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Category:   Application (Generic)  >   Screen Vendors:   GNU [multiple authors]
(Mandrake Issues Fix) GNU Screen Integer Overflow in 'ansi.c' May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1008419
SecurityTracker URL:  http://securitytracker.com/id/1008419
CVE Reference:   CAN-2003-0972   (Links to External Site)
Date:  Dec 9 2003
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0.1, 3.9.15, and prior versions
Description:   A vulnerability was reported in GNU Screen. A local user may be able to execute arbitrary code to gain elevated privileges on the target system.

It is reported that a local user can send 2 to 3 gigabytes of data to a target user's screen to trigger a flaw in 'ansi.c'. A large amount of data can reportedly cause the 'w_NumArgs' signed integer to overflow to a negative value, causing a check to ensure that the number of arguments is less than 'MAXARGS' to fail.

The report indicates that screen is typically installed with set user id (setuid) root user privileges of set group id (setgid) utmp group privileges.

The vendor has reportedly been notified.
Impact:   A local user can execute arbitrary code with the privileges of GNU screen (which may be root user privileges or utmp group privileges, depending on the installation).
Solution:   Mandrake has released a fix.

Corporate Server 2.1:
757d420f6d823e26a487eff794490bbe corporate/2.1/RPMS/screen-3.9.11-4.1.C21mdk.i586.rpm
54336329e042b03ebca3c00ca0a1f0c3 corporate/2.1/SRPMS/screen-3.9.11-4.1.C21mdk.src.rpm

Corporate Server 2.1/x86_64:
bf60dabe82228d7f879c1fa232df2e20 x86_64/corporate/2.1/RPMS/screen-3.9.11-4.1.C21mdk.x86_64.rpm
54336329e042b03ebca3c00ca0a1f0c3 x86_64/corporate/2.1/SRPMS/screen-3.9.11-4.1.C21mdk.src.rpm

Mandrake Linux 9.0:
2ed29228596116d87146cb2f1eb75ad3 9.0/RPMS/screen-3.9.11-4.1.90mdk.i586.rpm
db59e945ca7dabc7d81df3388566feb9 9.0/SRPMS/screen-3.9.11-4.1.90mdk.src.rpm

Mandrake Linux 9.1:
4d1ce0bb5f0b8335b9f3da4520280fdb 9.1/RPMS/screen-3.9.13-2.1.91mdk.i586.rpm
025da8fcc964f065afb0c51d2716d472 9.1/SRPMS/screen-3.9.13-2.1.91mdk.src.rpm

Mandrake Linux 9.1/PPC:
b8570b8b63461c8f444dcdbe2c4f6e99 ppc/9.1/RPMS/screen-3.9.13-2.1.91mdk.ppc.rpm
025da8fcc964f065afb0c51d2716d472 ppc/9.1/SRPMS/screen-3.9.13-2.1.91mdk.src.rpm

Mandrake Linux 9.2:
656ca2f3bf4796052972997c214d7909 9.2/RPMS/screen-3.9.15-2.1.92mdk.i586.rpm
4d078d5d3b28c417a51e3a8bfe622f45 9.2/SRPMS/screen-3.9.15-2.1.92mdk.src.rpm

Multi Network Firewall 8.2:
c4b0b5a690692dac14eaeb8590fe2d8f mnf8.2/RPMS/screen-3.9.11-4.1.M82mdk.i586.rpm
9a363746316958e58a843f4d838b0cf0 mnf8.2/SRPMS/screen-3.9.11-4.1.M82mdk.src.rpm
Vendor URL:  www.gnu.org/software/screen/screen.html (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Mandriva/Mandrake)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 27 2003 GNU Screen Integer Overflow in 'ansi.c' May Let Local Users Gain Elevated Privileges


 Source Message Contents
Date:  9 Dec 2003 00:58:32 -0000
Subject:  MDKSA-2003:113 - Updated screen packages fix buffer overflow vulnerability


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

 _______________________________________________________________________

                Mandrake Linux Security Update Advisory
 _______________________________________________________________________

 Package name:           screen
 Advisory ID:            MDKSA-2003:113
 Date:                   December 8th, 2003

 Affected versions:	 9.0, 9.1, 9.2, Corporate Server 2.1,
			 Multi Network Firewall 8.2
 ______________________________________________________________________

 Problem Description:

 A vulnerability was discovered and fixed in screen by Timo Sirainen
 who found an exploitable buffer overflow that allowed privilege
 escalation.  This vulnerability also has the potential to allow
 attackers to gain control of another user's screen session.  The
 ability to exploit is not trivial and requires approximately 2GB
 of data to be transferred in order to do so.
 
