CVE-2024-9681

NameCVE-2024-9681
DescriptionWhen curl is asked to use HSTS, the expiry time for a subdomain might overwrite a parent domain's cache entry, making it end sooner or later than otherwise intended. This affects curl using applications that enable HSTS and use URLs with the insecure `HTTP://` scheme and perform transfers with hosts like `x.example.com` as well as `example.com` where the first host is a subdomain of the second host. (The HSTS cache either needs to have been populated manually or there needs to have been previous HTTPS accesses done as the cache needs to have entries for the domains involved to trigger this problem.) When `x.example.com` responds with `Strict-Transport-Security:` headers, this bug can make the subdomain's expiry timeout *bleed over* and get set for the parent domain `example.com` in curl's HSTS cache. The result of a triggered bug is that HTTP accesses to `example.com` get converted to HTTPS for a different period of time than what was asked for by the origin server. If `example.com` for example stops supporting HTTPS at its expiry time, curl might then fail to access `http://example.com` until the (wrongly set) timeout expires. This bug can also expire the parent's entry *earlier*, thus making curl inadvertently switch back to insecure HTTP earlier than otherwise intended.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1086804

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
curl (PTS)bullseye7.74.0-1.3+deb11u13vulnerable
bullseye (security)7.74.0-1.3+deb11u14vulnerable
bookworm7.88.1-10+deb12u8vulnerable
bookworm (security)7.88.1-10+deb12u5vulnerable
sid, trixie8.11.0-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
curlsource(unstable)8.11.0-11086804

Notes

[bookworm] - curl <no-dsa> (Minor issue)
[bullseye] - curl <ignored> (curl is not built with HSTS support)
https://curl.se/docs/CVE-2024-9681.html
Introduced by: https://github.com/curl/curl/commit/7385610d0c74c6a254fea5e4cd6e1d559d848c8c (curl-7_74_0)
Fixed by: https://github.com/curl/curl/commit/a94973805df96269bf3f3bf0a20ccb9887313316 (curl-8_11_0)

Search for package or bug name: Reporting problems