(Slackware Issues Fix) mod_ssl Format String Error in 'ssl_engine_ext' May Let Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1010773 |
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SecurityTracker URL: http://securitytracker.com/id/1010773
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CVE Reference:
CAN-2004-0700
(Links to External Site)
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Date: Jul 26 2004
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 2.8.19-1.3.31
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Description:
A format string vulnerability was reported in mod_ssl. In certain cases where Apache mod_proxy is also used, a remote user may be able to cause arbitrary code to be executed on the target user's system.
Ralf S. Engelschall reported that if Apache is used as a proxy and an HTTPS URL such as 'https://foo%s.example.com/' is supplied and a hostname 'foo%s' exists in the 'example.com' zone, the flaw can reportedly be triggered.
The flaw reportedly resides in an error message call in 'ssl_engine_ext.c'.
The report credits Virulent <virulent@siyahsapka.org> with reporting a similar bug (that was reportedly not exploitable) and triggering a review of the code.
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Impact:
A remote user may be able to cause arbitrary code to be executed on the target system in certain cases.
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Solution:
Slackware has released a fix.
Updated package for Slackware 8.1:
ftp://ftp.slackware.com/pub/slackware/slackware-8.1/patches/packages/mod_ssl-2.8.19_1.3.31-i386-1.tgz
Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/mod_ssl-2.8.19_1.3.31-i386-1.tgz
Updated package for Slackware 9.1:
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/mod_ssl-2.8.19_1.3.31-i486-1.tgz
Updated package for Slackware 10.0:
ftp://ftp.slackware.com/pub/slackware/slackware-10.0/patches/packages/mod_ssl-2.8.19_1.3.31-i486-1.tgz
Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/mod_ssl-2.8.19_1.3.31-i486-1.tgz
The MD5 signatures are:
Slackware 8.1 package:
363f86afca6946e4840d7e2ed5efcc96 mod_ssl-2.8.19_1.3.31-i386-1.tgz
Slackware 9.0 package:
d213da77d2f8822206b76cf9c6c81067 mod_ssl-2.8.19_1.3.31-i386-1.tgz
Slackware 9.1 package:
d304dc1cf684e60c3611c998ac055986 mod_ssl-2.8.19_1.3.31-i486-1.tgz
Slackware 10.0 package:
efb6b8193b4c6189c9ae5fe2035526da mod_ssl-2.8.19_1.3.31-i486-1.tgz
Slackware -current package:
efb6b8193b4c6189c9ae5fe2035526da mod_ssl-2.8.19_1.3.31-i486-1.tgz
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Vendor URL: www.modssl.org/ (Links to External Site)
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Cause:
Input validation error, State error
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Underlying OS:
Linux (Slackware)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Sun, 25 Jul 2004 20:24:56 -0700 (PDT)
Subject: [slackware-security] new mod_ssl packages (SSA:2004-207-02)
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
[slackware-security] new mod_ssl packages (SSA:2004-207-02)
New mod_ssl packages are available for Slackware 8.1, 9.0, 9.1, 10.0
and -current to fix a security issue. A format string vulnerability in
mod_proxy hook functions could allow an attacker to run code as the mod_ssl
user. Sites using mod_ssl should upgrade (be sure to back up your existing
key files first).
Here are the details from the Slackware 10.0 ChangeLog:
+--------------------------+
Sun Jul 25 14:17:29 PDT 2004
patches/packages/mod_ssl-2.8.19_1.3.31-i486-1.tgz:
Upgraded to mod_ssl-2.8.19-1.3.31.
This fixes a security hole (ssl_log() related format string
vulnerability in mod_proxy hook functions), so sites using mod_ssl
should upgrade to the new version. Be sure to back up your existing
key files first.
(* Security fix *)
+--------------------------+
Where to find the new packages:
+-----------------------------+
Updated package for Slackware 8.1:
ftp://ftp.slackware.com/pub/slackware/slackware-8.1/patches/packages/mod_ssl-2.8.19_1.3.31-i386-1.tgz
Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/mod_ssl-2.8.19_1.3.31-i386-1.tgz
Updated package for Slackware 9.1:
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/mod_ssl-2.8.19_1.3.31-i486-1.tgz
Updated package for Slackware 10.0:
ftp://ftp.slackware.com/pub/slackware/slackware-10.0/patches/packages/mod_ssl-2.8.19_1.3.31-i486-1.tgz
Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/mod_ssl-2.8.19_1.3.31-i486-1.tgz
MD5 signatures:
+-------------+
Slackware 8.1 package:
363f86afca6946e4840d7e2ed5efcc96 mod_ssl-2.8.19_1.3.31-i386-1.tgz
Slackware 9.0 package:
d213da77d2f8822206b76cf9c6c81067 mod_ssl-2.8.19_1.3.31-i386-1.tgz
Slackware 9.1 package:
d304dc1cf684e60c3611c998ac055986 mod_ssl-2.8.19_1.3.31-i486-1.tgz
Slackware 10.0 package:
efb6b8193b4c6189c9ae5fe2035526da mod_ssl-2.8.19_1.3.31-i486-1.tgz
Slackware -current package:
efb6b8193b4c6189c9ae5fe2035526da mod_ssl-2.8.19_1.3.31-i486-1.tgz
Installation instructions:
+------------------------+
First, stop apache:
# apachectl stop
IMPORTANT: Backup any keys/certificates you wish to save for
mod_ssl (in /etc/apache/ssl.*)
Next, upgrade these packages as root:
# upgradepkg mod_ssl-2.8.19_1.3.31-i486-1.tgz
If necessary, restore any mod_ssl config files.
Finally, restart apache:
# apachectl startssl
+-----+
Slackware Linux Security Team
http://slackware.com/gpg-key
security@slackware.com
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