9.8 CRITICAL
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): High (H)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): High (H)
Activity log
- Created & dismissed (max. allowed matches exceeded) suggestion
net: tls: prevent chain-after-chain in plain text SG
In the Linux kernel, the following vulnerability has been resolved: net: tls: prevent chain-after-chain in plain text SG Sashiko points out that if end = 0 (start != 0) the current code will create a chain link to content type right after the wrap link: This would create a chain where the wrap link points directly to another chain link. The scatterlist API sg_next iterator does not recursively resolve consecutive chain links. meaning this is illegal input to crypto. The wrapping link is unnecessary if end = 0. end is the entry after the last one used so end = 0 means there's nothing pushed after the wrap: end start i v v v [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap] Skip the wrapping in this case. TLS 1.3 can use the "wrapping slot" for it's chaining if end = 0. This avoids the chain-after-chain. Move the wrap chaining before marking END and chaining off content type, that feels like more logical ordering to me, but should not matter from functional perspective.
References
Affected products
- =<6.1.*
- =<5.15.*
- =<5.10.*
- =<7.0.*
- <acdc12b71c9aa4be5dcd2c8062753c6d2033e235
- <929b1548e63ac72e104c07d8ee8cbbeeba2fa89a
- <410351158dfef2d67fea6603680b3a6013c6ed9d
- <49a5faaa471ddcd37b6893970c9916eb836e7c31
- <5.5
- =<6.6.*
- <5.5
- <ff26a0e8377dec07e4a7230db7675bed1b9a6d03
- ==d529d6c9f7e3aaeac13c4948f79799ccb825f29d
- ==5.5
- <91359966e247c0244c66d50bbb8e74aefa4321c3
- =<6.18.*
- <af855f4c966afafef74faf8390c7b86568c0d46d
- =<6.12.*
- =<*
- <b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36