Exploitalert - Database of Exploits

Microsoft Office Excel Buffer Overflow Vulnerability

CVE	Category	Price	Severity
CVE-2006-0031	CWE-119	$5000	High

Author	Risk	Exploitation Type	Date
Unknown	Critical	Local	2006-03-23

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope		S	An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

http://cxsecurity.com/ascii/WLB-2006030081

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Relase Date: 2006-03-15 CVE: CVE-2006-0031 Affected Products: ================== Microsoft Office Excel 2000 Microsoft Office Excel XP Microsoft Office Excel 2003 Impact: ======= Microsoft Excel is a popular spreadsheet program of Microsoft Office product. Eyas of XFOCUS Security Team discovered a buffer overflow vulnerability when Excel processes a malicous ".xls" file, which might cause Excel to crash or even execute arbitrary code. Description: ============ Excel will initialize a stack buffer with 0x0e0e0e0e when it open a ".xls" file, but Excel uses a user-supplied length which will cause a stack buffer overflow. The following code is from excel v9.0.0.8924 >> >> .text:3003FE0C movzx eax, word ptr [ebx] >> .text:3003FE0F xor ecx, ecx >> .text:3003FE11 cmp eax, 0Eh >> .text:3003FE14 mov [ebp+var_8], ecx >> .text:3003FE17 jg loc_301C01B5 >> >> .text:301C01B5 mov byte ptr [ebp+ecx+var_138], cl >> .text:301C01BC inc ecx >> .text:301C01BD cmp ecx, 0Eh >> .text:301C01C0 jle short loc_301C01B5 >> .text:301C01C2 cmp ecx, eax >> .text:301C01C4 mov [ebp-8], ecx >> .text:301C01C7 jg loc_3003FFC9 >> .text:301C01CD sub eax, ecx >> .text:301C01CF lea edi, [ebp+ecx+var_138] >> .text:301C01D6 inc eax >> .text:301C01D7 mov edx, eax >> .text:301C01D9 mov eax, 0E0E0E0Eh >> .text:301C01DE mov ecx, edx >> .text:301C01E0 mov esi, ecx >> .text:301C01E2 shr ecx, 2 >> .text:301C01E5 rep stosd <== buffer overflow Vendor Status: ============== 2005.12.27 Informed the vendor. 2006.01.03 The vendor confirmed the vulnerability. 2006.03.14 The vendor releases a new version to fix the vulnerability. The vendor has released patch to fix this vulnerability, which is available for download at: http://www.microsoft.com/technet/security/Bulletin/MS06-012.mspx - -- Kind Regards, - --- XFOCUS Security Team http://www.xfocus.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFEF5nIwhDwaF6cSWIRApKUAJ4/uJTH3wMPN2CtiePk59xqB9kJIwCePBoa 5DmfZj+YZc1IqX/EKsvyqBA= =EAQ7 -----END PGP SIGNATURE-----

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