Date: Fri, 31 Jul 2020 16:03:35 +0200 From: Matthieu Herrb <matthieu@...rb.eu> To: oss-security@...ts.openwall.com Subject: Fwd: X.Org security advisory: July 31, 2020: libX11 ----- Forwarded message from Matthieu Herrb <matthieu@...rb.eu> ----- Date: Fri, 31 Jul 2020 15:37:55 +0200 From: Matthieu Herrb <matthieu@...rb.eu> To: xorg-announce@...ts.x.org Cc: xorg-devel@...ts.x.org Subject: X.Org security advisory: July 31, 2020: libX11 X.Org security advisory: July 31, 2020 Heap corruption in the X input method client in libX11 ====================================================== CVE-2020-14344 The X Input Method (XIM) client implementation in libX11 has some integer overflows and signed/unsigned comparison issues that can lead to heap corruption when handling malformed messages from an input method. Patches ======= Patches for these issues have been commited to the libX11 git repository. libX11 1.6.10 will be released shortly and will include those patches. https://gitlab.freedesktop.org/xorg/lib/libx11 commit 1703b9f3435079d3c6021e1ee2ec34fd4978103d (HEAD -> master) Change the data_len parameter of _XimAttributeToValue() to CARD16 It's coming from a length in the protocol (unsigned) and passed to functions that expect unsigned int parameters (_XCopyToArg() and memcpy()). commit 1a566c9e00e5f35c1f9e7f3d741a02e5170852b2 Zero out buffers in functions It looks like uninitialized stack or heap memory can leak out via padding bytes. commit 2fcfcc49f3b1be854bb9085993a01d17c62acf60 Fix more unchecked lengths commit 388b303c62aa35a245f1704211a023440ad2c488 fix integer overflows in _XimAttributeToValue() commit 0e6561efcfaa0ae7b5c74eac7e064b76d687544e Fix signed length values in _XimGetAttributeID() The lengths are unsigned according to the specification. Passing negative values can lead to data corruption. Thanks ====== X.Org thanks Todd Carson for reporting these issues to our security team and assisting them in understanding them and providing fixes. -- Matthieu Herrb _______________________________________________ xorg-announce mailing list xorg-announce@...ts.x.org https://lists.x.org/mailman/listinfo/xorg-announce ----- End forwarded message ----- Download attachment "signature.asc" of type "application/pgp-signature" (794 bytes)
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