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Red Hat 6.1 RHSA-1999:042-01 Critical: Screen Insecure Pty Permissions

Calendar Dec 07, 1999 • User Avatar LinuxSecurity Advisories
1 - 2 min read
Redhat Large Esm H500
Topics%20covered

Topics Covered

security advisory Red Hat critical screen permissions insecure pty
Screen uses ptys with world read/write permissions.
 
Red Hat, Inc. Security Advisory
Package Screen
Synopsis screen defaults to not using Unix98 ptys
Advisory ID RHSA-1999:042-01
Issue Date 1999-10-20
Updated on
Keywords screen unix98 pty permissions
Cross references N/A


1. Topic:
Screen uses ptys with world read/write permissions.

2. Problem description:
The version of screen that shipped with Red Hat Linux 6.1 defaulted to not using Unix98 ptys. Since screen is not setuid root, this means that it leaves the ptys with insecure permissions. The updated packages restore the Unix98 pty support. Thanks go to Chris Evans for noting this vulnerability.

Previous versions of Red Hat Linux are not affected by this problem.

3. Bug IDs fixed:(https://bugzilla.redhat.com for more info)
6100

4. Relevant releases/architectures:
Red Hat Linux 6.1, for i386

5. Obsoleted by:
None

6. Conflicts with:
None

7. RPMs required:

Intel:

screen-3.9.4-3.i386.rpm

Source:

screen-3.9.4-3.src.rpm

Architecture neutral:

8. Solution:
For each RPM for your particular architecture, run:

rpm -Uvh filename

where filename is the name of the RPM.

9. Verification:


 MD5 sum                           Package Name

 -------------------------------------------------------------------------
2e5ada61d3d06408bae76bf581d2bf69  screen-3.9.4-3.i386.rpm
09277e5b10b709ac2d974b952cb29e9b  screen-3.9.4-3.src.rpm
These packages are GPG signed by Red Hat Inc. for security. Our key is available at:

You can verify each package with the following command:

rpm --checksig filename

If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command:

rpm --checksig --nogpg filename

10. References:

Red Hat 6.1 RHSA-1999:042-01 Critical: Screen Insecure Pty Permissions

red hat
Calendar Grey December 7, 1999
Dist Redhat Esm H88
Red Hat issued a security advisory for the screen package, emphasizing the fix for inappropriate Unix98 pseudo-terminal permissions and detailing potential vulnerabilities.
Screen uses ptys with world read/write permissions

Solution



For each RPM for your particular architecture, run:


rpm -Uvh filename


where filename is the name of the RPM.

9. Verification:


 MD5 sum                           Package Name

2e5ada61d3d06408bae76bf581d2bf69  screen-3.9.4-3.i386.rpm
09277e5b10b709ac2d974b952cb29e9b  screen-3.9.4-3.src.rpm


These packages are GPG signed by Red Hat Inc. for security. Our key is available at:



You can verify each package with the following command:


rpm --checksig filename


If you only wish to verify that each package has not been corrupted or

tampered with, examine only the md5sum with the following command:


rpm --checksig --nogpg filename







Summary

Topics%20covered

Topics Covered

security advisory Red Hat critical screen permissions insecure pty

References


Package List


Severity
critical
Lowest
Low
Medium
High
Critical

Topic

Topics%20covered

Topics Covered

security advisory Red Hat critical screen permissions insecure pty

Relevant Releases Architectures

Red Hat Linux 6.1, for i386

5. Obsoleted by:

None

6. Conflicts with:

None

7. RPMs required:

Intel:

screen-3.9.4-3.i386.rpm

Source:

screen-3.9.4-3.src.rpm

Architecture neutral:

Bugs Fixed

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