diamond, ExtremeXOS, Summit, BIG-IP Hardware, TMOS, Fedora, FortiAnalyzer, FortiAnalyzer Virtual Appliance, FortiManager, FortiManager Virtual Appliance, HP Operations, AIX, IVE OS, Junos Space, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, Juniper UAC, McAfee Email and Web Security, McAfee Email Gateway, McAfee MOVE AntiVirus, McAfee NSP, McAfee NGFW, McAfee Web Gateway, openSUSE, Solaris, pfSense, RealPresence Collaboration Server, RealPresence Distributed Media Application, Polycom VBP, RHEL, RSA Authentication Manager, ROX, RuggedSwitch, Slackware, Stonesoft NGFW/VPN, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform) ~ not comprehensive, ESX, vCenter Server, VMware vSphere.
Severity: 3/4.
Consequences: administrator access/rights, privileged access/rights, user access/rights.
Provenance: internet client.
Number of vulnerabilities in this bulletin: 2.
Creation date: 25/09/2014.
Identifiers: 193355, 193866, 194029, 194064, 194669, 480931, c04475942, c04479492, CERTFR-2014-AVI-403, CERTFR-2014-AVI-415, CERTFR-2014-AVI-480, cisco-sa-20140926-bash, CTX200217, CTX200223, CVE-2014-3659-REJECT, CVE-2014-7169, DSA-3035-1, ESA-2014-111, ESA-2014-123, ESA-2014-124, ESA-2014-125, ESA-2014-126, ESA-2014-127, ESA-2014-128, ESA-2014-133, ESA-2014-136, ESA-2014-150, ESA-2014-151, ESA-2014-152, ESA-2014-162, FEDORA-2014-11514, FEDORA-2014-11527, FEDORA-2014-12202, FG-IR-14-030, HPSBGN03138, HPSBMU03144, JSA10648, JSA10661, MDVSA-2014:190, MDVSA-2015:164, openSUSE-SU-2014:1229-1, openSUSE-SU-2014:1242-1, openSUSE-SU-2014:1248-1, openSUSE-SU-2014:1308-1, openSUSE-SU-2014:1310-1, pfSense-SA-14_18.packages, RHSA-2014:1306-01, RHSA-2014:1311-01, RHSA-2014:1312-01, RHSA-2014:1354-01, RHSA-2014:1865-01, SB10085, sk102673, SOL15629, SSA:2014-268-01, SSA:2014-268-02, SSA-860967, SUSE-SU-2014:1247-1, SUSE-SU-2014:1247-2, T1021272, USN-2363-1, USN-2363-2, VIGILANCE-VUL-15401, VMSA-2014-0010, VMSA-2014-0010.10, VMSA-2014-0010.11, VMSA-2014-0010.12, VMSA-2014-0010.13, VMSA-2014-0010.2, VMSA-2014-0010.4, VMSA-2014-0010.7, VMSA-2014-0010.8, VMSA-2014-0010.9, VN-2014-002.

Description of the vulnerability

The bulletin VIGILANCE-VUL-15399 describes a vulnerability of bash.

However, the offered patch (VIGILANCE-SOL-36695) is incomplete. An variant of the initial attack can thus still be used to execute code or to create a file.

In this case, the code is run when the variable is parsed (which is not necessarily an environment variable), and not when the shell starts. The impact may thus be lower, but this was not confirmed.

An attacker can therefore define a special environment variable, which is transmitted (via CGI or OpenSSH for example) to bash, in order to execute code.
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computer vulnerability note CVE-2014-6271

