| 1 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 2 |
Gentoo Linux Security Advisory GLSA 200412-04 |
| 3 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 4 |
http://security.gentoo.org/ |
| 5 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 6 |
|
| 7 |
Severity: Normal |
| 8 |
Title: Perl: Insecure temporary file creation |
| 9 |
Date: December 07, 2004 |
| 10 |
Bugs: #66360 |
| 11 |
ID: 200412-04 |
| 12 |
|
| 13 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 14 |
|
| 15 |
Synopsis |
| 16 |
======== |
| 17 |
|
| 18 |
Perl is vulnerable to symlink attacks, potentially allowing a local |
| 19 |
user to overwrite arbitrary files. |
| 20 |
|
| 21 |
Background |
| 22 |
========== |
| 23 |
|
| 24 |
Perl is a stable, cross-platform programming language created by Larry |
| 25 |
Wall. |
| 26 |
|
| 27 |
Affected packages |
| 28 |
================= |
| 29 |
|
| 30 |
------------------------------------------------------------------- |
| 31 |
Package / Vulnerable / Unaffected |
| 32 |
------------------------------------------------------------------- |
| 33 |
1 dev-lang/perl < 5.8.5-r2 *>= 5.8.5-r2 |
| 34 |
>= 5.8.6-r1 |
| 35 |
dev-lang/perl == 5.8.6 *>= 5.8.5-r2 |
| 36 |
>= 5.8.6-r1 |
| 37 |
|
| 38 |
Description |
| 39 |
=========== |
| 40 |
|
| 41 |
Some Perl modules create temporary files in world-writable directories |
| 42 |
with predictable names. |
| 43 |
|
| 44 |
Impact |
| 45 |
====== |
| 46 |
|
| 47 |
A local attacker could create symbolic links in the temporary files |
| 48 |
directory, pointing to a valid file somewhere on the filesystem. When a |
| 49 |
Perl script is executed, this would result in the file being |
| 50 |
overwritten with the rights of the user running the utility, which |
| 51 |
could be the root user. |
| 52 |
|
| 53 |
Workaround |
| 54 |
========== |
| 55 |
|
| 56 |
There is no known workaround at this time. |
| 57 |
|
| 58 |
Resolution |
| 59 |
========== |
| 60 |
|
| 61 |
All Perl users should upgrade to the latest version: |
| 62 |
|
| 63 |
# emerge --sync |
| 64 |
# emerge --ask --oneshot --verbose ">=perl-5.8.5-r2" |
| 65 |
|
| 66 |
References |
| 67 |
========== |
| 68 |
|
| 69 |
[ 1 ] CAN-2004-0976 |
| 70 |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0976 |
| 71 |
[ 2 ] Trustix Advisory #2004-0050 |
| 72 |
http://www.trustix.org/errata/2004/0050/ |
| 73 |
|
| 74 |
Availability |
| 75 |
============ |
| 76 |
|
| 77 |
This GLSA and any updates to it are available for viewing at |
| 78 |
the Gentoo Security Website: |
| 79 |
|
| 80 |
http://security.gentoo.org/glsa/glsa-200412-04.xml |
| 81 |
|
| 82 |
Concerns? |
| 83 |
========= |
| 84 |
|
| 85 |
Security is a primary focus of Gentoo Linux and ensuring the |
| 86 |
confidentiality and security of our users machines is of utmost |
| 87 |
importance to us. Any security concerns should be addressed to |
| 88 |
security@g.o or alternatively, you may file a bug at |
| 89 |
http://bugs.gentoo.org. |
| 90 |
|
| 91 |
License |
| 92 |
======= |
| 93 |
|
| 94 |
Copyright 2004 Gentoo Foundation, Inc; referenced text |
| 95 |
belongs to its owner(s). |
| 96 |
|
| 97 |
The contents of this document are licensed under the |
| 98 |
Creative Commons - Attribution / Share Alike license. |
| 99 |
|
| 100 |
http://creativecommons.org/licenses/by-sa/2.0 |
Archives