| 1 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 2 |
Gentoo Linux Security Advisory GLSA 200703-03 |
| 3 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 4 |
http://security.gentoo.org/ |
| 5 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 6 |
|
| 7 |
Severity: Normal |
| 8 |
Title: ClamAV: Denial of Service |
| 9 |
Date: March 02, 2007 |
| 10 |
Bugs: #167201 |
| 11 |
ID: 200703-03 |
| 12 |
|
| 13 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 14 |
|
| 15 |
Synopsis |
| 16 |
======== |
| 17 |
|
| 18 |
ClamAV contains two vulnerabilities allowing a Denial of Service. |
| 19 |
|
| 20 |
Background |
| 21 |
========== |
| 22 |
|
| 23 |
ClamAV is a GPL virus scanner. |
| 24 |
|
| 25 |
Affected packages |
| 26 |
================= |
| 27 |
|
| 28 |
------------------------------------------------------------------- |
| 29 |
Package / Vulnerable / Unaffected |
| 30 |
------------------------------------------------------------------- |
| 31 |
1 app-antivirus/clamav < 0.90 >= 0.90 |
| 32 |
|
| 33 |
Description |
| 34 |
=========== |
| 35 |
|
| 36 |
An anonymous researcher discovered a file descriptor leak error in the |
| 37 |
processing of CAB archives and a lack of validation of the "id" |
| 38 |
parameter string used to create local files when parsing MIME headers. |
| 39 |
|
| 40 |
Impact |
| 41 |
====== |
| 42 |
|
| 43 |
A remote attacker can send several crafted CAB archives with a |
| 44 |
zero-length record header that will fill the available file descriptors |
| 45 |
until no other is available, which will prevent ClamAV from scanning |
| 46 |
most archives. An attacker can also send an email with specially |
| 47 |
crafted MIME headers to overwrite local files with the permissions of |
| 48 |
the user running ClamAV, such as the virus database file, which could |
| 49 |
prevent ClamAV from detecting any virus. |
| 50 |
|
| 51 |
Workaround |
| 52 |
========== |
| 53 |
|
| 54 |
The first vulnerability can be prevented by refusing any file of type |
| 55 |
CAB, but there is no known workaround for the second issue. |
| 56 |
|
| 57 |
Resolution |
| 58 |
========== |
| 59 |
|
| 60 |
All ClamAV users should upgrade to the latest version: |
| 61 |
|
| 62 |
# emerge --sync |
| 63 |
# emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.90" |
| 64 |
|
| 65 |
References |
| 66 |
========== |
| 67 |
|
| 68 |
[ 1 ] CVE-2007-0897 |
| 69 |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0897 |
| 70 |
[ 2 ] CVE-2007-0898 |
| 71 |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0898 |
| 72 |
|
| 73 |
Availability |
| 74 |
============ |
| 75 |
|
| 76 |
This GLSA and any updates to it are available for viewing at |
| 77 |
the Gentoo Security Website: |
| 78 |
|
| 79 |
http://security.gentoo.org/glsa/glsa-200703-03.xml |
| 80 |
|
| 81 |
Concerns? |
| 82 |
========= |
| 83 |
|
| 84 |
Security is a primary focus of Gentoo Linux and ensuring the |
| 85 |
confidentiality and security of our users machines is of utmost |
| 86 |
importance to us. Any security concerns should be addressed to |
| 87 |
security@g.o or alternatively, you may file a bug at |
| 88 |
http://bugs.gentoo.org. |
| 89 |
|
| 90 |
License |
| 91 |
======= |
| 92 |
|
| 93 |
Copyright 2007 Gentoo Foundation, Inc; referenced text |
| 94 |
belongs to its owner(s). |
| 95 |
|
| 96 |
The contents of this document are licensed under the |
| 97 |
Creative Commons - Attribution / Share Alike license. |
| 98 |
|
| 99 |
http://creativecommons.org/licenses/by-sa/2.5 |
Archives