Zaptel ahdi/tor2.c kernel memory overwrite

zaptel-tor2-memory-overwrite (47666)

Medium Risk

Description:

Zaptel (DAHDI) could allow a local attacker to overwrite kernel memory, caused by an array index error in the dahdi/tor2.c driver. An attacker in the dialout group could exploit this vulnerability using /dev/zap/ctl to overwrite an integer value and possibly launch further attacks against the vulnerable system.

*CVSS:

Base Score:	3.6
Access Vector:	Local
Access Complexity:	Low
Authentication:	None
Confidentiality Impact:	None
Integrity Impact:	Partial
Availability Impact:	Partial
Temporal Score:	2.8
Exploitability:	Unproven
Remediation Level:	Temporary-Fix
Report Confidence:	Confirmed

Consequences:

File Manipulation

Remedy:

Apply the patch for this vulnerability, available from the Digium SVN Repository. See References.

References:

• Digium SVN Repository: Revision 5590.
• oss-security Mailing List, Fri, 19 Dec 2008 14:32:12 +0100 : CVE Request - Incomplete dahdi/zaptel tor2.c patch for .
• Red Hat Bugzilla ¿ Bug 475446: CVE-2008-5396 zaptel: Array index error in multiple zaptel drivers.
• CVE-2008-5744: Array index error in the dahdi/tor2.c driver in Zaptel (aka DAHDI) 1.4.11 and earlier allows local users in the dialout group to overwrite an integer value in kernel memory by writing to /dev/zap/ctl, related to an incorrect tor2 patch for CVE-2008-5396 that uses the wrong variable in a range check against the value of lc->sync.
• DSA-1699: zaptel -- array index error
• SA32960: DAHDI "ZT_SPANCONFIG" IOCTL Privilege Escalation Vulnerability

Platforms Affected:

• Debian Debian Linux 4.0
• Digium Zaptel 1.2
• Digium Zaptel 1.2.27
• Digium Zaptel 1.4
• Digium Zaptel 1.4.11

Reported:

Dec 19, 2008

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