oss-sec mailing list archives
Re: ***UNCHECKED*** [oss-security] UnRAR: directory traversal + memory safety bugs
From: Marcus Meissner <meissner () suse de>
Date: Fri, 18 Aug 2017 15:24:50 +0200
On Tue, Aug 15, 2017 at 12:39:48AM +0200, Jakub Wilk wrote:
(I'm not sure UnRAR bugs are on-topic here. UnRAR is not free software, even though the source is available. But the last time UnRAR was discussed nobody objected, so hey, let me try too.) I found directory traversal and a few memory safety bugs in UnRAR 5.5.6. These bugs have been fixed in UnRAR 5.5.7. The memory safety bugs were found using American Fuzzy Lop. Here are details of the bugs: * Directory traversal The PoC (traversal.rar) contains two symlinks and a regular file: cur -> . cur/par -> .. par/moo This setup defeats UnRAR's directory traversal protections: $ ls ../moo /bin/ls: cannot access '../moo': No such file or directory $ unrar x traversal.rar ... Extracting cur OK Extracting cur/par OK Extracting par/moo OK All OK $ ls ../moo ../moo The code that was used to generate the PoC is available here: https://github.com/jwilk/path-traversal-samples
The directory traversal has been assigned CVE-2017-12938. (My request just yielded this 1 CVE, i replied requesting also for the other issues.) Ciao, Marcus
Current thread:
- UnRAR: directory traversal + memory safety bugs Jakub Wilk (Aug 14)
- Re: ***UNCHECKED*** [oss-security] UnRAR: directory traversal + memory safety bugs Marcus Meissner (Aug 18)
- Re: ***UNCHECKED*** [oss-security] UnRAR: directory traversal + memory safety bugs Marcus Meissner (Aug 18)
- Re: Re: ***UNCHECKED*** [oss-security] UnRAR: directory traversal + memory safety bugs Marcus Meissner (Aug 18)