Vulnerabilities in Microsoft Office Could Allow Remote Code Execution
| Risk | Critical |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2015-2520 CVE-2015-2521 CVE-2015-2523 CVE-2015-2545 CVE-2015-2522 |
| CWE-ID | CWE-119 CWE-79 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. Vulnerability #4 is being exploited in the wild. |
| Vulnerable software Subscribe |
Microsoft Excel Client/Desktop applications / Office applications Microsoft Excel for Mac Client/Desktop applications / Office applications Microsoft Office Client/Desktop applications / Office applications Microsoft SharePoint Foundation Server applications / Application servers |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Memory corruption
EUVDB-ID: #VU5562
Risk: High
CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2015-2520
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to boundary error when processing Excel documents. A remote attacker can create a specially crafted Excel file, trick the victim into opening it, cause memory corruption and execute arbitrary code with privileges of the current user.
Successful exploitation of this vulnerability results in arbitrary code execution on the vulnerable system.
MitigationInstall updates from Microsoft website.
Vulnerable software versionsMicrosoft Excel: 2007 - 2010
Microsoft Excel for Mac: 2011 - 2016
External linkshttp://technet.microsoft.com/en-us/library/security/ms15-099
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
2) Memory corruption
EUVDB-ID: #VU5563
Risk: High
CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2015-2521
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to boundary error when processing Excel documents. A remote attacker can create a specially crafted Excel file, trick the victim into opening it, cause memory corruption and execute arbitrary code with privileges of the current user.
Successful exploitation of this vulnerability results in arbitrary code execution on the vulnerable system.
MitigationInstall updates from Microsoft website.
Vulnerable software versionsMicrosoft Excel: 2007 - 2010
External linkshttp://technet.microsoft.com/en-us/library/security/ms15-099
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
3) Memory corruption
EUVDB-ID: #VU5565
Risk: High
CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2015-2523
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to boundary error when processing Excel documents. A remote attacker can create a specially crafted Excel file, trick the victim into opening it, cause memory corruption and execute arbitrary code with privileges of the current user.
Successful exploitation of this vulnerability results in arbitrary code execution on the vulnerable system.
MitigationInstall updates from Microsoft website.
Vulnerable software versionsMicrosoft Excel: 2007 - 2016
Microsoft Excel for Mac: 2011 - 2016
External linkshttp://technet.microsoft.com/en-us/library/security/ms15-099
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website or open a file.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
4) Memory corruption
EUVDB-ID: #VU5566
Risk: Critical
CVSSv3.1: 9.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]
CVE-ID: CVE-2015-2545
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to boundary error when parsing malformed images. A remote attacker can create a file containing a specially crafted image file, trick the victim into opening it, cause memory corruption and execute arbitrary code with privileges of the current user.
Successful exploitation of this vulnerability results in arbitrary code execution on the vulnerable system.
Note: the vulnerability was being actively exploited.
Install updates from Microsoft website.
Vulnerable software versionsMicrosoft Office: 2007 - 2016
External linkshttp://technet.microsoft.com/en-us/library/security/ms15-099
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website or open a file.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
5) Cross-site scripting
EUVDB-ID: #VU5564
Risk: Low
CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2015-2522
CWE-ID:
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-input. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user’s browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
MitigationInstall updates from Microsoft website.
Vulnerable software versionsMicrosoft SharePoint Foundation: 2013
External linkshttp://technet.microsoft.com/en-us/library/security/ms15-099
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
