Bug 1224909 (CVE-2015-3200) - CVE-2015-3200 lighttpd: log injection via malformed base64 string in Authentication header
Summary: CVE-2015-3200 lighttpd: log injection via malformed base64 string in Authenti...
Alias: CVE-2015-3200
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1224910 1224911
TreeView+ depends on / blocked
Reported: 2015-05-26 07:54 UTC by Martin Prpič
Modified: 2019-09-29 13:33 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2019-06-08 02:41:24 UTC

Attachments (Terms of Use)

Description Martin Prpič 2015-05-26 07:54:29 UTC
A flaw was found in Lighttpd:

When basic HTTP authentication base64 string does not contain colon character (or contains it after NULL byte - can be inserted inside base64 encoding), then that situation is logged with a string ": is missing in " and the simply decoded base64 string. This means that new lines, NULL byte and everything else can be encoded with base64 and are then inserted to logs as they are after decoding.

For example header "Authorization: Basic dGVzdAAKMjEwMC0wMS0wMSAwMDowMDowMDogKG1hZ2ljLmMuODU5KSBJVCdTIFRIRSBFTkQgT0YgVEhFIFdPUkxEIQ==" results in two log lines:

2015-05-14 12:55:54: (http_auth.c.859) : is missing in test
2100-01-01 00:00:00: (magic.c.859) IT'S THE END OF THE WORLD

Upstream issue:


External References:


Comment 1 Martin Prpič 2015-05-26 07:54:58 UTC
Created lighttpd tracking bugs for this issue:

Affects: fedora-all [bug 1224910]
Affects: epel-all [bug 1224911]

Comment 2 Vasyl Kaigorodov 2015-06-01 11:36:29 UTC

Red Hat would like to thank Jaanus Kääp for reporting this issue.

Comment 3 W. Michael Petullo 2015-10-28 01:02:14 UTC
Should someone close this bug?

Comment 4 Product Security DevOps Team 2019-06-08 02:41:24 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

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