Full Disclosure mailing list archives
Re: Fwd: VSFTPD Remote Heap Overrun (low severity)
From: Daniel J Walsh <dwalsh () redhat com>
Date: Mon, 12 Dec 2011 12:13:30 -0500
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 12/12/2011 11:58 AM, Ramon de C Valle wrote:
Ramon, not sure I understand, what are you trying to prevent here?Hello Dan, vsftpd processes open locale files from the "/usr/share/zoneinfo" directory, which are expected to have the "locale_t" type. A chrooted user can create a specially-crafted locale file in "/home/<user>/usr/share/zoneinfo" directory to try exploiting this glibc vulnerability. However, the specially-crafted locale file created will have the "user_home_t" type and not the "locale_t". SELinux rules for vsftpd (i.e. ftpd_t) allowing only opening locale files from "usr_t" directories with "locale_t" type should have completely mitigated this.
But how can I state that ftp has access to the users homedir and not allow access to user_home_t? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk7mNjoACgkQrlYvE4MpobNg6gCgr/KHGKC09Li1BwoFthepsEor KYEAn3/HJ8frW/21GiZfw/tL9waf7Irx =f5NM -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- VSFTPD Remote Heap Overrun (low severity) HI-TECH . (Dec 02)
- <Possible follow-ups>
- Re: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 12)
- Message not available
- Fwd: VSFTPD Remote Heap Overrun (low severity) HI-TECH . (Dec 09)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) GloW - XD (Dec 09)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) GloW - XD (Dec 09)
- Message not available
- Re: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 12)
- Fwd: VSFTPD Remote Heap Overrun (low severity) HI-TECH . (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Daniel J Walsh (Dec 13)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Daniel J Walsh (Dec 13)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Valdis . Kletnieks (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) lists (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Valdis . Kletnieks (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Valdis . Kletnieks (Dec 12)
- Fwd: VSFTPD Remote Heap Overrun (low severity) HI-TECH . (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 12)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Daniel J Walsh (Dec 13)
- Re: Fwd: VSFTPD Remote Heap Overrun (low severity) Ramon de C Valle (Dec 13)