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
Created lighttpd tracking bugs for this issue:
Affects: fedora-all [bug 1224910]
Affects: epel-all [bug 1224911]
Red Hat would like to thank Jaanus Kääp for reporting this issue.
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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.