Date: Wed, 3 Jun 2015 14:43:35 -0400 From: Joshua Smith <jsmith@...l.wvnet.edu> To: oss-security@...ts.openwall.com Subject: Re: Re: Stack out of bounds read access in uudecode / sharutils On Wed, Jun 03, 2015 at 08:25:37PM +0200, Hanno Böck wrote: > Hi CVE-team, > > On Tue, 2 Jun 2015 22:35:02 -0400 (EDT) > cve-assign@...re.org wrote: > > > What are the realistic scenarios in which this has a security impact? > > > > For example, can any of these occur on actual systems? > > > > 1. The attacker e-mails a uuencoded file to their own mailbox on a > > web-based mail service. This service has a feature in which decoded > > data is presented to the recipient. (The server operates on the data > > with the uudecode program, not with any other implementation of the > > uudecode algorithm. The attacker gains read access to unintended parts > > of the server's memory.) > > > > 2. A web site allows users to do HTTP uploads of data in uuencoded > > format, and supports requests for decoded versions of the data. Same > > parenthesized description as above. > > > > 3. The attacker composes a news article with crafted uuencoded data > > and posts it to the alt.sources Usenet newsgroup. The attacker is > > subscribed to this newsgroup in their own account on a web-based > > Usenet news reading service. Same parenthesized description as above. > > To answer these questions to the best of my knowledge: I don't know. > > This is a question I think I can answer in a very general fashion. I > find and report these out of bounds vulns very often. I can > confirm that in your described scenarios an attacker could trigger an > out of bounds read. If that can in anyway be used to exfiltrate data or > other attacks: I don't know. In this case it's probably unlikely, > because as you can see the oob read is just one byte. > > Analyzing the impact of these kinds of vulns would require digging and > understanding the code in detail by someone skilled in memory > corruption exploitation (that means: not me). > > What I can say is that many very similar issues I reported in the past > got CVEs (lately e.g. in wireshark and curl). And there'll probably be > a lot more in the near future. I started trying to write up reports for > all issues of these kinds I reported once they got fixed. > > If you prefere not to be bothered about out of bounds issues with > unknown impact any more I am fine with that and will stop cc-ing. Also > - if the people on oss-security feel that my reports on these > minor issues are too frequently please tell me and I'll stop sending > them. But in the past I had the impression it's apprechiated and solar > designer wants as much info as possible in the oss-security archives > in case external sources vanish. > > > cu, > -- > Hanno Böck > http://hboeck.de/ > > mail/jabber: hanno@...eck.de > GPG: BBB51E42 Not that my opinion matters but I enjoy reading your posts on this and similar vulnerabilities you have discovered. -- Joshua Smith Lead Systems Administrator WVNET Montani Semper Liberi
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