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Computer vulnerabilities of SAV

computer threat note CVE-2018-9233

Sophos Endpoint Protection: privilege escalation via Weak Unsalted Hash

Synthesis of the vulnerability

An attacker can bypass restrictions via Weak Unsalted Hash of Sophos Endpoint Protection, in order to escalate his privileges.
Severity: 1/4.
Creation date: 04/04/2018.
Identifiers: CVE-2018-9233, VIGILANCE-VUL-25768.
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Description of the vulnerability

An attacker can bypass restrictions via Weak Unsalted Hash of Sophos Endpoint Protection, in order to escalate his privileges.
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threat bulletin CVE-2018-4863

Sophos Endpoint Protection: privilege escalation via Enhanced Tamper Protection

Synthesis of the vulnerability

An attacker can bypass restrictions via Enhanced Tamper Protection of Sophos Endpoint Protection, in order to escalate his privileges.
Severity: 2/4.
Creation date: 04/04/2018.
Identifiers: CVE-2018-4863, VIGILANCE-VUL-25767.
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Description of the vulnerability

An attacker can bypass restrictions via Enhanced Tamper Protection of Sophos Endpoint Protection, in order to escalate his privileges.
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weakness announce 23496

Sophos Anti-Virus: privilege escalation via Mac OS X

Synthesis of the vulnerability

An attacker can bypass restrictions via Mac OS X of Sophos Anti-Virus, in order to escalate his privileges.
Severity: 2/4.
Creation date: 10/08/2017.
Identifiers: VIGILANCE-VUL-23496.
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Description of the vulnerability

An attacker can bypass restrictions via Mac OS X of Sophos Anti-Virus, in order to escalate his privileges.
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security alert CVE-2015-0138 CVE-2015-0204

OpenSSL, LibReSSL, Mono, JSSE: weakening TLS encryption via FREAK

Synthesis of the vulnerability

An attacker, located as a Man-in-the-Middle, can force the Chrome, JSSE, LibReSSL, Mono or OpenSSL client to accept a weak export algorithm, in order to more easily capture or alter exchanged data.
Severity: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 04/03/2015.
Revision date: 09/03/2015.
Identifiers: 122007, 1450666, 1610582, 1647054, 1698613, 1699051, 1699810, 1700225, 1700997, 1701485, 1902260, 1903541, 1963275, 1968485, 1973383, 55767, 7014463, 7022958, 9010028, ARUBA-PSA-2015-003, bulletinjan2015, c04556853, c04679334, c04773241, CERTFR-2015-AVI-108, CERTFR-2015-AVI-117, CERTFR-2015-AVI-146, CERTFR-2016-AVI-303, cisco-sa-20150310-ssl, cpuapr2017, cpujul2018, cpuoct2017, CTX216642, CVE-2015-0138, CVE-2015-0204, DSA-3125-1, FEDORA-2015-0512, FEDORA-2015-0601, FG-IR-15-007, FREAK, FreeBSD-SA-15:01.openssl, HPSBMU03345, HPSBUX03244, HPSBUX03334, JSA10679, MDVSA-2015:019, MDVSA-2015:062, MDVSA-2015:063, NetBSD-SA2015-006, NetBSD-SA2015-007, NTAP-20150205-0001, openSUSE-SU-2015:0130-1, openSUSE-SU-2016:0640-1, RHSA-2015:0066-01, RHSA-2015:0800-01, RHSA-2015:1020-01, RHSA-2015:1021-01, RHSA-2015:1091-01, SA40015, SA88, SA91, SB10108, SB10110, SOL16120, SOL16123, SOL16124, SOL16126, SOL16135, SOL16136, SOL16139, SP-CAAANXD, SPL-95203, SPL-95206, SSA:2015-009-01, SSRT101885, SSRT102000, SUSE-SU-2015:1073-1, SUSE-SU-2015:1085-1, SUSE-SU-2015:1086-1, SUSE-SU-2015:1086-2, SUSE-SU-2015:1086-3, SUSE-SU-2015:1086-4, SUSE-SU-2015:1138-1, SUSE-SU-2015:1161-1, T1022075, USN-2459-1, VIGILANCE-VUL-16301, VN-2015-003_FREAK, VU#243585.
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Description of the vulnerability

The TLS protocol uses a series of messages which have to be exchanged between the client and the server, before establishing a secured session.

Several cryptographic algorithms can be negotiated, such as algorithms allowed for USA export (less than 512 bits).

An attacker, located as a Man-in-the-Middle, can inject during the session initialization a message choosing an export algorithm. This message should generate an error, however some TLS clients accept it.

Note: the variant related to Windows is described in VIGILANCE-VUL-16332.

An attacker, located as a Man-in-the-Middle, can therefore force the Chrome, JSSE, LibReSSL, Mono or OpenSSL client to accept a weak export algorithm, in order to more easily capture or alter exchanged data.
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security alert CVE-2014-2385

Sophos Antivirus Configuration Console: Cross Site Scripting

Synthesis of the vulnerability

An attacker can trigger a Cross Site Scripting of Sophos Antivirus Configuration Console, in order to execute JavaScript code in the context of the web site.
Severity: 2/4.
Creation date: 25/06/2014.
Identifiers: CVE-2014-2385, VIGILANCE-VUL-14937.
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Description of the vulnerability

The Sophos Antivirus Configuration Console product offers a web service.

