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 Cisco IPS

security alert CVE-2016-7052

OpenSSL 1.0.2i: NULL pointer dereference via CRL

Synthesis of the vulnerability

An attacker can force a NULL pointer to be dereferenced via a CRL on an application linked to OpenSSL 1.0.2i, in order to trigger a denial of service.
Severity: 2/4.
Creation date: 26/09/2016.
Identifiers: 1996096, 2000095, 2000209, 2003480, 2003620, 2003673, 2008828, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpuoct2017, CVE-2016-7052, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FreeBSD-SA-16:27.openssl, HPESBHF03856, JSA10759, openSUSE-SU-2016:2496-1, openSUSE-SU-2018:0458-1, SA132, SB10171, SP-CAAAPUE, SPL-129207, SSA:2016-270-01, SUSE-SU-2016:2470-1, SUSE-SU-2016:2470-2, TNS-2016-16, VIGILANCE-VUL-20701.
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Description of the vulnerability

The OpenSSL version 1.0.2i product fixed a bug in CRL management.

However, this fix does not check if a pointer is NULL, before using it.

An attacker can therefore force a NULL pointer to be dereferenced via a CRL on an application linked to OpenSSL 1.0.2i, in order to trigger a denial of service.
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vulnerability note CVE-2016-6309

OpenSSL 1.1.0a: use after free via TLS

Synthesis of the vulnerability

An attacker can force the usage of a freed memory area via TLS on an application linked to OpenSSL 1.1.0a, in order to trigger a denial of service, and possibly to run code.
Severity: 3/4.
Creation date: 26/09/2016.
Identifiers: 1996096, 2000095, 2000209, 2003480, 2003620, 2003673, 2008828, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, CVE-2016-6309, HPESBHF03856, JSA10759, SA132, TNS-2016-16, VIGILANCE-VUL-20700.
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Description of the vulnerability

The OpenSSL version 1.1.0a product fixed the CVE-2016-6307 vulnerability.

However, the reception of a TLS message of 16kb frees a memory area before reusing it.

An attacker can therefore force the usage of a freed memory area via TLS on an application linked to OpenSSL 1.1.0a, in order to trigger a denial of service, and possibly to run code.
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cybersecurity announce CVE-2016-6302 CVE-2016-6303 CVE-2016-6304

OpenSSL: seven vulnerabilities

Synthesis of the vulnerability

An attacker can use several vulnerabilities of OpenSSL.
Severity: 3/4.
Number of vulnerabilities in this bulletin: 7.
Creation date: 22/09/2016.
Identifiers: 1991866, 1991867, 1991870, 1991871, 1991875, 1991876, 1991878, 1991880, 1991882, 1991884, 1991885, 1991886, 1991887, 1991889, 1991892, 1991894, 1991896, 1991902, 1991903, 1991951, 1991955, 1991959, 1991960, 1991961, 1992681, 1993777, 1996096, 1999395, 1999421, 1999474, 1999478, 1999479, 1999488, 1999532, 2000095, 2000209, 2000544, 2002870, 2003480, 2003620, 2003673, 2008828, bulletinapr2017, bulletinjul2016, bulletinoct2016, CERTFR-2016-AVI-320, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpuapr2018, cpujan2017, cpujan2018, cpujul2017, cpujul2019, cpuoct2017, CVE-2016-6302, CVE-2016-6303, CVE-2016-6304, CVE-2016-6305, CVE-2016-6306, CVE-2016-6307, CVE-2016-6308, DLA-637-1, DSA-3673-1, DSA-3673-2, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FreeBSD-SA-16:26.openssl, HPESBHF03856, HT207423, JSA10759, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2016:2496-1, openSUSE-SU-2016:2537-1, openSUSE-SU-2018:0458-1, RHSA-2016:1940-01, RHSA-2016:2802-01, RHSA-2017:1548-01, RHSA-2017:1549-01, RHSA-2017:1550-01, RHSA-2017:1551-01, RHSA-2017:1552-01, RHSA-2017:1658-01, RHSA-2017:1659-01, RHSA-2017:2493-01, RHSA-2017:2494-01, SA132, SA40312, SB10171, SB10215, SOL54211024, SOL90492697, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, STORM-2016-005, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2458-1, SUSE-SU-2016:2468-1, SUSE-SU-2016:2469-1, SUSE-SU-2016:2470-1, SUSE-SU-2016:2470-2, TNS-2016-16, USN-3087-1, USN-3087-2, VIGILANCE-VUL-20678.
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Description of the vulnerability

