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Category:  Application (Security)  >  Mod_ssl Vendors:  Modssl.org
(Slackware Issues Fix) mod_ssl Format String Error in 'ssl_engine_ext' May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1010773
SecurityTracker URL:  http://securitytracker.com/id?1010773
CVE Reference:  CAN-2004-0700   (Links to External Site)
Date:  Jul 26 2004
Impact:  Execution of arbitrary code via network, User access via network
Fix Available:  Yes   Vendor Confirmed:  Yes  
Version(s): prior to 2.8.19-1.3.31
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.
Impact:  A remote user may be able to cause arbitrary code to be executed on the target system in certain cases.
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
Vendor URL:  www.modssl.org/ (Links to External Site)
Cause:  Input validation error, State error
Underlying OS:  Linux (Slackware)
Underlying OS Comments:  8.1, 9.0, 9.1, 10.0, and -current
Reported By:  Slackware Security Team <security@slackware.com>
Message History:   This archive entry is a follow-up to the message listed below.
Jul 16 2004 mod_ssl Format String Error in 'ssl_engine_ext' May Let Remote Users Execute Arbitrary Code


 Source Message Contents
Date:  Sun, 25 Jul 2004 20:24:56 -0700 (PDT)
From:  Slackware Security Team <security@slackware.com>
Subject:  [slackware-security] new mod_ssl packages (SSA:2004-207-02)

 


-----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.tg
z

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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