CVE-2015-4334

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-12-07 · updated 2026-06-17
Weakness: CWE-200

Description

The default configuration of SGOS in Blue Coat ProxySG before 6.2.16.5, 6.5 before 6.5.7.1, and 6.6 before 6.6.2.1 forwards authentication challenges from upstream origin content servers (OCS) when used in an explicit proxy deployment, which makes it easier for remote attackers to obtain sensitive information via a 407 (aka Proxy Authentication Required) HTTP status code, as demonstrated when using NTLM authentication.

Affected products

Symantec Proxysg Firmware: from 6.2 through 6.2.16.4; from 6.5 through 6.5.7.0; from 6.6 through 6.6.2.0

References

http://www.securitytracker.com/id/1032149
https://bto.bluecoat.com/security-advisory/sa93
https://twitter.com/bugch3ck/status/591492380294979585
http://www.securitytracker.com/id/1032149
https://bto.bluecoat.com/security-advisory/sa93
https://twitter.com/bugch3ck/status/591492380294979585

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