#VU37775 Input validation error in fossil - CVE-2017-17459

Vulnerability identifier: #VU37775

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-17459

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
fossil
Other software / Other software solutions

Vendor: www.fossil-scm.org

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

http_transport.c in Fossil before 2.4, when the SSH sync protocol is used, allows user-assisted remote attackers to execute arbitrary commands via an ssh URL with an initial dash character in the hostname, a related issue to CVE-2017-9800, CVE-2017-12836, CVE-2017-12976, CVE-2017-14176, CVE-2017-16228, CVE-2017-1000116, and CVE-2017-1000117.

Mitigation
Install update from vendor's website.

Vulnerable software versions

fossil: 2.2

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External links
https://bugzilla.opensuse.org/show_bug.cgi?id=1071709
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BLAFCQGE7C5UMX75LESNUMKTXTURUVQM/
https://www.fossil-scm.org/xfer/doc/trunk/www/changes.wiki#v2_4
https://www.fossil-scm.org/xfer/info/1f63db591c77108c

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.