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Mandriva Advisories

Package name tightvnc
Date April 10th, 2007
Advisory ID MDKSA-2007:080-1
Affected versions 2007.1
Synopsis Updated tightvnc packages fix integer overflow vulnerabilities

Problem Description

Local exploitation of a memory corruption vulnerability in the X.Org
and XFree86 X server could allow an attacker to execute arbitrary
code with privileges of the X server, typically root.

The vulnerability exists in the ProcXCMiscGetXIDList() function in the
XC-MISC extension. This request is used to determine what resource IDs
are available for use. This function contains two vulnerabilities,
both result in memory corruption of either the stack or heap. The
ALLOCATE_LOCAL() macro used by this function allocates memory on the
stack using alloca() on systems where alloca() is present, or using
the heap otherwise. The handler function takes a user provided value,
multiplies it, and then passes it to the above macro. This results in
both an integer overflow vulnerability, and an alloca() stack pointer
shifting vulnerability. Both can be exploited to execute arbitrary
code. (CVE-2007-1003)

iDefense reported two integer overflows in the way X.org handled
various font files. A malicious local user could exploit these issues
to potentially execute arbitrary code with the privileges of the
X.org server. (CVE-2007-1351, CVE-2007-1352)

TightVNC uses some of the same code base as Xorg, and has the same
vulnerable code.

Updated packages are patched to address these issues.

Update:

Packages for Mandriva Linux 2007.1 are now available.

Updated Packages

Mandriva Linux 2007.1

 9c14a56106984cd16780a1fd7e9c7beb  2007.1/i586/tightvnc-1.2.9-16.1mdv2007.1.i586.rpm
 8aa3673bc8843dae12d9f18c4226214e  2007.1/i586/tightvnc-doc-1.2.9-16.1mdv2007.1.i586.rpm
 d78d10a879bc1b1c461f75b815dcd656  2007.1/i586/tightvnc-server-1.2.9-16.1mdv2007.1.i586.rpm 
 59e94b523bc078f3997f689dae0e22b5  2007.1/SRPMS/tightvnc-1.2.9-16.1mdv2007.1.src.rpm

Mandriva Linux 2007.1/X86_64

 26e585c8ba950720c17ea4ce1373c05c  2007.1/x86_64/tightvnc-1.2.9-16.1mdv2007.1.x86_64.rpm
 6f031ef92c5bec87488bba5861f0d41e  2007.1/x86_64/tightvnc-doc-1.2.9-16.1mdv2007.1.x86_64.rpm
 205e13d0c46dc25bfa39c7dcfafe6dcb  2007.1/x86_64/tightvnc-server-1.2.9-16.1mdv2007.1.x86_64.rpm 
 59e94b523bc078f3997f689dae0e22b5  2007.1/SRPMS/tightvnc-1.2.9-16.1mdv2007.1.src.rpm

References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1003
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1351
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1352

Upgrade

To upgrade automatically, use MandrivaUpdate.


Verification

Please verify the update prior to upgrading to ensure the integrity of the downloaded package. You can do this with the command :

                rpm --checksig package.rpm

You can get the GPG public key of the Mandriva Security Team to verify the GPG signature of each RPM.

If you use MandrivaUpdate, the verification of md5 checksum and GPG signature is performed automatically for you.