Date: Wed, 08 Apr 2015 14:06:20 +0000 From: "Thomas B. Rücker" <thomas@...cker.fi> To: oss-security@...ts.openwall.com Subject: Re: CVE Request for Icecast 2.3.3, 2.4.0, 2.4.1, fixed in 2.4.2 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 [resending as it seems Thunderbird/Enigmail breaks my signature] A new version of Icecast was released, following the discovery of a remote denial of service vulnerability by Juliane Holzt earlier today. Affected Icecast versions: 2.3.3(first release with stream_auth) 2.4.0 2.4.1 Fix released in: 2.4.2 We do not release fixes for: 2.3.3: EOL 2.4.0: not necessary, as 2.4.1 was a bugfix release for 2.4.0. On 04/08/2015 12:52 PM, "Thomas B. Rücker" wrote: > > Today we became aware of a bug in the Icecast code handling source > client URL-authentication and are releasing a security fix. > The bug was discovered by Juliane Holzt, who we'd like to thank for > bringing this to our attention and providing us with further details. [...] > The bug can only be triggered if "stream_auth" is being used, > for example: > <mount> > <mount-name>/test.ogg</mount-name> > <authentication type="url"> > <option name="stream_auth" value="http://localhost/auth"/> > </authentication> > </mount> > > This means, that all installations that use a default configuration are > NOT affected.The default configuration only uses <source-password>. > Neither are simple mountpoints affected that use <password>. > > A workaround, if installing an updated package is not possible, is to > disable "stream_auth"and use <password> instead. > > As far as we understand the bug only leads to a simple remote denial of > service. The underlying issue is a null pointer dereference. For > clarity: No remote code execution should be possible, server just > segfaults. > > Proof of concept: > curl "http://example.org:8000/admin/killsource?mount=/test.ogg" > If the server is configured as above, then it will segfault.A source > client does not need to be connected to that mount point. > As Juliane points out: "This only happens when making a request WITHOUT > login credentials." > This means, that sadly exploiting this does not require any > authentication, just the knowledge of a mount point configured with > stream_auth. > > Original Debian bug report: > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=782120 > > Xiph.org ticket: > https://trac.xiph.org/ticket/2191 > > Sources: > http://downloads.xiph.org/releases/icecast/icecast-2.4.2.tar.gz > SHA256 aa1ae2fa364454ccec61a9247949d19959cb0ce1b044a79151bf8657fd673f4f > git-tag: release-2.4.2 [...] > We are requesting a CVE ID through oss-security and I will update the > ticket once we have received it. Thanks in advance Thomas B. Ruecker Icecast maintainer -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlUlNZIACgkQfkVKO9VkYGnSegCaAyvKVDcNyp1tNROYstDD5cuB 4KcAnil31ZFpwYLKoiAm9AwJdgtknjPn =cj1f -----END PGP SIGNATURE-----
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