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Sun Microsystems Solaris sysinfo() Kernel Memory Disclosure
------------------------------------------------------------------------
SUMMARY
Solaris is "a UNIX operating system developed by Sun Microsystems". Local
exploitation of an integer overflow vulnerability in Sun Microsystems Inc.
Solaris allows attackers to read kernel memory from a non-privileged
userspace process.
DETAILS
Vulnerable Systems:
* Solaris 10
The vulnerability specifically exists due to an integer overflow in
/usr/src/uts/common/syscall/systeminfo.c. The vulnerable code is as
follows:
125 if (kstr != NULL) {
126 if ((strcnt = strlen(kstr)) >= count) {
127 getcnt = count - 1;
128 if (subyte(buf + count - 1, 0) < 0)
129 return (set_errno(EFAULT));
130 } else
131 getcnt = strcnt + 1;
132 if (copyout(kstr, buf, getcnt))
133 return (set_errno(EFAULT));
134 return (strcnt + 1);
135 }
If the variable count (which is a value provided by the user invoking the
function) is 0, the function will call the copyout function with a length
argument of -1. Because copyout interprets the length argument as an
unsigned integer, a large amount of data will be copied out to userspace,
well beyond the boundaries that are intended.
Vendor response:
Sun Alert ID 102343 addresses this issue and is available at:
<http://sunsolve.sun.com/search/document.do?assetkey=1-26-102343-1>
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102343-1
Disclosure Timeline:
12/15/2005 - Initial vendor notification
12/15/2005 - Initial vendor response
07/20/2006 - Coordinated public disclosure
ADDITIONAL INFORMATION
The information has been provided by
<mailto:idlabs-advisories@lists.idefense.com> iDEFENSE Labs Security
Advisories.
The original article can be found at:
<http://www.idefense.com/intelligence/vulnerabilities/display.php?id=410>
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=410
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