Several vulnerabilities were announced in OpenSSL.

An attacker can create a memory over consumption via an OCSP request, in order to trigger a denial of service. [severity:3/4; CVE-2016-6304]

An attacker can make a process block itself via SSL_peek, in order to trigger a denial of service. [severity:2/4; CVE-2016-6305]

An attacker can generate a buffer overflow via MDC2_Update, in order to trigger a denial of service, and possibly to run code. [severity:1/4; CVE-2016-6303]

An attacker can generate a read only buffer overflow, in order to trigger a denial of service. [severity:1/4; CVE-2016-6302]

An attacker can generate a read only buffer overflow via the parsing of an X.509 certificate, in order to trigger a denial of service. [severity:1/4; CVE-2016-6306]

An attacker can make the server allocates a large amount of memory to process TLS packets. [severity:1/4; CVE-2016-6307]

An attacker can make the server allocates a large amount of memory to process DTLS packets. [severity:1/4; CVE-2016-6308]
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threat announce CVE-2016-2183 CVE-2016-6329

Blowfish, Triple-DES: algorithms too weak, SWEET32

Synthesis of the vulnerability

An attacker can create a TLS/VPN session with a Blowfish/Triple-DES algorithm, and perform a two days attack, in order to decrypt data.
Severity: 1/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 25/08/2016.
Identifiers: 1610582, 1991866, 1991867, 1991870, 1991871, 1991875, 1991876, 1991878, 1991880, 1991882, 1991884, 1991885, 1991886, 1991887, 1991889, 1991892, 1991894, 1991896, 1991902, 1991903, 1991951, 1991955, 1991959, 1991960, 1991961, 1992681, 1993777, 1994375, 1995099, 1995922, 1998797, 1999054, 1999421, 2000209, 2000212, 2000370, 2000544, 2001608, 2002021, 2002335, 2002336, 2002479, 2002537, 2002870, 2002897, 2002991, 2003145, 2003480, 2003620, 2003673, 2004036, 2008828, 523628, 9010102, bulletinapr2017, c05349499, c05369403, c05369415, c05390849, CERTFR-2017-AVI-012, CERTFR-2019-AVI-049, CERTFR-2019-AVI-311, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpujul2017, cpujul2019, cpuoct2017, CVE-2016-2183, CVE-2016-6329, DSA-2018-124, DSA-2019-131, DSA-3673-1, DSA-3673-2, FEDORA-2016-7810e24465, FEDORA-2016-dc2cb4ad6b, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FG-IR-17-173, HPESBGN03697, HPESBGN03765, HPESBUX03725, HPSBGN03690, HPSBGN03694, HPSBHF03674, ibm10718843, java_jan2017_advisory, JSA10770, KM03060544, NTAP-20160915-0001, openSUSE-SU-2016:2199-1, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2016:2496-1, openSUSE-SU-2016:2537-1, openSUSE-SU-2017:1638-1, openSUSE-SU-2018:0458-1, RHSA-2017:0336-01, RHSA-2017:0337-01, RHSA-2017:0338-01, RHSA-2017:3113-01, RHSA-2017:3114-01, RHSA-2017:3239-01, RHSA-2017:3240-01, RHSA-2018:2123-01, SA133, SA40312, SB10171, SB10186, SB10197, SB10215, SOL13167034, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, SSA:2016-363-01, SSA-556833, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2458-1, SUSE-SU-2016:2468-1, SUSE-SU-2016:2469-1, SUSE-SU-2016:2470-1, SUSE-SU-2016:2470-2, SUSE-SU-2017:1444-1, SUSE-SU-2017:2838-1, SUSE-SU-2017:3177-1, SWEET32, TNS-2016-16, USN-3087-1, USN-3087-2, USN-3270-1, USN-3339-1, USN-3339-2, USN-3372-1, VIGILANCE-VUL-20473.
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Description of the vulnerability

The Blowfish and Triple-DES symetric encryption algorithms use 64 bit blocks.