bash: code execution via Environment Variable, ShellShock

Synthesis of the vulnerability

An attacker can define a special environment variable, which is transmitted (via CGI or OpenSSH for example) to bash, in order to execute code.
Impacted products: Arkoon FAST360, GAiA, CheckPoint IP Appliance, IPSO, SecurePlatform, CheckPoint Security Appliance, CheckPoint Smart-1, CheckPoint VSX-1, Cisco ASR, Cisco ACE, ASA, IOS XE Cisco, Cisco IPS, IronPort Encryption, Nexus by Cisco, NX-OS, Secure ACS, Cisco CUCM, Cisco Unified CCX, XenServer, Clearswift Email Gateway, Clearswift Web Gateway, Debian, Avamar, EMC CAVA, EMC CEE, EMC CEPA, Celerra FAST, Celerra NS, Celerra NX4, EMC CMDCE, Connectrix Switch, NetWorker, PowerPath, Unisphere EMC, VNX Operating Environment, VNX Series, Black Diamond, ExtremeXOS, Summit, BIG-IP Hardware, TMOS, Fedora, FortiAnalyzer, FortiAnalyzer Virtual Appliance, FortiManager, FortiManager Virtual Appliance, HP Operations, AIX, IVE OS, Junos Space, MAG Series by Juniper, NSM Central Manager, NSMXpress, Juniper SA, Juniper UAC, McAfee Email and Web Security, McAfee Email Gateway, McAfee MOVE AntiVirus, McAfee NSP, McAfee NGFW, McAfee Web Gateway, openSUSE, Solaris, pfSense, RealPresence Collaboration Server, RealPresence Distributed Media Application, Polycom VBP, RHEL, RSA Authentication Manager, ROX, RuggedSwitch, Slackware, Stonesoft NGFW/VPN, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform) ~ not comprehensive, ESX, vCenter Server, VMware vSphere.
Severity: 4/4.
Consequences: administrator access/rights, privileged access/rights, user access/rights.
Provenance: internet client.
Creation date: 24/09/2014.
Identifiers: 1141597, 193355, 193866, 194029, 194064, 194669, 480931, c04475942, c04479492, CERTFR-2014-ALE-006, CERTFR-2014-AVI-403, CERTFR-2014-AVI-415, CERTFR-2014-AVI-480, cisco-sa-20140926-bash, CTX200217, CTX200223, CVE-2014-6271, DSA-3032-1, ESA-2014-111, ESA-2014-123, ESA-2014-124, ESA-2014-125, ESA-2014-126, ESA-2014-127, ESA-2014-128, ESA-2014-133, ESA-2014-136, ESA-2014-150, ESA-2014-151, ESA-2014-152, ESA-2014-162, FEDORA-2014-11360, FEDORA-2014-11503, FG-IR-14-030, HPSBGN03138, HPSBMU03144, JSA10648, JSA10661, MDVSA-2014:186, MDVSA-2015:164, openSUSE-SU-2014:1226-1, openSUSE-SU-2014:1238-1, openSUSE-SU-2014:1308-1, openSUSE-SU-2014:1310-1, pfSense-SA-14_18.packages, RHSA-2014:1293-01, RHSA-2014:1294-01, RHSA-2014:1295-01, RHSA-2014:1354-01, SB10085, ShellShock, sk102673, SOL15629, SSA:2014-267-01, SSA-860967, SUSE-SU-2014:1212-1, SUSE-SU-2014:1213-1, SUSE-SU-2014:1214-1, SUSE-SU-2014:1223-1, T1021272, USN-2362-1, VIGILANCE-VUL-15399, VMSA-2014-0010, VMSA-2014-0010.10, VMSA-2014-0010.11, VMSA-2014-0010.12, VMSA-2014-0010.13, VMSA-2014-0010.2, VMSA-2014-0010.4, VMSA-2014-0010.7, VMSA-2014-0010.8, VMSA-2014-0010.9, VN-2014-002, VU#252743.

Description of the vulnerability

When bash interpreter is started, environment variables of the parent process are transfered to the current process. For example:
  export A=test
  bash
  echo $A

Functions can also be transfered through environment variables. For example:
  export F='() { echo bonjour; }'
  bash
  F

However, bash loads functions by interpreting the full environment variable. If an environment variable starts with "() {" and ends with "; command", then the command is run when the shell is started.

The main attack vectors are:
 - CGI scripts (Apache mod_cgi, mod_cgid) on a web server (variables: HTTP_header, REMOTE_HOST, SERVER_PROTOCOL)
 - OpenSSH via AcceptEnv (variables : TERM, ForceCommand avec SSH_ORIGINAL_COMMAND)

An attacker can therefore define a special environment variable, which is transmitted (via CGI or OpenSSH for example) to bash, in order to execute code.
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