Gentoo Linux Advisories: rsync, glibc

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Gentoo Linux Security Advisory GLSA 200408-17

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http://security.gentoo.org/

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Severity: Normal
Title: rsync: Potential information leakage
Date: August 17, 2004
Bugs: #60309
ID: 200408-17

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Synopsis

rsync fails to properly sanitize paths. This vulnerability could
allow the listing of arbitrary files and allow file overwriting
outside module’s path on rsync server configurations that allow
uploading.

Background

rsync is a utility that provides fast incremental file
transfers. It is used to efficiently synchronize files between
hosts and is used by emerge to fetch Gentoo’s Portage tree. rsyncd
is the rsync daemon, which listens to connections from rsync
clients.

Affected packages

Description

The paths sent by the rsync client are not checked thoroughly
enough. It does not affect the normal send/receive filenames that
specify what files should be transferred. It does affect certain
option paths that cause auxilliary files to be read or written.

Impact

When rsyncd is used without chroot (“use chroot = false” in the
rsyncd.conf file), this vulnerability could allow the listing of
arbitrary files outside module’s path and allow file overwriting
outside module’s path on rsync server configurations that allows
uploading. Both possibilities are exposed only when chroot option
is disabled.

Workaround

You should never set the rsync daemon to run with “use chroot =
false”.

Resolution

All users should update to the latest version of the rsync
package.

    # emerge sync
    # emerge -pv ">=net-misc/rsync-2.6.0-r3"
    # emerge ">=net-misc/rsync-2.6.0-r3"

References

[ 1 ] rsync Advisory

http://samba.org/rsync/#security_aug04

[ 2 ] rsync 2.6.2 announcement

http://lists.samba.org/archive/rsync-announce/2004/000017.html

Availability

This GLSA and any updates to it are available for viewing at the
Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200408-17.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or
alternatively, you may file a bug at http://bugs.gentoo.org.

License

Copyright 2004 Gentoo Foundation, Inc; referenced text belongs
to its owner(s).

The contents of this document are licensed under the Creative
Commons – Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0

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Gentoo Linux Security Advisory GLSA 200408-16

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http://security.gentoo.org/

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Severity: Low
Title: glibc: Information leak with LD_DEBUG
Date: August 16, 2004
Bugs: #59526
ID: 200408-16

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Synopsis

glibc contains an information leak vulnerability allowing the
debugging of SUID binaries.

Background

The GNU C library defines various Unix-like “system calls” and
other basic facilities needed for a standard POSIX-like application
to operate.

Affected packages

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# Package 1 only applies to ALPHA, ARM, HPPA, IA64 and SPARC
users.
# Package 2 only applies to x86 and PPC users.
# Package 3 only applies to MIPS users.
# Package 4 only applies to AMD64 users.
# Package 5 only applies to S390 users.
# Package 6 only applies to PPC64 users.

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NOTE: Certain packages are still vulnerable. Users
should migrate to another package if one is available or wait for
the existing packages to be marked stable by their architecture
maintainers.

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6 affected packages; please see the notes above…

Description

Silvio Cesare discovered a potential information leak in glibc.
It allows LD_DEBUG on SUID binaries where it should not be allowed.
This has various security implications, which may be used to gain
confidentional information.

Impact

An attacker can gain the list of symbols a SUID application uses
and their locations and can then use a trojaned library taking
precendence over those symbols to gain information or perform
further exploitation.

Workaround

There is no known workaround at this time. All users are
encouraged to upgrade to the latest available version of glibc.

Resolution

All glibc users should upgrade to the latest version:

    # emerge sync
    # emerge -pv your_version
    # emerge your_version

Availability

This GLSA and any updates to it are available for viewing at the
Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200408-16.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or
alternatively, you may file a bug at http://bugs.gentoo.org.

License

Copyright 2004 Gentoo Foundation, Inc; referenced text belongs
to its owner(s).

The contents of this document are licensed under the Creative
Commons – Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0