However, if they are used in CBC mode, a collision occurs after 785 GB transferred, and it is then possible to decrypt blocks with an attack lasting two days.

An attacker can therefore create a TLS/VPN session with a Blowfish/Triple-DES algorithm, and perform a two days attack, in order to decrypt data.
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weakness announce CVE-2016-2182

OpenSSL: memory corruption via BN_bn2dec

Synthesis of the vulnerability

An attacker can generate a memory corruption via BN_bn2dec() of OpenSSL, in order to trigger a denial of service, and possibly to run code.
Severity: 2/4.
Creation date: 24/08/2016.
Identifiers: 1996096, 1999395, 1999421, 1999474, 1999478, 1999479, 1999488, 1999532, 2000095, 2000209, 2002870, 2003480, 2003620, 2003673, 2008828, bulletinapr2017, bulletinjul2016, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpuoct2017, CVE-2016-2182, DLA-637-1, DSA-3673-1, DSA-3673-2, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FreeBSD-SA-16:26.openssl, HPESBHF03856, JSA10759, K01276005, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2016:2537-1, openSUSE-SU-2018:0458-1, RHSA-2016:1940-01, SA132, SA40312, SB10171, SB10215, SOL01276005, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2458-1, SUSE-SU-2016:2468-1, SUSE-SU-2016:2469-1, TNS-2016-16, USN-3087-1, USN-3087-2, VIGILANCE-VUL-20460.
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Description of the vulnerability

The OpenSSL library works on large numbers to perform operations such are RSA.

The BN_bn2dec() function converts a large number to its decimal representation. However, a special number forces BN_div_word() to return a limit value, then data are written after the end of the memory area.

An attacker can therefore generate a memory corruption via BN_bn2dec() of OpenSSL, in order to trigger a denial of service, and possibly to run code.
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cybersecurity announce CVE-2016-2181

OpenSSL: denial of service via DTLS Window

Synthesis of the vulnerability

An attacker can send a DTLS packet with a large sequence number to an application compiled with OpenSSL, in order to trigger a denial of service.
Severity: 2/4.
Creation date: 24/08/2016.
Identifiers: 1996096, 1999395, 1999474, 1999478, 1999479, 1999488, 1999532, 2000095, 2003480, 2003620, 2003673, bulletinapr2017, bulletinjul2016, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpuoct2017, CVE-2016-2181, DLA-637-1, DSA-3673-1, DSA-3673-2, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FreeBSD-SA-16:26.openssl, JSA10759, K59298921, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2016:2537-1, openSUSE-SU-2018:0458-1, RHSA-2016:1940-01, SA132, SB10215, SOL59298921, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2458-1, SUSE-SU-2016:2468-1, SUSE-SU-2016:2469-1, TNS-2016-16, USN-3087-1, USN-3087-2, VIGILANCE-VUL-20458.
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Description of the vulnerability

The OpenSSL library implements DTLS (Datagram Transport Layer Security, for example on UDP).

In order to manage replays, OpenSSL uses a sliding window containing accepted sequence numbers. However, if an attacker sends a packet with a large sequence number, the window is moved, and legitimate packets thus have numbers before the beginning of the window, and are rejected.

