| 1 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 2 |
Gentoo Linux Security Advisory GLSA 200411-15 |
| 3 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 4 |
http://security.gentoo.org/ |
| 5 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 6 |
|
| 7 |
Severity: Normal |
| 8 |
Title: OpenSSL, Groff: Insecure tempfile handling |
| 9 |
Date: November 08, 2004 |
| 10 |
Bugs: #68404, #68407 |
| 11 |
ID: 200411-15 |
| 12 |
|
| 13 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 14 |
|
| 15 |
Synopsis |
| 16 |
======== |
| 17 |
|
| 18 |
groffer, included in the Groff package, and the der_chop script, |
| 19 |
included in the OpenSSL package, are both vulnerable to symlink |
| 20 |
attacks, potentially allowing a local user to overwrite arbitrary |
| 21 |
files with the rights of the user running the utility. |
| 22 |
|
| 23 |
Background |
| 24 |
========== |
| 25 |
|
| 26 |
OpenSSL is a toolkit implementing the Secure Sockets Layer and |
| 27 |
Transport Layer Security protocols as well as a general-purpose |
| 28 |
cryptography library. It includes the der_chop script, which is used to |
| 29 |
convert DER-encoded certificates to PEM format. Groff (GNU Troff) is a |
| 30 |
typesetting package which reads plain text mixed with formatting |
| 31 |
commands and produces formatted output. It includes groffer, a command |
| 32 |
used to display groff files and man pages on X and tty. |
| 33 |
|
| 34 |
Affected packages |
| 35 |
================= |
| 36 |
|
| 37 |
------------------------------------------------------------------- |
| 38 |
Package / Vulnerable / Unaffected |
| 39 |
------------------------------------------------------------------- |
| 40 |
1 dev-libs/openssl < 0.9.7d-r2 >= 0.9.7d-r2 |
| 41 |
2 sys-apps/groff < 1.19.1-r2 >= 1.19.1-r2 |
| 42 |
------------------------------------------------------------------- |
| 43 |
2 affected packages on all of their supported architectures. |
| 44 |
------------------------------------------------------------------- |
| 45 |
|
| 46 |
Description |
| 47 |
=========== |
| 48 |
|
| 49 |
groffer and the der_chop script create temporary files in |
| 50 |
world-writeable directories with predictable names. |
| 51 |
|
| 52 |
Impact |
| 53 |
====== |
| 54 |
|
| 55 |
A local attacker could create symbolic links in the temporary files |
| 56 |
directory, pointing to a valid file somewhere on the filesystem. When |
| 57 |
groffer or der_chop is executed, this would result in the file being |
| 58 |
overwritten with the rights of the user running the utility, which |
| 59 |
could be the root user. |
| 60 |
|
| 61 |
Workaround |
| 62 |
========== |
| 63 |
|
| 64 |
There is no known workaround at this time. |
| 65 |
|
| 66 |
Resolution |
| 67 |
========== |
| 68 |
|
| 69 |
All Groff users should upgrade to the latest version: |
| 70 |
|
| 71 |
# emerge --sync |
| 72 |
# emerge --ask --oneshot --verbose ">=sys-apps/groff-1.19.1-r2" |
| 73 |
|
| 74 |
All OpenSSL users should upgrade to the latest version: |
| 75 |
|
| 76 |
# emerge --sync |
| 77 |
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.7d-r2" |
| 78 |
|
| 79 |
Note: /etc/ssl/misc/der_chop is protected by Portage as a configuration |
| 80 |
file. Don't forget to use etc-update and overwrite the old version with |
| 81 |
the new one. |
| 82 |
|
| 83 |
References |
| 84 |
========== |
| 85 |
|
| 86 |
[ 1 ] CAN-2004-0969 |
| 87 |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0969 |
| 88 |
[ 2 ] CAN-2004-0975 |
| 89 |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0975 |
| 90 |
|
| 91 |
Availability |
| 92 |
============ |
| 93 |
|
| 94 |
This GLSA and any updates to it are available for viewing at |
| 95 |
the Gentoo Security Website: |
| 96 |
|
| 97 |
http://security.gentoo.org/glsa/glsa-200411-15.xml |
| 98 |
|
| 99 |
Concerns? |
| 100 |
========= |
| 101 |
|
| 102 |
Security is a primary focus of Gentoo Linux and ensuring the |
| 103 |
confidentiality and security of our users machines is of utmost |
| 104 |
importance to us. Any security concerns should be addressed to |
| 105 |
security@g.o or alternatively, you may file a bug at |
| 106 |
http://bugs.gentoo.org. |
| 107 |
|
| 108 |
License |
| 109 |
======= |
| 110 |
|
| 111 |
Copyright 2004 Gentoo Foundation, Inc; referenced text |
| 112 |
belongs to its owner(s). |
| 113 |
|
| 114 |
The contents of this document are licensed under the |
| 115 |
Creative Commons - Attribution / Share Alike license. |
| 116 |
|
| 117 |
http://creativecommons.org/licenses/by-sa/1.0 |
Archives