FreeBSD Security Advisory FreeBSD-SA-09:16.rtld

[Jamie Landeg Jones]

> Sorry, this might seem a stupid question, but...
> In several places I read that FreeBSD 6.x is NOT affected; however, I 
> heard some people discussing how to apply the patch to such systems.
> So, I'd like to know for sure: is 6.x affected? Is another patch on the 
> way for it?
>
>   bye & Thanks
> 	av.

The change that introduced the bug was made as follows:

 | Revision 1.124: download - view: text, markup, annotated - select for diffs
 | Thu May 17 18:00:27 2007 UTC (2 years, 6 months ago) by csjp
 | Branches: MAIN
 | CVS tags: RELENG_7_BP, RELENG_7_0_BP, RELENG_7_0_0_RELEASE, RELENG_7_0
 | Branch point for: RELENG_7
 | Diff to: previous 1.123: preferred, colored
 | Changes since revision 1.123: +20 -10 lines
 | 
 | In the event a process is tainted (setuid/setgid binaries), un-set any
 | potentially dangerous environment variables all together. It should be
 | noted that the run-time linker will not honnor these environment variables
 | if the process is tainted currently. However, once a child of the tainted
 | process calls setuid(2), it's status as being tainted (as defined by
 | issetugid(2)) will be removed. This could be problematic because
 | subsequent activations of the run-time linker could honnor these
 | dangerous variables.
 | 
 | This is more of an anti foot-shot mechanism, there is nothing I am
 | aware of in base that does this, however there may be third party
 | utilities which do, and there is no real negative impact of clearing
 | these environment variables.
 | 
 | Discussed on:	secteam
 | Reviewed by:	cperciva
 | PR:		kern/109836
 | MFC after:	2 weeks

This was also ported MFC'd into 6.3 onwards:

 | Revision 1.106.2.7: download - view: text, markup, annotated - select for diffs
 | Sat Jul 14 19:04:00 2007 UTC (2 years, 4 months ago) by csjp
 | Branches: RELENG_6
 | CVS tags: RELENG_6_4_BP, RELENG_6_3_BP, RELENG_6_3_0_RELEASE, RELENG_6_3
 | Branch point for: RELENG_6_4
 | Diff to: previous 1.106.2.6: preferred, colored; branchpoint 1.106: preferred, colored; next MAIN 1.107: preferred, colored
 | Changes since revision 1.106.2.6: +20 -10 lines
 | 
 | MFC rtld.c revision 1.124
 | 
 | Unset potentially harmful environment variables.
 | 
 | Discussed on:	seacteam
 | PR:		kern/109836


So, yes, FreeBSD 6.3-RELEASE upwards are affected - FreeBSD 6.2 isn't.