Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: macsec: fix replay protection at XPN lower-PN wrap In macsec_post_decrypt(), when pn is U32_MAX, pn + 1 overflows u32 to 0 and the first branch never fires. If next_pn_halves.lower is also in the upper half, pn_same_half(pn, lower) is true and the XPN else-if does not fire either, leaving next_pn_halves unchanged. An attacker that captures the legitimate frame carrying pn == 0xFFFFFFFF on an XPN association can then replay it indefinitely, since lowest_pn never rises above the captured pn and macsec_decrypt() reconstructs the same IV. Extend the XPN else-if to also fire when pn + 1 wraps to 0, so receipt of pn == U32_MAX advances next_pn_halves to (upper + 1, 0).
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a21ecf0e033807b976967286e6c392f48ee2049f before dd7306779c6ce1238f4cdc34f3c1f2246b854457; affected a21ecf0e033807b976967286e6c392f48ee2049f before d15130461df388136b62a7b0ce9f66e7e2fa9ff1; affected a21ecf0e033807b976967286e6c392f48ee2049f before 23c0e230eab397d7f68be2538790ac41d3bb91fd; affected a21ecf0e033807b976967286e6c392f48ee2049f before 679e13a65e68a67c8b3c0467c02ee89157ec6f0f; affected a21ecf0e033807b976967286e6c392f48ee2049f before 79495a1b0944fe31ffd54b54b00211b493590d62; affected a21ecf0e033807b976967286e6c392f48ee2049f before 6d00f5c7e5ff7ec4795b7f5f8ed88bd346641652; affected a21ecf0e033807b976967286e6c392f48ee2049f before d55acbe577db892b60547b6ef1c020b359331a6d; affected a21ecf0e033807b976967286e6c392f48ee2049f before e68842b3356471ba56c882209f324613dac47f64 |
| Linux / Linux | affected 5.7; unaffected 0 before 5.7; unaffected 5.10.259 through 5.10.*; unaffected 5.15.210 through 5.15.*; unaffected 6.1.176 through 6.1.*; unaffected 6.6.143 through 6.6.*; unaffected 6.12.93 through 6.12.*; unaffected 6.18.35 through 6.18.*; unaffected 7.0.12 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/dd7306779c6ce1238f4cdc34f3c1f2246b854457
- https://git.kernel.org/stable/c/d15130461df388136b62a7b0ce9f66e7e2fa9ff1
- https://git.kernel.org/stable/c/23c0e230eab397d7f68be2538790ac41d3bb91fd
- https://git.kernel.org/stable/c/679e13a65e68a67c8b3c0467c02ee89157ec6f0f
- https://git.kernel.org/stable/c/79495a1b0944fe31ffd54b54b00211b493590d62
- https://git.kernel.org/stable/c/6d00f5c7e5ff7ec4795b7f5f8ed88bd346641652
- https://git.kernel.org/stable/c/d55acbe577db892b60547b6ef1c020b359331a6d
- https://git.kernel.org/stable/c/e68842b3356471ba56c882209f324613dac47f64
ADP enrichment
No English description supplied.
No references supplied.