CVE-2019-3822

NameCVE-2019-3822
Descriptionlibcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1672-1, DSA-4386-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
curl (PTS)jessie, jessie (lts)7.38.0-4+deb8u28fixed
stretch (security)7.52.1-5+deb9u16fixed
stretch (lts), stretch7.52.1-5+deb9u22fixed
buster, buster (lts)7.64.0-4+deb10u10fixed
buster (security)7.64.0-4+deb10u9fixed
bullseye7.74.0-1.3+deb11u13fixed
bullseye (security)7.74.0-1.3+deb11u14fixed
bookworm7.88.1-10+deb12u8fixed
bookworm (security)7.88.1-10+deb12u5fixed
sid, trixie8.11.1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
curlsourcewheezy(not affected)
curlsourcejessie7.38.0-4+deb8u14DLA-1672-1
curlsourcestretch7.52.1-5+deb9u9DSA-4386-1
curlsource(unstable)7.64.0-1

Notes

https://curl.haxx.se/docs/CVE-2019-3822.html
Fixed by: https://github.com/curl/curl/commit/50c9484278c63b958655a717844f0721263939cc
Introduced by: https://github.com/curl/curl/commit/86724581b6c02d160b52f817550cfdfc9c93af62
[wheezy] - curl <not-affected> (Vulnerabe code not present)

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