| 1 |
-----BEGIN PGP SIGNED MESSAGE----- |
| 2 |
Hash: SHA1 |
| 3 |
|
| 4 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 5 |
Gentoo Linux Security Advisory GLSA 200405-03 |
| 6 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 7 |
http://security.gentoo.org/ |
| 8 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 9 |
|
| 10 |
Severity: High |
| 11 |
Title: ClamAV VirusEvent parameter vulnerability |
| 12 |
Date: May 11, 2004 |
| 13 |
Bugs: #46264 |
| 14 |
ID: 200405-03 |
| 15 |
|
| 16 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 17 |
|
| 18 |
Synopsis |
| 19 |
======== |
| 20 |
|
| 21 |
With a specific configuration (using %f in the VirusEvent parameter), |
| 22 |
Clam AntiVirus is vulnerable to an attack allowing execution of |
| 23 |
arbitrary commands. |
| 24 |
|
| 25 |
Background |
| 26 |
========== |
| 27 |
|
| 28 |
- From http://www.clamav.net/ : |
| 29 |
|
| 30 |
"Clam AntiVirus is a GPL anti-virus toolkit for UNIX. The main purpose |
| 31 |
of this software is the integration with mail servers (attachment |
| 32 |
scanning). The package provides a flexible and scalable multi-threaded |
| 33 |
daemon, a command line scanner, and a tool for automatic updating via |
| 34 |
Internet. The programs are based on a shared library distributed with |
| 35 |
the Clam AntiVirus package, which you can use with your own software. |
| 36 |
Most importantly, the virus database is kept up to date." |
| 37 |
|
| 38 |
Affected packages |
| 39 |
================= |
| 40 |
|
| 41 |
------------------------------------------------------------------- |
| 42 |
Package / Vulnerable / Unaffected |
| 43 |
------------------------------------------------------------------- |
| 44 |
1 net-mail/clamav < 0.70 >= 0.70 |
| 45 |
|
| 46 |
Description |
| 47 |
=========== |
| 48 |
|
| 49 |
The VirusEvent parameter in the clamav.conf configuration file allows |
| 50 |
to specify a system command to run whenever a virus is found. This |
| 51 |
system command can make use of the "%f" parameter which is replaced by |
| 52 |
the name of the file infected. The name of the file scanned is under |
| 53 |
control of the attacker and is not sufficiently checked. Version 0.70 |
| 54 |
of clamav disables the use of the "%f" parameter. |
| 55 |
|
| 56 |
Impact |
| 57 |
====== |
| 58 |
|
| 59 |
Sending a virus with a malicious file name can result in execution of |
| 60 |
arbirary system commands with the rights of the antivirus process. |
| 61 |
Since clamav is often associated to mail servers for email scanning, |
| 62 |
this attack can be used remotely. |
| 63 |
|
| 64 |
Workaround |
| 65 |
========== |
| 66 |
|
| 67 |
You should not use the "%f" parameter in your VirusEvent configuration. |
| 68 |
|
| 69 |
Resolution |
| 70 |
========== |
| 71 |
|
| 72 |
All users of Clam AntiVirus should upgrade to the latest stable |
| 73 |
version: |
| 74 |
|
| 75 |
# emerge sync |
| 76 |
|
| 77 |
# emerge -pv ">=net-mail/clamav-0.70" |
| 78 |
# emerge ">=net-mail/clamav-0.70" |
| 79 |
|
| 80 |
Availability |
| 81 |
============ |
| 82 |
|
| 83 |
This GLSA and any updates to it are available for viewing at |
| 84 |
the Gentoo Security Website: |
| 85 |
|
| 86 |
http://security.gentoo.org/glsa/glsa-200405-03.xml |
| 87 |
|
| 88 |
Concerns? |
| 89 |
========= |
| 90 |
|
| 91 |
Security is a primary focus of Gentoo Linux and ensuring the |
| 92 |
confidentiality and security of our users machines is of utmost |
| 93 |
importance to us. Any security concerns should be addressed to |
| 94 |
security@g.o or alternatively, you may file a bug at |
| 95 |
http://bugs.gentoo.org. |
| 96 |
|
| 97 |
License |
| 98 |
======= |
| 99 |
|
| 100 |
Copyright 2004 Gentoo Technologies, Inc; referenced text |
| 101 |
belongs to its owner(s). |
| 102 |
|
| 103 |
The contents of this document are licensed under the |
| 104 |
Creative Commons - Attribution / Share Alike license. |
| 105 |
|
| 106 |
http://creativecommons.org/licenses/by-sa/1.0 |
| 107 |
|
| 108 |
-----BEGIN PGP SIGNATURE----- |
| 109 |
Version: GnuPG v1.2.4 (GNU/Linux) |
| 110 |
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org |
| 111 |
|
| 112 |
iD8DBQFAoSonvcL1obalX08RAjecAJwNuR/ncOKtT3Xm6jyTupHVANa4NACggt/F |
| 113 |
DsQi2RD/Arec/N1AuePh3Rk= |
| 114 |
=O0tM |
| 115 |
-----END PGP SIGNATURE----- |
Archives