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Bug 1635888 - (CVE-2018-17828) CVE-2018-17828 zziplib: directory traversal in unzzip_cat in the bins/unzzipcat-mem.c
CVE-2018-17828 zziplib: directory traversal in unzzip_cat in the bins/unzzipc...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180925,repor...
: Security
Depends On: 1635889 1635890 1641635
Blocks: 1635891
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Reported: 2018-10-03 16:36 EDT by Laura Pardo
Modified: 2018-10-24 14:06 EDT (History)
2 users (show)

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It was discovered that zziplib is vulnerable to a directory traversal flaw in most of its unzip binaries, including unzip-mem, unzzipcat-mem, unzzipcat-big, unzzipcat-mix, and unzzipcat-zip. An attacker may use this flaw to write files outside the intended target directory, overwriting existing files, or creating new ones.
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Description Laura Pardo 2018-10-03 16:36:19 EDT 
A flaw was found in ZZIPlib 0.13.69. A directory traversal vulnerability allows attackers to overwrite arbitrary files via a .. (dot dot) in a zip file, because of the function unzzip_cat in the bins/unzzipcat-mem.c file. 


References:
https://github.com/gdraheim/zziplib/issues/62
Comment 1 Laura Pardo 2018-10-03 16:36:47 EDT 
Created zziplib tracking bugs for this issue:

Affects: fedora-all [bug 1635889]
Comment 4 Riccardo Schirone 2018-10-22 07:17:04 EDT 
The same flaw is present in unzzipcat-big.c, unzzipcat-mix.c and unzzipcat-zip.c.
Comment 5 Riccardo Schirone 2018-10-22 07:46:14 EDT 
The same problem is also present in unzip-mem.c.

Proposed patch for unzip-mem.c:
https://github.com/gdraheim/zziplib/files/2482517/patch.txt
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