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>E.208. Release 7.4.19</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2008-01-07</P
></DIV
><P
> This release contains a variety of fixes from 7.4.18,
including fixes for significant security issues.
For information about new features in the 7.4 major release, see
<A
HREF="release-7-4.html"
>Section E.227</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN140935"
>E.208.1. Migration to Version 7.4.19</A
></H2
><P
> A dump/restore is not required for those running 7.4.X. However,
if you are upgrading from a version earlier than 7.4.11,
see <A
HREF="release-7-4-11.html"
>Section E.216</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN140939"
>E.208.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Prevent functions in indexes from executing with the privileges of
the user running <TT
CLASS="COMMAND"
>VACUUM</TT
>, <TT
CLASS="COMMAND"
>ANALYZE</TT
>, etc (Tom)
</P
><P
> Functions used in index expressions and partial-index
predicates are evaluated whenever a new table entry is made. It has
long been understood that this poses a risk of trojan-horse code
execution if one modifies a table owned by an untrustworthy user.
(Note that triggers, defaults, check constraints, etc. pose the
same type of risk.) But functions in indexes pose extra danger
because they will be executed by routine maintenance operations
such as <TT
CLASS="COMMAND"
>VACUUM FULL</TT
>, which are commonly performed
automatically under a superuser account. For example, a nefarious user
can execute code with superuser privileges by setting up a
trojan-horse index definition and waiting for the next routine vacuum.
The fix arranges for standard maintenance operations
(including <TT
CLASS="COMMAND"
>VACUUM</TT
>, <TT
CLASS="COMMAND"
>ANALYZE</TT
>, <TT
CLASS="COMMAND"
>REINDEX</TT
>,
and <TT
CLASS="COMMAND"
>CLUSTER</TT
>) to execute as the table owner rather than
the calling user, using the same privilege-switching mechanism already
used for <TT
CLASS="LITERAL"
>SECURITY DEFINER</TT
> functions. To prevent bypassing
this security measure, execution of <TT
CLASS="COMMAND"
>SET SESSION
AUTHORIZATION</TT
> and <TT
CLASS="COMMAND"
>SET ROLE</TT
> is now forbidden within a
<TT
CLASS="LITERAL"
>SECURITY DEFINER</TT
> context. (CVE-2007-6600)
</P
></LI
><LI
><P
> Repair assorted bugs in the regular-expression package (Tom, Will Drewry)
</P
><P
> Suitably crafted regular-expression patterns could cause crashes,
infinite or near-infinite looping, and/or massive memory consumption,
all of which pose denial-of-service hazards for applications that
accept regex search patterns from untrustworthy sources.
(CVE-2007-4769, CVE-2007-4772, CVE-2007-6067)
</P
></LI
><LI
><P
> Require non-superusers who use <TT
CLASS="FILENAME"
>/contrib/dblink</TT
> to use only
password authentication, as a security measure (Joe)
</P
><P
> The fix that appeared for this in 7.4.18 was incomplete, as it plugged
the hole for only some <TT
CLASS="FILENAME"
>dblink</TT
> functions. (CVE-2007-6601,
CVE-2007-3278)
</P
></LI
><LI
><P
> Fix planner failure in some cases of <TT
CLASS="LITERAL"
>WHERE false AND var IN
(SELECT ...)</TT
> (Tom)
</P
></LI
><LI
><P
> Fix potential crash in <CODE
CLASS="FUNCTION"
>translate()</CODE
> when using a multibyte
database encoding (Tom)
</P
></LI
><LI
><P
> Fix PL/Python to not crash on long exception messages (Alvaro)
</P
></LI
><LI
><P
> <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
> parser fixes (Michael)
</P
></LI
><LI
><P
> Make <TT
CLASS="FILENAME"
>contrib/tablefunc</TT
>'s <CODE
CLASS="FUNCTION"
>crosstab()</CODE
> handle
NULL rowid as a category in its own right, rather than crashing (Joe)
</P
></LI
><LI
><P
> Fix <TT
CLASS="TYPE"
>tsvector</TT
> and <TT
CLASS="TYPE"
>tsquery</TT
> output routines to
escape backslashes correctly (Teodor, Bruce)
</P
></LI
><LI
><P
> Fix crash of <CODE
CLASS="FUNCTION"
>to_tsvector()</CODE
> on huge input strings (Teodor)
</P
></LI
><LI
><P
> Require a specific version of <SPAN
CLASS="PRODUCTNAME"
>Autoconf</SPAN
> to be used
when re-generating the <TT
CLASS="COMMAND"
>configure</TT
> script (Peter)
</P
><P
> This affects developers and packagers only. The change was made
to prevent accidental use of untested combinations of
<SPAN
CLASS="PRODUCTNAME"
>Autoconf</SPAN
> and <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> versions.
You can remove the version check if you really want to use a
different <SPAN
CLASS="PRODUCTNAME"
>Autoconf</SPAN
> version, but it's
your responsibility whether the result works or not.
</P
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