CVE-2019-11072

Vulnerability Description

lighttpd before 1.4.54 has a signed integer overflow, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a malicious HTTP GET request, as demonstrated by mishandling of /%2F? in burl_normalize_2F_to_slash_fix in burl.c. NOTE: The developer states "The feature which can be abused to cause the crash is a new feature in lighttpd 1.4.50, and is not enabled by default. It must be explicitly configured in the config file (e.g. lighttpd.conf). Certain input will trigger an abort() in lighttpd when that feature is enabled. lighttpd detects the underflow or realloc() will fail (in both 32-bit and 64-bit executables), also detected in lighttpd. Either triggers an explicit abort() by lighttpd. This is not exploitable beyond triggering the explicit abort() with subsequent application exit.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• http://www.securityfocus.com/bid/107907Third Party AdvisoryVDB Entry
• https://github.com/lighttpd/lighttpd1.4/commit/32120d5b8b3203fc21ccb9eafb0eaf824PatchThird Party Advisory
• https://redmine.lighttpd.net/issues/2945ExploitPatchThird Party Advisory
• http://www.securityfocus.com/bid/107907Third Party AdvisoryVDB Entry
• https://github.com/lighttpd/lighttpd1.4/commit/32120d5b8b3203fc21ccb9eafb0eaf824PatchThird Party Advisory
• https://redmine.lighttpd.net/issues/2945ExploitPatchThird Party Advisory