High severity · published Jan 10, 2017
CVE-2016-6287
The "http-client" egg always used a HTTP_PROXY environment variable to determine whether HTTP traffic should be routed via a proxy, even when running as a CGI process
7.5
CVSS
1.5%
EPSS
No
On KEV
Description
The "http-client" egg always used a HTTP_PROXY environment variable to determine whether HTTP traffic should be routed via a proxy, even when running as a CGI process. Under several web servers this would mean a user-supplied "Proxy" header could allow an attacker to direct all HTTP requests through a proxy (also known as a "httpoxy" attack). This affects all versions of http-client before 0.10.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HT
Http-client · Call-cc
through 0.9 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-6287
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-6287
Mitigation
http://lists.gnu.org/archive/html/chicken-announce/2016-07/msg00000.html
Third Party Advisory
http://www.securityfocus.com/bid/92105
More from Http-client
7.5
CVE-2016-6286
The "spiffy-cgi-handlers" egg would convert a nonexistent "Proxy" header to the HTTP_PROXY environment variable, which would allow attackers to direct CGI programs which use this…