In numbers.c in libxslt 1.1.33, an xsl:number with certain format strings could lead to a uninitialized read in xsltNumberFormatInsertNumbers. This could allow an attacker to discern whether a byte on the stack contains the characters A, a, I, i, or 0, or any other character.
Weakness
The product uses or accesses a resource that has not been initialized.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libxslt | Xmlsoft | 1.1.33 (including) | 1.1.33 (including) |
| Libxslt | Ubuntu | bionic | * |
| Libxslt | Ubuntu | cosmic | * |
| Libxslt | Ubuntu | disco | * |
| Libxslt | Ubuntu | esm-infra-legacy/trusty | * |
| Libxslt | Ubuntu | esm-infra/bionic | * |
| Libxslt | Ubuntu | esm-infra/xenial | * |
| Libxslt | Ubuntu | trusty | * |
| Libxslt | Ubuntu | trusty/esm | * |
| Libxslt | Ubuntu | xenial | * |
Potential Mitigations
References
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00062.html
- http://www.openwall.com/lists/oss-security/2019/11/17/2
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14471
- https://gitlab.gnome.org/GNOME/libxslt/commit/c5eb6cf3aba0af048596106ed839b4ae17ecbcb1
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2019/07/msg00020.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IOYJKXPQCUNBMMQJWYXOR6QRUJZHEDRZ/
- https://oss-fuzz.com/testcase-detail/5631739747106816
- https://security.netapp.com/advisory/ntap-20190806-0004/
- https://security.netapp.com/advisory/ntap-20200122-0003/
- https://usn.ubuntu.com/4164-1/
- https://www.oracle.com/security-alerts/cpujan2020.html
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00062.html
- http://www.openwall.com/lists/oss-security/2019/11/17/2
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14471
- https://gitlab.gnome.org/GNOME/libxslt/commit/c5eb6cf3aba0af048596106ed839b4ae17ecbcb1
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2019/07/msg00020.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IOYJKXPQCUNBMMQJWYXOR6QRUJZHEDRZ/
- https://oss-fuzz.com/testcase-detail/5631739747106816
- https://security.netapp.com/advisory/ntap-20190806-0004/
- https://security.netapp.com/advisory/ntap-20200122-0003/
- https://usn.ubuntu.com/4164-1/
- https://www.oracle.com/security-alerts/cpujan2020.html