Mono 'loader.c' Library Loading Local Privilege Escalation Vulnerability

2010-11-19 / 2010-11-20
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-Other


Ogólna skala CVSS: 6.9/10
Znaczenie: 10/10
Łatwość wykorzystania: 3.4/10
Wymagany dostęp: Lokalny
Złożoność ataku: Średnia
Autoryzacja: Nie wymagana
Wpływ na poufność: Pełny
Wpływ na integralność: Pełny
Wpływ na dostępność: Pełny

User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-us) AppleWebKit/533.18.1 (KHTML, like Gecko) Version/5.0.2 Safari/533.18.5 http://www.mono-project.com/DllNotFoundException explains that the mono runtime searches the current working directory for DLLs. This opens a serious security hole. Malicious code can be given the same name as a DLL and left in a directory the user might visit. Also, it means that no mono application can safely set the current working directory. Microsoft themselves addressed this issue in Windows http://msdn.microsoft.com/en-us/library/ms682586(v=VS.85).aspx It's a well known "dummies" question for Unix why you must not have "." on your path http://www.unix.com/unix-dummies-questions-answers/22806-why-bad-idea-insert-dot-path.html Mono is exposing users to these same old hat problems. (As a related problem, many mono programs seem to *assume* that they will be run with the CWD set to their installed directory, and break if it isn't.) Reproducible: Always Steps to Reproduce: 1. 2. 3.

Referencje:

https://github.com/mono/mono/commit/8e890a3bf80a4620e417814dc14886b1bbd17625
http://lists.ximian.com/pipermail/mono-patches/2010-October/177900.html
https://bugzilla.novell.com/show_bug.cgi?id=641915
http://www.securityfocus.com/bid/44810
http://www.mono-project.com/Vulnerabilities#Mono_Runtime_Insecure_Native_Library_Loading
http://secunia.com/advisories/42174
http://marc.info/?l=oss-security&m=128941802415318&w=2
http://marc.info/?l=oss-security&m=128939912716499&w=2
http://marc.info/?l=oss-security&m=128939873515821&w=2


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