However, it does not filter received data before inserting them in generated HTML documents.

An attacker can therefore trigger a Cross Site Scripting of Sophos Antivirus Configuration Console, in order to execute JavaScript code in the context of the web site.
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weakness bulletin CVE-2014-0160

OpenSSL: information disclosure via Heartbeat

Synthesis of the vulnerability

An attacker can use the Heartbeat protocol on an application compiled with OpenSSL, in order to obtain sensitive information, such as keys stored in memory.
Severity: 3/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 08/04/2014.
Identifiers: 1669839, 190438, 2076225, 2962393, c04236102, c04267775, c04286049, CA20140413-01, CERTFR-2014-ALE-003, CERTFR-2014-AVI-156, CERTFR-2014-AVI-161, CERTFR-2014-AVI-162, CERTFR-2014-AVI-167, CERTFR-2014-AVI-169, CERTFR-2014-AVI-177, CERTFR-2014-AVI-178, CERTFR-2014-AVI-179, CERTFR-2014-AVI-180, CERTFR-2014-AVI-181, CERTFR-2014-AVI-198, CERTFR-2014-AVI-199, CERTFR-2014-AVI-213, cisco-sa-20140409-heartbleed, CTX140605, CVE-2014-0160, CVE-2014-0346-REJECT, DSA-2896-1, DSA-2896-2, emr_na-c04236102-7, ESA-2014-034, ESA-2014-036, ESA-2014-075, FEDORA-2014-4879, FEDORA-2014-4910, FEDORA-2014-4982, FEDORA-2014-4999, FG-IR-14-011, FreeBSD-SA-14:06.openssl, Heartbleed, HPSBMU02995, HPSBMU03025, HPSBMU03040, ICSA-14-105-03, JSA10623, MDVSA-2014:123, MDVSA-2015:062, NetBSD-SA2014-004, openSUSE-SU-2014:0492-1, openSUSE-SU-2014:0560-1, openSUSE-SU-2014:0719-1, pfSense-SA-14_04.openssl, RHSA-2014:0376-01, RHSA-2014:0377-01, RHSA-2014:0378-01, RHSA-2014:0396-01, RHSA-2014:0416-01, SA40005, SA79, SB10071, SOL15159, SPL-82696, SSA:2014-098-01, SSA-635659, SSRT101565, USN-2165-1, VIGILANCE-VUL-14534, VMSA-2014-0004, VMSA-2014-0004.1, VMSA-2014-0004.2, VMSA-2014-0004.3, VMSA-2014-0004.6, VMSA-2014-0004.7, VU#720951.
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Description of the vulnerability

The Heartbeat extension of TLS (RFC 6520) provides a keep-alive feature, without performing a renegotiation. It exchanges random data in a payload.

Version 1.0.1 of OpenSSL implements Heartbeat, which is enabled by default. The [d]tls1_process_heartbeat() function manages Heartbeat messages. However, it does not check the size of random data, and continues to read after the end of the payload, and then sends the full memory area (up to 64kb) to the peer (client or server).

An attacker can therefore use the Heartbeat protocol on an application compiled with OpenSSL, in order to obtain sensitive information, such as keys stored in memory.
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cybersecurity announce CVE-2014-1213

Sophos Anti-Virus: denial of service via Object

Synthesis of the vulnerability

A local attacker can interact with objects of Sophos Anti-Virus, in order to trigger a denial of service.
Severity: 1/4.
Creation date: 03/02/2014.
Identifiers: BID-65286, CVE-2014-1213, VIGILANCE-VUL-14166.
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Description of the vulnerability

The Windows Object Manager is used to access to all system objects:
  \BaseNamedObjects (mutex, timer, etc.)
  \Drivers
  \FileSystem
  etc.

The Sophos antivirus uses several objects:
  $$!_EVENT_$!__...
  SAV-****
  SAV-Info
  SophosALMonSessionInstance

However, ACLs are not set for these objects.

A local attacker can therefore interact with objects of Sophos Anti-Virus, in order to trigger a denial of service.
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computer vulnerability CVE-2012-6706

Sophos Antivirus: several vulnerabilities

Synthesis of the vulnerability

An attacker can create a malicious VB6/CAB/RAR/PDF file which corrupts the Sophos Antivirus memory, in order to execute code on victim's computer.
Severity: 3/4.
Number of vulnerabilities in this bulletin: 4.
Creation date: 05/11/2012.
Identifiers: BID-56401, bulletinjul2017, CERTA-2012-AVI-627, CERTA-2012-AVI-637, cisco-sa-20121108-sophos, CSCud10556, CVE-2012-6706, VIGILANCE-VUL-12111, VU#662243.
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Description of the vulnerability

The Sophos Antivirus product analyzes viruses contained in documents handled by users. However, malformed documents are not correctly decoded.

