Affected: Alpaquita:25: gnupg, Alpaquita:stream: gnupg

In GnuPG through 2.4.8, if a signed message has \f at the end of a plaintext line, an adversary can construct a modified message that places additional text after the signed material, such that signature verification of the modified message succeeds (although an "invalid armor" message is printed during verification). This is related to use of \f as a marker to denote truncation of a long plaintext line.

In GnuPG through 2.4.8, if a signed message has \f at the end of a plaintext line, an adversary can construct a modified message that places additional text after the signed material, such that signature verification of the modified message succeeds (although an "invalid armor" message is printed during verification). This is related to use of \f as a marker to denote truncation of a long plaintext line.

gnupg: GnuPG: Signature bypass via form feed character in signed messages

Withdrawn by the publisher.

Affected: Ubuntu:Pro:16.04:LTS: gnupg2, Ubuntu:Pro:18.04:LTS: gnupg2, Ubuntu:Pro:20.04:LTS: gnupg2, Ubuntu:22.04:LTS: gnupg2, Ubuntu:24.04:LTS: gnupg2, Ubuntu:25.10: gnupg2

In GnuPG through 2.4.8, if a signed message has \f at the end of a plaintext line, an adversary can construct a modified message that places additional text after the signed material, such that signature verification of the modified message succeeds (although an "invalid armor" message is printed during verification). This is related to use of \f as a marker to denote truncation of a long plaintext line.

Ein lokaler Angreifer kann mehrere Schwachstellen in GnuPG ausnutzen, um Sicherheitsvorkehrungen zu umgehen und weitere, nicht spezifizierte Auswirkungen zu verursachen.