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Red Hat: RHSA-2011:0920-01 Important: FTP Flaw in krb5-appl

red hat
Calendar Grey July 5, 2011
Dist Redhat Esm H88
Red Hat released an update for the krb5-appl packages to fix security vulnerabilities. Users must check for updates to ensure system security and stability
Updated krb5-appl packages that fix one security issue are now available for Red Hat Enterprise Linux 6

Solution

Before applying this update, make sure all previously-released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259

Summary

The krb5-appl packages provide Kerberos-aware telnet, ftp, rcp, rsh, and rlogin clients and servers. While these have been replaced by tools such as OpenSSH in most environments, they remain in use in others.
It was found that gssftp, a Kerberos-aware FTP server, did not properly drop privileges. A remote FTP user could use this flaw to gain unauthorized read or write access to files that are owned by the root group. (CVE-2011-1526)
Red Hat would like to thank the MIT Kerberos project for reporting this issue. Upstream acknowledges Tim Zingelman as the original reporter.
All krb5-appl users should upgrade to these updated packages, which contain a backported patch to correct this issue.

Topics%20covered

Topics Covered

security advisory Red Hat software update important security impact kerberos ftp flaw

References

https://access.redhat.com/security/cve/CVE-2011-1526 https://access.redhat.com/security/updates/classification#important http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-005.txt

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386: krb5-appl-clients-1.0.1-2.el6_1.1.i686.rpm krb5-appl-debuginfo-1.0.1-2.el6_1.1.i686.rpm krb5-appl-servers-1.0.1-2.el6_1.1.i686.rpm
x86_64: krb5-appl-clients-1.0.1-2.el6_1.1.x86_64.rpm krb5-appl-debuginfo-1.0.1-2.el6_1.1.x86_64.rpm krb5-appl-servers-1.0.1-2.el6_1.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64: krb5-appl-debuginfo-1.0.1-2.el6_1.1.x86_64.rpm krb5-appl-servers-1.0.1-2.el6_1.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
Source:
x86_64: krb5-appl-clients-1.0.1-2.el6_1.1.x86_64.rpm krb5-appl-debuginfo-1.0.1-2.el6_1.1.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
i386: krb5-appl-clients-1.0.1-2.el6_1.1.i686.rpm krb5-appl-debuginfo-1.0.1-2.el6_1.1.i686.rpm krb5-appl-servers-1.0.1-2.el6_1.1.i686.rpm
ppc64: krb5-appl-clients-1.0.1-2.el6_1.1.ppc64.rpm krb5-appl-debuginfo-1.0.1-2.el6_1.1.ppc64.rpm krb5-appl-servers-1.0.1-2.el6_1.1.ppc64.rpm
s390x: krb5-appl-clients-1.0.1-2.el6_1.1.s390x.rpm krb5-appl-debuginfo-1.0.1-2.el6_1.1.s390x.rpm krb5-appl-servers-1.0.1-2.el6_1.1.s390x.rpm
x86_64: krb5-appl-clients-1.0.1-2.el6_1.1.x86_64.rpm krb5-appl-debuginfo-1.0.1-2.el6_1.1.x86_64.rpm krb5-appl-servers-1.0.1-2.el6_1.1.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2011:0920-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0920.html
Issue date: 2011-07-05

Topic

Updated krb5-appl packages that fix one security issue are now availablefor Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as havingimportant security impact. A Common Vulnerability Scoring System (CVSS)base score, which gives a detailed severity rating, is available from theCVE link in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat software update important security impact kerberos ftp flaw

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Bugs Fixed

711419 - CVE-2011-1526 krb5, krb5-appl: ftpd incorrect group privilege dropping (MITKRB5-SA-2011-005)

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