An ActiveX created with Visual Basic 6 generates an integer overflow. [severity:3/4]

A malicious CAB archive creates a buffer overflow. [severity:3/4]

A malicious RAR archive corrupts the memory (VIGILANCE-VUL-23073). [severity:3/4; CVE-2012-6706]

A malicious PDF document generates a buffer overflow. [severity:3/4]

An attacker can therefore create a malicious VB6/CAB/RAR/PDF file which corrupts the Sophos Antivirus memory, in order to execute code on victim's computer.
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security threat CVE-2012-1424 CVE-2012-1427 CVE-2012-1428

Sophos Anti-Virus: bypassing via CAB, CHM, ELF, EXE, Office, RAR, TAR, ZIP

Synthesis of the vulnerability

An attacker can create an archive or a program containing a virus, which is not detected by Sophos Anti-Virus.
Severity: 2/4.
Number of vulnerabilities in this bulletin: 16.
Creation date: 21/03/2012.
Identifiers: BID-52579, BID-52587, BID-52589, BID-52590, BID-52591, BID-52598, BID-52599, BID-52600, BID-52608, BID-52611, BID-52612, BID-52613, BID-52617, BID-52621, BID-52623, BID-52626, CVE-2012-1424, CVE-2012-1427, CVE-2012-1428, CVE-2012-1430, CVE-2012-1431, CVE-2012-1438, CVE-2012-1442, CVE-2012-1443, CVE-2012-1446, CVE-2012-1450, CVE-2012-1453, CVE-2012-1456, CVE-2012-1458, CVE-2012-1459, CVE-2012-1461, CVE-2012-1462, VIGILANCE-VUL-11473.
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Description of the vulnerability

Tools extracting archives (CAB, TAR, ZIP, etc.) accept to extract archives which are slightly malformed. Systems also accept to execute programs (ELF, EXE) which are slightly malformed. However, Sophos Anti-Virus does not detect viruses contained in these archives/programs.

A TAR archive containing "\19\04\00\10" at offset 8 bypasses the detection. [severity:1/4; BID-52590, CVE-2012-1424]

A TAR archive containing "\57\69\6E\5A\69\70" at offset 29 bypasses the detection. [severity:1/4; BID-52587, CVE-2012-1427]

A TAR archive containing "\4a\46\49\46" at offset 6 bypasses the detection. [severity:1/4; BID-52579, CVE-2012-1428]

An ELF program containing "\19\04\00\10" at offset 8 bypasses the detection. [severity:2/4; BID-52589, CVE-2012-1430]

An ELF program containing "\4a\46\49\46" at offset 6 bypasses the detection. [severity:2/4; BID-52591, CVE-2012-1431]

A MS Office document containing "ustar" at offset 257 bypasses the detection. [severity:1/4; BID-52599, CVE-2012-1438]

An EXE program containing a large "class" field bypasses the detection. [severity:2/4; BID-52598, CVE-2012-1442]

A RAR archive containing "MZ" as its first 2 bytes bypasses the detection. [severity:1/4; BID-52612, CVE-2012-1443]

An ELF program containing a large "encoding" field bypasses the detection. [severity:2/4; BID-52600, CVE-2012-1446]

A CAB archive containing a large "reserved3" field bypasses the detection. [severity:1/4; BID-52617, CVE-2012-1450]

A CAB archive containing a large "coffFiles" field bypasses the detection. [severity:1/4; BID-52621, CVE-2012-1453]

A ZIP archive starting by TAR data bypasses the detection. [severity:1/4; BID-52608, CVE-2012-1456]

A CHM help file with a header containing a low "interval" value bypasses the detection. [severity:1/4; BID-52611, CVE-2012-1458]

A TAR archive with a header containing a large value bypasses the detection. [severity:1/4; BID-52623, CVE-2012-1459]

A TAR+GZ archive containing two streams bypasses the detection. [severity:1/4; BID-52626, CVE-2012-1461]

A ZIP archive starting by 1024 random bytes bypasses the detection. [severity:1/4; BID-52613, CVE-2012-1462]

An attacker can therefore create an archive containing a virus which is not detected by the antivirus, but which is extracted by extraction tools. The virus is then detected once it has been extracted on victim's computer. An attacker can also create a program, containing a virus which is not detected by the antivirus, but which can be run by the system.
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weakness 9699

Sophos AV: privilege elevation via SAVOnAccessFilter

Synthesis of the vulnerability

A local attacker can use a vulnerability of the SAVOnAccessFilter driver, in order to obtain system privileges.
Severity: 2/4.
Creation date: 10/06/2010.
Identifiers: BID-40715, TPTI-10-03, VIGILANCE-VUL-9699.
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Description of the vulnerability

The Sophos antivirus installs the SAVOnAccessFilter.sys driver, which checks system calls when they are used.

The NtQueryAttributesFile() system call retrieves information on a file. The SAVOnAccessFilter.sys driver checks this system call.

However, parameters of NtQueryAttributesFile() are not correctly filtered by the driver, which corrupts its memory.

A local attacker can therefore use a vulnerability of the SAVOnAccessFilter driver, in order to obtain system privileges.
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