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SUSE Security Summary Report
Announcement ID: SUSE-SR:2007:022 Date: Fri, 26 Oct 2007 16:00:00 +0000 Cross-References: CVE-2007-4565, CVE-2007-4619, CVE-2007-4752 CVE-2007-5191, CVE-2007-5540, CVE-2007-5541
Content of this advisory: 1) Solved Security Vulnerabilities: - fetchmail remote denial of service attack - flac integer overflows - opera 9.24 security update - util-linux mount setuid/setgid checking problem - util-linux mount buffer overflow - openssh X11 cookie and SIGALRM fixes 2) Pending Vulnerabilities, Solutions, and Work-Arounds: None listed this week. 3) Authenticity Verification and Additional Information
1) Solved Security Vulnerabilities
To avoid flooding mailing lists with SUSE Security Announcements for minor issues, SUSE Security releases weekly summary reports for the low profile vulnerability fixes. The SUSE Security Summary Reports do not list md5 sums or download URLs like the SUSE Security Announcements that are released for more severe vulnerabilities.
Fixed packages for the following incidents are already available on our FTP server and via the YaST Online Update.
- fetchmail remote denial of service attack
A remote denial-of-service attack was fixed in fetchmail.
This issue is tracked by the Mitre CVE ID CVE-2007-4565 and was fixed for all SUSE Linux based products.
- flac integer overflows
Multiple integer overflows in flac could potentially be exploited by attackers via specially crafted files to execute code in the context of the user opening the file (CVE-2007-4619).
flac was updated on all affected distributions.
- Opera 9.24 security update
Opera was updated to version 9.24 to fix numerous defects including some security problems. (CVE-2007-5540,CVE-2007-5541)
Opera is on SUSE Linux 10.0, 10.1, openSUSE 10.2 and 10.3 and was updated there.
- util-linux mount setuid/setgid checking problem
Ludwig Nussel identified a problem in the handling of "user" mounts in util-linux. The return value of setuid() was not checked.
This can only trigger if a mount point is listed as "user" in /etc/fstab and if helpers are called. But those helpers have to be setuid root anyway, so this problem is only academic in the current setup and so just considered a regular bug.
We have fixed this bug for openSUSE 10.3 and future products.
This issue is tracked by Mitre CVE ID CVE-2007-5191.
- util-linux mount buffer overflow
Cryptographic enhancements in the losetup code in /sbin/mount done by us during the openSUSE 10.3 development introduced a stack based buffer overflow, which could potentially be used to execute code.
We have a released an updated util-linux package for openSUSE 10.3 fixing this bug.
This would have likely have been caught by the stack overflow protection mechanisms, but we have not cross checked this.
- openssh X11 cookie and SIGALRM fixes
A bug in was fixed in openssh's X11 cookie handling code. It does not properly handle the situation when an untrusted cookie cannot be created and uses a trusted X11 cookie instead. This allows attackers to violate the intended policy and gain privileges by causing an X client to be treated as trusted. (CVE-2007-4752)
Additionally this update fixes a bug introduced with the last security update for openssh. When the SSH daemon wrote to stderr (for instance, to warn about the presence of a deprecated option like PAMAuthenticationViaKbdInt in its configuration file), SIGALRM was blocked for SSH sessions. This resulted in problems with processes which rely on SIGALRM, such as ntpdate. ______________________________________________________________________________
2) Pending Vulnerabilities, Solutions, and Work-Arounds
None listed this week. ______________________________________________________________________________
3) Authenticity Verification and Additional Information
- Announcement authenticity verification:
SUSE security announcements are published via mailing lists and on Web sites. The authenticity and integrity of a SUSE security announcement is guaranteed by a cryptographic signature in each announcement. All SUSE security announcements are published with a valid signature.
To verify the signature of the announcement, save it as text into a file and run the command
gpg --verify <file>
replacing <file> with the name of the file containing the announcement. The output for a valid signature looks like:
gpg: Signature made <DATE> using RSA key ID 3D25D3D9 gpg: Good signature from "SuSE Security Team firstname.lastname@example.org"
where <DATE> is replaced by the date the document was signed.
If the security team's key is not contained in your key ring, you can import it from the first installation CD. To import the key, use the command
gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc
- Package authenticity verification:
SUSE update packages are available on many mirror FTP servers all over the world. While this service is considered valuable and important to the free and open source software community, the authenticity and integrity of a package needs to be verified to ensure that it has not been tampered with.
The internal RPM package signatures provide an easy way to verify the authenticity of an RPM package. Use the command
rpm -v --checksig <file.rpm>
to verify the signature of the package, replacing <file.rpm> with the filename of the RPM package downloaded. The package is unmodified if it contains a valid signature from email@example.com with the key ID 9C800ACA.
This key is automatically imported into the RPM database (on RPMv4-based distributions) and the gpg key ring of 'root' during installation. You can also find it on the first installation CD and included at the end of this announcement.
- SUSE runs two security mailing lists to which any interested party may subscribe:
firstname.lastname@example.org - General Linux and SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an e-mail to email@example.com.
firstname.lastname@example.org - SUSE's announce-only mailing list. Only SUSE's security announcements are sent to this list. To subscribe, send an e-mail to email@example.com.
===================================================================== SUSE's security contact is firstname.lastname@example.org or email@example.com. The firstname.lastname@example.org public key is listed below. ===================================================================== ______________________________________________________________________________
The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. In particular, the clear text signature should show proof of the authenticity of the text.
SUSE Linux Products GmbH provides no warranties of any kind whatsoever with respect to the information contained in this security advisory.
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