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Perl is a high-level programming language commonly used for system
administration utilities and web programming. The Perl CGI module
provides resources for preparing and processing Common Gateway
Interface (CGI) based HTTP requests and responses.
It was found that the Perl CGI module used a hard-coded value for the
MIME boundary string in multipart/x-mixed-replace content. A remote
attacker could possibly use this flaw to conduct an HTTP response
splitting attack via a specially-crafted HTTP request. (CVE-2010-2761)
A CRLF injection flaw was found in the way the Perl CGI module
processed a sequence of non-whitespace preceded by newline characters
in the header. A remote attacker could use this flaw to conduct an
HTTP response splitting attack via a specially-crafted sequence of
characters provided to the CGI module. (CVE-2010-4410)
It was found that certain Perl string manipulation functions (such as
uc() and lc()) failed to preserve the taint bit. A remote attacker
could use this flaw to bypass the Perl taint mode protection mechanism
in scripts that use the affected functions to process tainted input.
These packages upgrade the CGI module to version 3.51. Refer to the
CGI module's Changes file, linked to in the References, for a full
list of changes.
This update also fixes the following bugs :
- When using the 'threads' module, an attempt to send a
signal to a thread that did not have a signal handler
specified caused the perl interpreter to terminate
unexpectedly with a segmentation fault. With this
update, the 'threads' module has been updated to
upstream version 1.82, which fixes this bug. As a
result, sending a signal to a thread that does not have
the signal handler specified no longer causes perl to
- Prior to this update, the perl packages did not require
the Digest::SHA module as a dependency. Consequent to
this, when a user started the cpan command line
interface and attempted to download a distribution from
CPAN, they may have been presented with the following
CPAN: checksum security checks disabled because Digest::SHA not
installed. Please consider installing the Digest::SHA module.
This update corrects the spec file for the perl package to require the
perl-Digest-SHA package as a dependency, and cpan no longer displays
the above message.
- When using the 'threads' module, continual creation and
destruction of threads could cause the Perl program to
consume an increasing amount of memory. With this
update, the underlying source code has been corrected to
free the allocated memory when a thread is destroyed,
and the continual creation and destruction of threads in
Perl programs no longer leads to memory leaks.
- Due to a packaging error, the perl packages did not
include the 'NDBM_File' module. This update corrects
this error, and 'NDBM_File' is now included as expected.
- Prior to this update, the prove(1) manual page and the
'prove --help' command listed '--fork' as a valid
command line option. However, version 3.17 of the
Test::Harness distribution removed the support for the
fork-based parallel testing, and the prove utility thus
no longer supports this option. This update corrects
both the manual page and the output of the 'prove
--help' command, so that '--fork' is no longer included
in the list of available command line options.
Users of Perl, especially those of Perl threads, are advised to
upgrade to these updated packages, which correct these issues.
See also :
Update the affected packages.
Risk factor :
Medium / CVSS Base Score : 5.0
Family: Scientific Linux Local Security Checks
Nessus Plugin ID: 61044 ()
CVE ID: CVE-2011-1487