tlslite-ng off-by-one error on mac checking

MEDIO 5.9CVE-2018-1000159 · GHSA-cwh5-3cw7-4286 · PYSEC-2018-31 · Published 18/04/2018 · updated 17/06/2026

In breve

CVE-2018-1000159 è una vulnerabilità MEDIO (CVSS 5.9) che riguarda tlslite-ng, tlslite-ng (tlslite-ng project).
Probabilità di sfruttamento nei prossimi 30 giorni (EPSS): 0.77%, superiore al 55.9% delle vulnerabilità.
Correzione: aggiornare a 0.7.4 o successiva.

Package	Affected versions	Patched versions
tlslite-ng PyPI	`< 0.7.4`	`0.7.4`
tlslite-ng tlslite-ng_project	`≤ 0.7.3`	No fix yet

Description

tlslite-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.

NVD description

tlslite-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.

References

nvd.nist.gov/vuln/detail/CVE-2018-1000159 · ADVISORY
tlsfuzzer/tlslite-ng#234 · WEB
tomato42/tlslite-ng#234 · WEB
tlsfuzzer/tlslite-ng commit d7b2883 · WEB
pypa/advisory-database · WEB
tomato42/tlslite-ng · PACKAGE
GitHub Advisory GHSA-cwh5-3cw7-4286 · ADVISORY

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Package

Affected versions

Patched versions

tlslite-ng

PyPI

< 0.7.4

0.7.4

tlslite-ng

tlslite-ng_project

≤ 0.7.3

No fix yet

Description

NVD description

tlslite-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.