Summary
Ein Angreifer kann mehrere Schwachstellen in OpenBSD ausnutzen, um nicht näher spezifizierte Auswirkungen zu erreichen, darunter möglicherweise die Ausführung von beliebigem Code, die Umgehung von Sicherheitsmaßnahmen, die Manipulation von Daten oder die Auslösung eines Denial-of-Service-Angriffs.
Product
OpenBSD ist ein Unix-artiges Betriebssystem, abgeleitet von BSD-Unix.
Vulnerabilities 4
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High 8.7
Stack overwrite from specially formatted base64 RDATA field
When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes. This enables attackers to overwrite the stack with up to 64K of attacker controlled data. Zone files which are written out by NSD itself, su…
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High 8.7
Stack overwrite from a specially crafted and formatted SVCB or HTTPS RR
When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data of unlimited size. Zone files which are written out by NSD…
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High 8.7
Stack overwrite from a specially crafted and formatted HIP RR
A HIP resource record that fills the RDATA near or at is limit, and has another dname RDATA field (a HIP Rendezvous server) can overwrite the stack with up to 191 bytes of attacker controlled data. Zone files which are written out by NSD itself, such as for z…
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High 8.7
Stack overwrite from specially formatted TXT-DATA RDATA field
Tokens of text in RDATA (of for example TXT records) under 32 bytes are not checked to stay within the space reserved for the RDATA allowing for arbitrary sized out of bound stack writes, including an overwrite of a callback function pointer which is called d…
Revision history
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#1
Initiale Fassung
References
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OpenBSD Security Advisory vom 2026-10-19
https://www.openbsd.org/errata78.html
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OpenBSD Security Advisory vom 2026-10-19
https://www.openbsd.org/errata79.html
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OpenBSD Security Advisory vom 2026-10-19
https://www.openbsd.org/errata80.html