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TITLE:
gzip Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA21996

VERIFY ADVISORY:
http://secunia.com/advisories/21996/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
gzip 1.x
http://secunia.com/product/4220/

DESCRIPTION:
Tavis Ormandy has reported some vulnerabilities in gzip, which can be
exploited by malicious people to cause a DoS (Denial of Service) and
potentially compromise a vulnerable system.

1) A boundary error within the "make_table()" function in unlzh.c can
be used to modify certain stack data. This can be exploited to cause a
DoS and potentially allows to execute arbitrary code by e.g. tricking
a user or automated system into unpacking a specially crafted archive
file.

2) A buffer underflow exists within the "build_tree()" function in
unpack.c, which can be exploited to cause a DoS and potentially
allows to execute arbitrary code by e.g. tricking a user  or
automated system into unpacking a specially crafted "pack" archive
file.

3) A buffer overflow within the "make_table()" function of gzip's LZH
support can be exploited to cause a DoS and potentially to compromise
a vulnerable system by e.g. tricking a user or automated system into
unpacking an archive containing a specially crafted decoding table.

4) A NULL pointer dereference within the "huft_build()" function and
an infinite loop within the LZH handling can be exploited to cause a
DoS by e.g. tricking a user or automated system into unpacking a
specially crafted archive file.

The vulnerabilities have been reported in version 1.3.5. Other
versions may also be affected.

SOLUTION:
Do not unpack untrusted archive files.

PROVIDED AND/OR DISCOVERED BY:
Tavis Ormandy, Google Security Team

ORIGINAL ADVISORY:
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=204676

OTHER REFERENCES:
US-CERT VU#554780:
http://www.kb.cert.org/vuls/id/554780

US-CERT VU#381508:
http://www.kb.cert.org/vuls/id/381508

US-CERT VU#773548:
http://www.kb.cert.org/vuls/id/773548

US-CERT VU#933712:
http://www.kb.cert.org/vuls/id/933712

US-CERT VU#596848
http://www.kb.cert.org/vuls/id/596848

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