 Updated packages are available that fix the vulnerability.
 _______________________________________________________________________

 References:

  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0972
  http://marc.theaimsgroup.com/?l=bugtraq&m=106995837813873&w=2
 ______________________________________________________________________

 Updated Packages:
  
 Corporate Server 2.1:
 757d420f6d823e26a487eff794490bbe  corporate/2.1/RPMS/screen-3.9.11-4.1.C21mdk.i586.rpm
 54336329e042b03ebca3c00ca0a1f0c3  corporate/2.1/SRPMS/screen-3.9.11-4.1.C21mdk.src.rpm

 Corporate Server 2.1/x86_64:
 bf60dabe82228d7f879c1fa232df2e20  x86_64/corporate/2.1/RPMS/screen-3.9.11-4.1.C21mdk.x86_64.rpm
 54336329e042b03ebca3c00ca0a1f0c3  x86_64/corporate/2.1/SRPMS/screen-3.9.11-4.1.C21mdk.src.rpm

 Mandrake Linux 9.0:
 2ed29228596116d87146cb2f1eb75ad3  9.0/RPMS/screen-3.9.11-4.1.90mdk.i586.rpm
 db59e945ca7dabc7d81df3388566feb9  9.0/SRPMS/screen-3.9.11-4.1.90mdk.src.rpm

 Mandrake Linux 9.1:
 4d1ce0bb5f0b8335b9f3da4520280fdb  9.1/RPMS/screen-3.9.13-2.1.91mdk.i586.rpm
 025da8fcc964f065afb0c51d2716d472  9.1/SRPMS/screen-3.9.13-2.1.91mdk.src.rpm

 Mandrake Linux 9.1/PPC:
 b8570b8b63461c8f444dcdbe2c4f6e99  ppc/9.1/RPMS/screen-3.9.13-2.1.91mdk.ppc.rpm
 025da8fcc964f065afb0c51d2716d472  ppc/9.1/SRPMS/screen-3.9.13-2.1.91mdk.src.rpm

 Mandrake Linux 9.2:
 656ca2f3bf4796052972997c214d7909  9.2/RPMS/screen-3.9.15-2.1.92mdk.i586.rpm
 4d078d5d3b28c417a51e3a8bfe622f45  9.2/SRPMS/screen-3.9.15-2.1.92mdk.src.rpm

 Multi Network Firewall 8.2:
 c4b0b5a690692dac14eaeb8590fe2d8f  mnf8.2/RPMS/screen-3.9.11-4.1.M82mdk.i586.rpm
 9a363746316958e58a843f4d838b0cf0  mnf8.2/SRPMS/screen-3.9.11-4.1.M82mdk.src.rpm
 _______________________________________________________________________

 To upgrade automatically use MandrakeUpdate or urpmi.  The verification
 of md5 checksums and GPG signatures is performed automatically for you.

 A list of FTP mirrors can be obtained from:

  http://www.mandrakesecure.net/en/ftp.php

 All packages are signed by MandrakeSoft for security.  You can obtain
 the GPG public key of the Mandrake Linux Security Team by executing:

  gpg --recv-keys --keyserver www.mandrakesecure.net 0x22458A98

 Please be aware that sometimes it takes the mirrors a few hours to
 update.

 You can view other update advisories for Mandrake Linux at:

  http://www.mandrakesecure.net/en/advisories/

 MandrakeSoft has several security-related mailing list services that
 anyone can subscribe to.  Information on these lists can be obtained by
 visiting:

  http://www.mandrakesecure.net/en/mlist.php

 If you want to report vulnerabilities, please contact

  security_linux-mandrake.com

 Type Bits/KeyID     Date       User ID
 pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team
  <security linux-mandrake.com>
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