An attacker can therefore send a DTLS packet with a large sequence number to an application compiled with OpenSSL, in order to trigger a denial of service.
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computer threat alert CVE-2016-2179

OpenSSL: denial of service via DTLS Reassembly

Synthesis of the vulnerability

An attacker can send DTLS packets in the wrong order with missing packets to an application compiled with OpenSSL, in order to trigger a denial of service.
Severity: 2/4.
Creation date: 24/08/2016.
Identifiers: 1996096, 1999395, 1999474, 1999478, 1999479, 1999488, 1999532, 2000095, 2003480, 2003620, 2003673, bulletinapr2017, bulletinjul2016, bulletinjul2018, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpuoct2017, CVE-2016-2179, DLA-637-1, DSA-3673-1, DSA-3673-2, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FreeBSD-SA-16:26.openssl, HPESBHF03856, JSA10759, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2016:2537-1, openSUSE-SU-2018:0458-1, RHSA-2016:1940-01, SA132, SB10215, SOL23512141, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2458-1, SUSE-SU-2016:2468-1, SUSE-SU-2016:2469-1, TNS-2016-16, USN-3087-1, USN-3087-2, VIGILANCE-VUL-20457.
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Description of the vulnerability

The OpenSSL library implements DTLS (Datagram Transport Layer Security, for example on UDP).

DTLS packets can be in the wrong order. OpenSSL has to keep them in memory, in order to reassemble them. However, in two cases, message queues are not cleared.

An attacker can therefore send DTLS packets in the wrong order with missing packets to an application compiled with OpenSSL, in order to trigger a denial of service.
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security vulnerability CVE-2016-2180

OpenSSL: out-of-bounds memory reading via TS_OBJ_print_bio

Synthesis of the vulnerability

An attacker can force a read at an invalid address via TS_OBJ_print_bio() of OpenSSL, in order to trigger a denial of service, or to obtain sensitive information.
Severity: 1/4.
Creation date: 02/08/2016.
Identifiers: 1359615, 1996096, 2000095, 2003480, 2003620, 2003673, bulletinapr2017, bulletinjul2016, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpuoct2017, CVE-2016-2180, DLA-637-1, DSA-3673-1, DSA-3673-2, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FreeBSD-SA-16:26.openssl, HPESBHF03856, JSA10759, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2018:0458-1, RHSA-2016:1940-01, SA132, SA40312, SB10215, SOL02652550, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2469-1, TNS-2016-16, USN-3087-1, USN-3087-2, VIGILANCE-VUL-20286.
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Description of the vulnerability

The OpenSSL product implements the RFC 3161 Public Key Infrastructure Time-Stamp Protocol.

However, the TS_OBJ_print_bio() function tries to read a memory area located outside the expected range, which triggers a fatal error, or leads to the disclosure of a memory fragment.

An attacker can therefore force a read at an invalid address via TS_OBJ_print_bio() of OpenSSL, in order to trigger a denial of service, or to obtain sensitive information.
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computer vulnerability CVE-2016-2177

OpenSSL: out-of-bounds memory reading

Synthesis of the vulnerability

An attacker can force a memory access at an invalid address in OpenSSL, in order to trigger a denial of service, or to obtain sensitive information.
Severity: 1/4.
Creation date: 09/06/2016.
Identifiers: 1991866, 1991867, 1991870, 1991871, 1991875, 1991876, 1991878, 1991880, 1991882, 1991884, 1991885, 1991886, 1991887, 1991889, 1991892, 1991894, 1991896, 1991902, 1991903, 1991951, 1991955, 1991959, 1991960, 1991961, 1996096, 1999395, 1999421, 1999474, 1999478, 1999479, 1999488, 1999532, 1999724, 2000095, 2000209, 2000544, 2001805, 2002770, 2002870, 2003480, 2003620, 2003673, 2008828, bulletinapr2016, bulletinapr2017, bulletinjul2016, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpuoct2017, CVE-2016-2177, DLA-637-1, DSA-3673-1, DSA-3673-2, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FreeBSD-SA-16:26.openssl, HPESBHF03763, HPESBHF03856, JSA10759, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2016:2537-1, openSUSE-SU-2018:0458-1, RHSA-2016:1940-01, RHSA-2017:1548-01, RHSA-2017:1549-01, RHSA-2017:1550-01, RHSA-2017:1551-01, RHSA-2017:1552-01, RHSA-2017:1658-01, RHSA-2017:1659-01, SA132, SA40312, SB10165, SB10215, SOL23873366, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2458-1, SUSE-SU-2016:2468-1, SUSE-SU-2016:2469-1, TNS-2016-16, USN-3087-1, USN-3087-2, USN-3181-1, VIGILANCE-VUL-19855.
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Description of the vulnerability

