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gzip Multiple Vulnerabilities
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Secunia Advisory:
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SA21996
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Release Date:
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2006-09-20
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Popularity:
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10,262 views
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Critical:
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Moderately critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Unpatched
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| Software: | gzip 1.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2006-4334
CVE-2006-4335
CVE-2006-4336
CVE-2006-4337
CVE-2006-4338
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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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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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