Date: Wed, 30 May 2012 17:42:59 -0300 From: Felipe Pena <felipensp@...il.com> To: Kurt Seifried <kseifried@...hat.com> Cc: oss-security@...ts.openwall.com, Tomas Hoger <thoger@...hat.com> Subject: Re: CVE id request: Multiple buffer overflow in unixODBC 2012/5/30 Kurt Seifried <kseifried@...hat.com>: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 05/30/2012 11:40 AM, Felipe Pena wrote: >> Hi all, >> >> 2012/5/30 Kurt Seifried <kseifried@...hat.com>: >>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >>> >>> On 05/30/2012 02:07 AM, Tomas Hoger wrote: >>>> On Tue, 29 May 2012 09:42:42 -0300 Felipe Pena wrote: >>>> >>>>> Multiple buffer overflow in unixODBC >>>>> =========================== >>>>> >>>>> The library unixODBC doesn't check properly the input from >>>>> FILEDSN=, DRIVER= options in the DSN, which causes buffer >>>>> overflow when passed to the SQLDriverConnect() function. >>>> >>>> Reports like this - covering bugs in parsing of the >>>> configuration parameters (i.e. generally trusted input) - >>>> should include some reasoning why these should be considered >>>> security. Nothing obvious not intended to break PHP safe_mode >>>> comes to mind. >>>> >>> >>> Ahh my bad, I misunderstood this to be options that could be >>> passed by the program as a standard part of the query, and thus >>> controlled by the attacker. If this is indeed limited to >>> configuration files and there are not extenuating circumstances >>> that allow exploitation I will have to REJECT these CVEs. >>> >> >> It isn't limited to the configuration files. Such input can be >> passed to the `isql' interactive tool that come together unixODBC. >> The same string can be used to connect through PHP PDO, for >> example. >> >> $ pwd .../unixodbc/src/unixODBC-2.3.1/exe $ ./isql >> "FILEDSN=$(python -c "print 'A'*10000");UID=user" -k Segmentation >> fault >> >> If it isn't characterized a security issue I'm sorry. >> >> Thanks. >> > > Is this something that an attacker can typically control, or does the > PHP author need to write code that does this? > Nop. Beyond the isql one, I can't find a way to control externally the DSN. -- Regards, Felipe Pena
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