CVE-2018-1000005 Information disclosure in n/a
Out-of-bounds read in libcurl HTTP/2 trailer handling allows attackers to cause crashes or disclose sensitive memory contents.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-1000005?
CVE-2018-1000005 is a critical vulnerability in Canonical Ubuntu Linux, published on 24 Jan 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.
Weakness: CWE-125
Which versions are affected by CVE-2018-1000005?
It affects 3 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Haxx Libcurl.
How do I fix CVE-2018-1000005?
Upgrade to a fixed version.
Is CVE-2018-1000005 being exploited?
There is no known exploitation of CVE-2018-1000005 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as ALPINE-CVE-2018-1000005, CURL-CVE-2018-1000005, DEBIAN-CVE-2018-1000005, GHSA-cj8j-r7q8-xg4f, UBUNTU-CVE-2018-1000005.