The source code of OpenSSL includes many loops where a pointer is used to go through a buffer.

The definition of the C language allows a pointer to be off by one byte after the buffer, but the behavior of any further access is undefined. Several end of loop tests follows the forme "pointer + current data length > end pointer" in such a way that these 2 expressions are not always defined according to the language specification. An attacker which can control dynamic memory allocations can trigger evaluation of undefined conditions and perhaps invalid memory access.

An attacker can therefore force a memory access at an invalid address in OpenSSL, in order to trigger a denial of service, or to obtain sensitive information.
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vulnerability note CVE-2016-2178

OpenSSL: DSA signature not running in constant time

Synthesis of the vulnerability

An attacker can monitor a process performing a DSA signature with OpenSSL, in order to potentially obtain information about the secret key.
Severity: 2/4.
Creation date: 07/06/2016.
Revision date: 08/06/2016.
Identifiers: 1991866, 1991867, 1991870, 1991871, 1991875, 1991876, 1991878, 1991880, 1991882, 1991884, 1991885, 1991886, 1991887, 1991889, 1991892, 1991894, 1991896, 1991902, 1991903, 1991951, 1991955, 1991959, 1991960, 1991961, 1992681, 1993777, 1996096, 1999395, 1999474, 1999478, 1999479, 1999488, 1999532, 1999724, 2000095, 2000544, 2003480, 2003620, 2003673, bulletinapr2016, bulletinapr2017, CERTFR-2016-AVI-333, cisco-sa-20160927-openssl, cpuapr2017, cpujan2018, cpuoct2017, CVE-2016-2178, DLA-637-1, DSA-3673-1, DSA-3673-2, FEDORA-2016-97454404fe, FEDORA-2016-a555159613, FG-IR-16-047, FG-IR-16-048, FG-IR-17-127, FreeBSD-SA-16:26.openssl, HPESBHF03856, JSA10759, openSUSE-SU-2016:2391-1, openSUSE-SU-2016:2407-1, openSUSE-SU-2016:2496-1, openSUSE-SU-2016:2537-1, openSUSE-SU-2018:0458-1, RHSA-2016:1940-01, RHSA-2017:1548-01, RHSA-2017:1549-01, RHSA-2017:1550-01, RHSA-2017:1551-01, RHSA-2017:1552-01, RHSA-2017:1658-01, RHSA-2017:1659-01, SA132, SA40312, SB10215, SOL53084033, SP-CAAAPUE, SPL-129207, SSA:2016-266-01, SUSE-SU-2016:2387-1, SUSE-SU-2016:2394-1, SUSE-SU-2016:2458-1, SUSE-SU-2016:2468-1, SUSE-SU-2016:2469-1, SUSE-SU-2016:2470-1, SUSE-SU-2016:2470-2, TNS-2016-16, USN-3087-1, USN-3087-2, VIGILANCE-VUL-19820.
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Description of the vulnerability

OpenSSL includes an implementation of the DSA algorithm.

The BN_FLG_CONSTTIME flag requires this operation to be performed in constant time, in order to block attacks watching the process. However, the dsa_sign_setup() function of the lib/libssl/src/crypto/dsa/dsa_ossl.c file does not correctly initialize the BN_FLG_CONSTTIME flag.

An attacker can therefore monitor a process performing a DSA signature with OpenSSL, in order to potentially obtain information about the secret key.
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