CVE-2018-1000159

NameCVE-2018-1000159
Descriptiontlslite-ng version 0.7.3 and earlier, since commit d7b288316bca7bcdd082e6ccff5491e241305233 contains a CWE-354: Improper Validation of Integrity Check Value vulnerability in TLS implementation, tlslite/utils/constanttime.py: ct_check_cbc_mac_and_pad(); line "end_pos = data_len - 1 - mac.digest_size" that can result in an attacker manipulating the TLS ciphertext which will not be detected by receiving tlslite-ng. This attack appears to be exploitable via man in the middle on a network connection. This vulnerability appears to have been fixed after commit 3674815d1b0f7484454995e2737a352e0a6a93d8.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
Debian Bugs895728

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
tlslite-ng (PTS)stretch0.6.0-1+deb9u1fixed
buster0.7.5-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
tlslite-ngsourcestretch0.6.0-1+deb9u1
tlslite-ngsource(unstable)0.7.4-1low895728

Notes

https://github.com/tomato42/tlslite-ng/pull/234
https://github.com/tomato42/tlslite-ng/pull/234/commits/3674815d1b0f7484454995e2737a352e0a6a93d8 (v0.8.0-alpha3)
https://github.com/tomato42/tlslite-ng/pull/235
https://github.com/tomato42/tlslite-ng/pull/235/commits/e5e9145558f4c1a81071c61c947aa55a52542585 (backport for tslite-ng-0.7)

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